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  1. AU="Pedaletti, G."
  2. AU="Oliveira, Cleide Dantas"
  3. AU="Zelcer, Noam"
  4. AU="Appleton, Noa"
  5. AU="Rashid, Rijwana"
  6. AU="Luther-Tontasse, Emma"
  7. AU="Zohoori, Namvar"
  8. AU=Rosensweig Clark
  9. AU="Leff, Jonathan D"
  10. AU="Akira Goto"
  11. AU="Javier Pizarro-Cerda"
  12. AU="Oakley, James V"
  13. AU="Wen, Teresa H"
  14. AU="Li, Huiyu"
  15. AU="Pannala, Ananth S"
  16. AU="Noda, K."
  17. AU="Almeida, Carolina Aparecida Faria"
  18. AU=Khoshakhlagh Arezou
  19. AU="Sofija Glamočlija"
  20. AU="Fleming, Sherry D"
  21. AU="Minkina, Tatiana M"
  22. AU="Fonseca, Danielle"
  23. AU="Maximilian, Carmen-Rodica"
  24. AU="Heuer, Lauren B"
  25. AU="Pan, Judy"
  26. AU="Doro, M."
  27. AU="Navarro-Zapata, Alfonso"
  28. AU="Martin, Emanuel H"
  29. AU="Biswas, Arnab"
  30. AU="Kurt Pfister"
  31. AU="Stefano Brignola"
  32. AU="Nierzwicki, Łukasz"
  33. AU="Benvin, Iva"
  34. AU="Sardesai, S. C."
  35. AU="Aldrees, Rana"

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  1. Buch ; Dissertation / Habilitation: Very high energy emission from passive supermassive black holes

    Pedaletti, Giovanna

    2009  

    Verfasserangabe [put forward by Giovanna Pedaletti]
    Sprache Englisch
    Umfang III, 96 S., graph. Darst.
    Dokumenttyp Buch ; Dissertation / Habilitation
    Dissertation / Habilitation Univ., Diss.--Heidelberg, 2009
    Datenquelle Katalog der Technische Informationsbibliothek Hannover

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  2. Buch ; Online ; Dissertation / Habilitation: Very high energy emission from passive supermassive black holes

    Pedaletti, Giovanna

    2009  

    Abstract: The H.E.S.S. experiment, an array of four Imaging Cherenkov Telescopes, widened the horizon of Very High Energy (VHE) astronomy. Its unprecedented sensitivity is well suited for the study of new classes of expected VHE emitters, such as passive galactic ... ...

    Titelvarianten Hochenergetische Gamma-Strahlung von passiven supermassereichen Schwarzen Löchern
    Verfasserangabe Giovanna Pedaletti
    Abstract The H.E.S.S. experiment, an array of four Imaging Cherenkov Telescopes, widened the horizon of Very High Energy (VHE) astronomy. Its unprecedented sensitivity is well suited for the study of new classes of expected VHE emitters, such as passive galactic nuclei that are the main focus of the work presented in this thesis. Acceleration of particles up to Ultra High Energies is expected in the magnetosphere of supermassive black holes (SMBH). The radiation losses of these accelerated particles are expected to reach the VHE regime in which H.E.S.S. operates. Predicted fluxes exceed the sensitivity of the array. However, strong photon fields in the surrounding of the acceleration region might absorb the produced radiation. Therefore observations focus on those galactic nuclei that are underluminous at lower photon energies. This work presents data collected by the H.E.S.S. telescopes on the test candidate NGC 1399 and their interpretation. While no detection has been achieved, important constraints can be derived from the obtained upper limits on the maximum energy attainable by the accelerated particles and on the magnetic field strength in the acceleration region. A limit on the magnetic field of B<74 Gauss is given. The limit is model dependent and a scaling of the result with the assumptions is given. This is the tightest empirical constraint to date. Because of the lack of signal from the test candidate, a stacking analysis has been performed on similar sources in three cluster fields.A search for signal from classes of active galactic nuclei has also been made in the same three fields. None of the analyzed samples revealed a significant signal.Also presented are the expectations for the next generation of Cherenkov Telescopes and an outlook on the relativistic effects expected on the VHE emission close to SMBH.
    Sprache Englisch
    Umfang Online-Ressource (120 S.; 4,47 MB)
    Dokumenttyp Buch ; Online ; Dissertation / Habilitation
    Dissertation / Habilitation Univ., Diss--Heidelberg, 2009
    Anmerkung Online publiziert: 2009
    Datenquelle Katalog der Technische Informationsbibliothek Hannover

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  3. Buch ; Online: Progress in Monte Carlo design and optimization of the Cherenkov Telescope Array

    Bernlöhr, K. / Barnacka, A. / Becherini, Y. / Bigas, O. Blanch / Bouvier, A. / Carmona, E. / Colin, P. / Decerprit, G. / Di Pierro, F. / Dubois, F. / Farnier, C. / Funk, S. / Hermann, G. / Hinton, J. A. / Humensky, T. B. / Jogler, T. / Khélifi, B. / Kihm, T. / Komin, N. /
    Lenain, J. -P. / López-Coto, R. / Maier, G. / Mazin, D. / Medina, M. C. / Moralejo, A. / Moderski, R. / Nolan, S. J. / Ohm, S. / Wilhelmi, E. de Oña / Parsons, R. D. / Arribas, M. Paz / Pedaletti, G. / Pita, S. / Prokoph, H. / Rulten, C. B. / Schwanke, U. / Shayduk, M. / Stamatescu, V. / Vallania, P. / Vorobiov, S. / Wischnewski, R. / Wood, M. / Yoshikoshi, T. / Zech, A.

    2013  

    Abstract: The Cherenkov Telescope Array (CTA) will be an instrument covering a wide energy range in very-high-energy (VHE) gamma rays. CTA will include several types of telescopes, in order to optimize the performance over the whole energy range. Both large-scale ... ...

    Abstract The Cherenkov Telescope Array (CTA) will be an instrument covering a wide energy range in very-high-energy (VHE) gamma rays. CTA will include several types of telescopes, in order to optimize the performance over the whole energy range. Both large-scale Monte Carlo (MC) simulations of CTA super-sets (including many different possible CTA layouts as sub-sets) and smaller-scale simulations dedicated to individual aspects were carried out and are on-going. We summarize results of the prior round of large-scale simulations, show where the design has now evolved beyond the conservative assumptions of the prior round and present first results from the on-going new round of MC simulations.

    Comment: 4 pages, 5 figures. In Proceedings of the 33rd International Cosmic Ray Conference (ICRC2013), Rio de Janeiro (Brazil). All CTA contributions at arXiv:1307.2232
    Schlagwörter Astrophysics - Instrumentation and Methods for Astrophysics
    Thema/Rubrik (Code) 612
    Erscheinungsdatum 2013-07-10
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

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  4. Buch ; Online: Limits on the flux of tau neutrinos from 1 PeV to 3 EeV with the MAGIC telescopes

    MAGIC Collaboration / Ahnen, M. L. / Ansoldi, S. / Antonelli, L. A. / Arcaro, C. / Baack, D. / Babić, A. / Banerjee, B. / Bangale, P. / de Almeida, U. Barres / Barrio, J. A. / González, J. Becerra / Bednarek, W. / Bernardini, E. / Berse, R. Ch. / Berti, A. / Bhattacharyya, W. / Biland, A. / Blanch, O. /
    Bonnoli, G. / Carosi, R. / Carosi, A. / Ceribella, G. / Chatterjee, A. / Colak, S. M. / Colin, P. / Colombo, E. / Contreras, J. L. / Cortina, J. / Covino, S. / Cumani, P. / Da Vela, P. / Dazzi, F. / De Angelis, A. / De Lotto, B. / Delfino, M. / Delgado, J. / Di Pierro, F. / Domínguez, A. / Prester, D. Dominis / Dorner, D. / Doro, M. / Einecke, S. / Elsaesser, D. / Ramazani, V. Fallah / Fernández-Barral, A. / Fidalgo, D. / Fonseca, M. V. / Font, L. / Fruck, C. / Galindo, D. / López, R. J. García / Garczarczyk, M. / Gaug, M. / Giammaria, P. / Godinović, N. / Góra, D. / Guberman, D. / Hadasch, D. / Hahn, A. / Hassan, T. / Hayashida, M. / Herrera, J. / Hose, J. / Hrupec, D. / Ishio, K. / Konno, Y. / Kubo, H. / Kushida, J. / Kuveždić, D. / Lelas, D. / Lindfors, E. / Lombardi, S. / Longo, F. / López, M. / Maggio, C. / Majumdar, P. / Makariev, M. / Maneva, G. / Manganaro, M. / Mannheim, K. / Maraschi, L. / Mariotti, M. / Martínez, M. / Masuda, S. / Mazin, D. / Mielke, K. / Minev, M. / Miranda, J. M. / Mirzoyan, R. / Moralejo, A. / Moreno, V. / Moretti, E. / Nagayoshi, T. / Neustroev, V. / Niedzwiecki, A. / Rosillo, M. Nievas / Nigro, C. / Nilsson, K. / Ninci, D. / Nishijima, K. / Noda, K. / Nogués, L. / Paiano, S. / Palacio, J. / Paneque, D. / Paoletti, R. / Paredes, J. M. / Pedaletti, G. / Peresano, M. / Persic, M. / Moroni, P. G. Prada / Prandini, E. / Puljak, I. / Garcia, J. R. / Reichardt, I. / Rhode, W. / Ribó, M. / Rico, J. / Righi, C. / Rugliancich, A. / Saito, T. / Satalecka, K. / Schweizer, T. / Sitarek, J. / Šnidarić, I. / Sobczynska, D. / Stamerra, A. / Strzys, M. / Surić, T. / Takahashi, M. / Takalo, L. / Tavecchio, F. / Temnikov, P. / Terzić, T. / Teshima, M. / Torres-Albà, N. / Treves, A. / Tsujimoto, S. / Vanzo, G. / Acosta, M. Vazquez / Vovk, I. / Ward, J. E. / Will, M. / Zarić, D.

    2018  

    Abstract: A search for tau neutrino induced showers with the MAGIC telescopes is presented. The MAGIC telescopes located at an altitude of 2200 m a.s.l. in the Canary Island of La Palma, can point towards the horizon or a few degrees below across an azimuthal ... ...

    Abstract A search for tau neutrino induced showers with the MAGIC telescopes is presented. The MAGIC telescopes located at an altitude of 2200 m a.s.l. in the Canary Island of La Palma, can point towards the horizon or a few degrees below across an azimuthal range of about 80 degrees. This provides a possibility to search for air showers induced by tau leptons arising from interactions of tau neutrinos in the Earth crust or the surrounding ocean. In this paper we show how such air showers can be discriminated from the background of very inclined hadronic showers by using Monte Carlo simulations. Taking into account the orography of the site, the point source acceptance and the event rates expected have been calculated for a sample of generic neutrino fluxes from photo-hadronic interactions in AGNs. The analysis of about 30 hours of data taken towards the sealeads to a 90\% C.L. point source limit for tau neutrinos in the energy range from $1.0 \times 10^{15}$ eV to $3.0 \times 10^{18}$ eV of about $E_{\nu_{\tau}}^{2}\times \phi (E_{\nu_{\tau}}) < 2.0 \times 10^{-4}$ GeV cm$^{-2}$ s$^{-1}$ for an assumed power-law neutrino spectrum with spectral index $\gamma$=-2. However, with 300 hours and in case of an optimistic neutrino flare model, limits of the level down to $E_{\nu_{\tau}}^{2}\times \phi (E_{\nu_{\tau}}) < 8.4 \times 10^{-6}$ GeV cm$^{-2}$ s$^{-1}$ can be expected.

    Comment: accepted for publication in Astroparticle Physics
    Schlagwörter Astrophysics - Instrumentation and Methods for Astrophysics ; Astrophysics - High Energy Astrophysical Phenomena
    Thema/Rubrik (Code) 612
    Erscheinungsdatum 2018-05-07
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

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  5. Artikel ; Online: Search for a dark matter annihilation signal from the galactic center halo with H.E.S.S.

    Abramowski, A / Acero, F / Aharonian, F / Akhperjanian, A G / Anton, G / Barnacka, A / de Almeida, U Barres / Bazer-Bachi, A R / Becherini, Y / Becker, J / Behera, B / Bernlöhr, K / Bochow, A / Boisson, C / Bolmont, J / Bordas, P / Borrel, V / Brucker, J / Brun, F /
    Brun, P / Bulik, T / Büsching, I / Carrigan, S / Casanova, S / Cerruti, M / Chadwick, P M / Charbonnier, A / Chaves, R C G / Cheesebrough, A / Chounet, L-M / Clapson, A C / Coignet, G / Conrad, J / Dalton, M / Daniel, M K / Davids, I D / Degrange, B / Deil, C / Dickinson, H J / Djannati-Ataï, A / Domainko, W / Drury, L O'C / Dubois, F / Dubus, G / Dyks, J / Dyrda, M / Egberts, K / Eger, P / Espigat, P / Fallon, L / Farnier, C / Fegan, S / Feinstein, F / Fernandes, M V / Fiasson, A / Fontaine, G / Förster, A / Füssling, M / Gallant, Y A / Gast, H / Gérard, L / Gerbig, D / Giebels, B / Glicenstein, J F / Glück, B / Goret, P / Göring, D / Hague, J D / Hampf, D / Hauser, M / Heinz, S / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J A / Hoffmann, A / Hofmann, W / Hofverberg, P / Horns, D / Jacholkowska, A / de Jager, O C / Jahn, C / Jamrozy, M / Jung, I / Kastendieck, M A / Katarzyński, K / Katz, U / Kaufmann, S / Keogh, D / Kerschhaggl, M / Khangulyan, D / Khélifi, B / Klochkov, D / Kluźniak, W / Kneiske, T / Komin, Nu / Kosack, K / Kossakowski, R / Laffon, H / Lamanna, G / Lennarz, D / Lohse, T / Lopatin, A / Lu, C-C / Marandon, V / Marcowith, A / Masbou, J / Maurin, D / Maxted, N / McComb, T J L / Medina, M C / Méhault, J / Moderski, R / Moulin, E / Naumann, C L / Naumann-Godo, M / de Naurois, M / Nedbal, D / Nekrassov, D / Nguyen, N / Nicholas, B / Niemiec, J / Nolan, S J / Ohm, S / Olive, J-F / Wilhelmi, E de Oña / Opitz, B / Ostrowski, M / Panter, M / Arribas, M Paz / Pedaletti, G / Pelletier, G / Petrucci, P-O / Pita, S / Pühlhofer, G / Punch, M / Quirrenbach, A / Raue, M / Rayner, S M / Reimer, A / Reimer, O / Renaud, M / de los Reyes, R / Rieger, F / Ripken, J / Rob, L / Rosier-Lees, S / Rowell, G / Rudak, B / Rulten, C B / Ruppel, J / Ryde, F / Sahakian, V / Santangelo, A / Schlickeiser, R / Schöck, F M / Schönwald, A / Schwanke, U / Schwarzburg, S / Schwemmer, S / Shalchi, A / Sikora, M / Skilton, J L / Sol, H / Spengler, G / Stawarz, Ł / Steenkamp, R / Stegmann, C / Stinzing, F / Sushch, I / Szostek, A / Tavernet, J-P / Terrier, R / Tibolla, O / Tluczykont, M / Valerius, K / van Eldik, C / Vasileiadis, G / Venter, C / Vialle, J P / Viana, A / Vincent, P / Vivier, M / Völk, H J / Volpe, F / Vorobiov, S / Vorster, M / Wagner, S J / Ward, M / Wierzcholska, A / Zajczyk, A / Zdziarski, A A / Zech, A / Zechlin, H-S

    Physical review letters

    2011  Band 106, Heft 16, Seite(n) 161301

    Abstract: A search for a very-high-energy (VHE; ≥100  GeV) γ-ray signal from self-annihilating particle dark matter (DM) is performed towards a region of projected distance r∼45-150  pc from the Galactic center. The background-subtracted γ-ray spectrum measured ... ...

    Abstract A search for a very-high-energy (VHE; ≥100  GeV) γ-ray signal from self-annihilating particle dark matter (DM) is performed towards a region of projected distance r∼45-150  pc from the Galactic center. The background-subtracted γ-ray spectrum measured with the High Energy Stereoscopic System (H.E.S.S.) γ-ray instrument in the energy range between 300 GeV and 30 TeV shows no hint of a residual γ-ray flux. Assuming conventional Navarro-Frenk-White and Einasto density profiles, limits are derived on the velocity-weighted annihilation cross section (σv) as a function of the DM particle mass. These are among the best reported so far for this energy range and in particular differ only little between the chosen density profile parametrizations. In particular, for the DM particle mass of ∼1  TeV, values for (σv) above 3×10(-25)  cm(3) s(-1) are excluded for the Einasto density profile.
    Sprache Englisch
    Erscheinungsdatum 2011-04-22
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.106.161301
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  6. Artikel ; Online: Detection of gamma rays from a starburst galaxy.

    Acero, F / Aharonian, F / Akhperjanian, A G / Anton, G / Barres de Almeida, U / Bazer-Bachi, A R / Becherini, Y / Behera, B / Bernlöhr, K / Bochow, A / Boisson, C / Bolmont, J / Borrel, V / Brucker, J / Brun, F / Brun, P / Bühler, R / Bulik, T / Büsching, I /
    Boutelier, T / Chadwick, P M / Charbonnier, A / Chaves, R C G / Cheesebrough, A / Chounet, L-M / Clapson, A C / Coignet, G / Dalton, M / Daniel, M K / Davids, I D / Degrange, B / Deil, C / Dickinson, H J / Djannati-Ataï, A / Domainko, W / Drury, L O'C / Dubois, F / Dubus, G / Dyks, J / Dyrda, M / Egberts, K / Emmanoulopoulos, D / Espigat, P / Farnier, C / Fegan, S / Feinstein, F / Fiasson, A / Förster, A / Fontaine, G / Füssling, M / Gabici, S / Gallant, Y A / Gérard, L / Gerbig, D / Giebels, B / Glicenstein, J F / Glück, B / Goret, P / Göring, D / Hauser, D / Hauser, M / Heinz, S / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J A / Hoffmann, A / Hofmann, W / Hofverberg, P / Hoppe, S / Horns, D / Jacholkowska, A / de Jager, O C / Jahn, C / Jung, I / Katarzyński, K / Katz, U / Kaufmann, S / Kerschhaggl, M / Khangulyan, D / Khélifi, B / Keogh, D / Klochkov, D / Kluźniak, W / Kneiske, T / Komin, Nu / Kosack, K / Kossakowski, R / Lamanna, G / Lenain, J-P / Lohse, T / Marandon, V / Martineau-Huynh, O / Marcowith, A / Masbou, J / Maurin, D / McComb, T J L / Medina, M C / Méhault, J / Moderski, R / Moulin, E / Naumann-Godo, M / de Naurois, M / Nedbal, D / Nekrassov, D / Nicholas, B / Niemiec, J / Nolan, S J / Ohm, S / Olive, J-F / de Oña Wilhelmi, E / Orford, K J / Ostrowski, M / Panter, M / Paz Arribas, M / Pedaletti, G / Pelletier, G / Petrucci, P-O / Pita, S / Pühlhofer, G / Punch, M / Quirrenbach, A / Raubenheimer, B C / Raue, M / Rayner, S M / Reimer, O / Renaud, M / Rieger, F / Ripken, J / Rob, L / Rosier-Lees, S / Rowell, G / Rudak, B / Rulten, C B / Ruppel, J / Sahakian, V / Santangelo, A / Schlickeiser, R / Schöck, F M / Schwanke, U / Schwarzburg, S / Schwemmer, S / Shalchi, A / Sikora, M / Skilton, J L / Sol, H / Stawarz, Ł / Steenkamp, R / Stegmann, C / Stinzing, F / Superina, G / Szostek, A / Tam, P H / Tavernet, J-P / Terrier, R / Tibolla, O / Tluczykont, M / van Eldik, C / Vasileiadis, G / Venter, C / Venter, L / Vialle, J P / Vincent, P / Vivier, M / Völk, H J / Volpe, F / Wagner, S J / Ward, M / Zdziarski, A A / Zech, A

    Science (New York, N.Y.)

    2009  Band 326, Heft 5956, Seite(n) 1080–1082

    Abstract: Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, the remnants of which are thought to accelerate energetic cosmic rays up to energies of approximately 10(15) electron volts. We report the detection of gamma rays-- ...

    Abstract Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, the remnants of which are thought to accelerate energetic cosmic rays up to energies of approximately 10(15) electron volts. We report the detection of gamma rays--tracers of such cosmic rays--from the starburst galaxy NGC 253 using the High Energy Stereoscopic System (H.E.S.S.) array of imaging atmospheric Cherenkov telescopes. The gamma-ray flux above 220 billion electron volts is F = (5.5 +/- 1.0(stat) +/- 2.8(sys)) x 10(-13) cm(-2) s(-1), implying a cosmic-ray density about three orders of magnitude larger than that in the center of the Milky Way. The fraction of cosmic-ray energy channeled into gamma rays in this starburst environment is five times as large as that in our Galaxy.
    Sprache Englisch
    Erscheinungsdatum 2009-11-20
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.1178826
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  7. Artikel: Energy spectrum of cosmic-ray electrons at TeV energies.

    Aharonian, F / Akhperjanian, A G / Barres de Almeida, U / Bazer-Bachi, A R / Becherini, Y / Behera, B / Benbow, W / Bernlöhr, K / Boisson, C / Bochow, A / Borrel, V / Braun, I / Brion, E / Brucker, J / Brun, P / Brucker, R / Bulik, T / Büsching, I / Boutelier, T /
    Carrigan, S / Chadwick, P M / Charbonnier, A / Chaves, R C G / Cheesebrough, A / Chounet, L M / Clapson, A C / Coignet, G / Costamante, L / Dalton, M / Degrange, B / Deil, C / Dickinson, H J / Djannati-Ataï, A / Domainko, W / Drury, L O'C / Dubois, F / Dubus, G / Dyks, J / Dyrda, M / Egberts, K / Emmanoulopoulos, D / Espigat, P / Farnier, C / Feinstein, F / Fiasson, A / Fontaine, G / Füsling, M / Gabici, S / Gallant, Y A / Gérard, L / Giebels, B / Glicenstein, J F / Glück, B / Goret, P / Hadjichristidis, C / Hauser, D / Hauser, M / Heinz, S / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J A / Hoffmann, A / Hofmann, W / Holleran, M / Hoppe, S / Horns, D / Jacholkowska, A / de Jager, O C / Jung, I / Katarzyński, K / Kaufmann, S / Kendziorra, E / Kerschhaggl, M / Khangulyan, D / Khélifi, B / Keogh, D / Komin, Nu / Kosack, K / Lamanna, G / Lenain, J P / Lohse, T / Marandon, V / Martin, J M / Martineau-Huynh, O / Marcowith, A / Maurin, D / McComb, T J L / Medina, C / Moderski, R / Moulin, E / Naumann-Godo, M / de Naurois, M / Nedbal, D / Nekrassov, D / Niemiec, J / Nolan, S J / Ohm, S / Olive, J F / de Oña Wilhelmi, E / Orford, K J / Osborne, J L / Ostrowski, M / Panter, M / Pedaletti, G / Pelletier, G / Petrucci, P O / Pita, S / Pühlhofer, G / Punch, M / Quirrenbach, A / Raubenheimer, B C / Raue, M / Rayner, S M / Renaud, M / Rieger, F / Ripken, J / Rob, L / Rosier-Lees, S / Rowell, G / Rudak, B / Rulten, C B / Ruppel, J / Sahakian, V / Santangelo, A / Schlickeiser, R / Schöck, F M / Schröder, R / Schwanke, U / Schwarzburg, S / Schwemmer, S / Shalchi, A / Skilton, J L / Sol, H / Spangler, D / Stawarz, Ł / Steenkamp, R / Stegmann, C / Superina, G / Tam, P H / Tavernet, J P / Terrier, R / Tibolla, O / van Eldik, C / Vasileiadis, G / Venter, C / Vialle, J P / Vincent, P / Vivier, M / Völk, H J / Volpe, F / Wagner, S J / Ward, M / Zdziarski, A A / Zech, A

    Physical review letters

    2008  Band 101, Heft 26, Seite(n) 261104

    Abstract: The very large collection area of ground-based gamma-ray telescopes gives them a substantial advantage over balloon or satellite based instruments in the detection of very-high-energy (>600 GeV) cosmic-ray electrons. Here we present the electron spectrum ...

    Abstract The very large collection area of ground-based gamma-ray telescopes gives them a substantial advantage over balloon or satellite based instruments in the detection of very-high-energy (>600 GeV) cosmic-ray electrons. Here we present the electron spectrum derived from data taken with the High Energy Stereoscopic System (H.E.S.S.) of imaging atmospheric Cherenkov telescopes. In this measurement, the first of this type, we are able to extend the measurement of the electron spectrum beyond the range accessible to direct measurements. We find evidence for a substantial steepening in the energy spectrum above 600 GeV compared to lower energies.
    Sprache Englisch
    Erscheinungsdatum 2008-12-31
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.101.261104
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  8. Artikel: Limits on an energy dependence of the speed of light from a flare of the active galaxy PKS 2155-304.

    Aharonian, F / Akhperjanian, A G / Barres de Almeida, U / Bazer-Bachi, A R / Becherini, Y / Behera, B / Beilicke, M / Benbow, W / Bernlöhr, K / Boisson, C / Bochow, A / Borrel, V / Braun, I / Brion, E / Brucker, J / Brun, P / Bühler, R / Bulik, T / Büsching, I /
    Boutelier, T / Carrigan, S / Chadwick, P M / Charbonnier, A / Chaves, R C G / Chounet, L-M / Clapson, A C / Coignet, G / Costamante, L / Dalton, M / Degrange, B / Deil, C / Dickinson, H J / Djannati-Ataï, A / Domainko, W / Drury, L O'C / Dubois, F / Dubus, G / Dyks, J / Egberts, K / Emmanoulopoulos, D / Espigat, P / Farnier, C / Feinstein, F / Fiasson, A / Förster, A / Fontaine, G / Füssling, M / Gabici, S / Gallant, Y A / Gérard, L / Giebels, B / Glicenstein, J F / Glück, B / Goret, P / Hadjichristidis, C / Hauser, D / Hauser, M / Heinz, S / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J A / Hoffmann, A / Hofmann, W / Holleran, M / Hoppe, S / Horns, D / Jacholkowska, A / de Jager, O C / Jung, I / Katarzyński, K / Kaufmann, S / Kendziorra, E / Kerschhaggl, M / Khangulyan, D / Khélifi, B / Keogh, D / Komin, Nu / Kosack, K / Lamanna, G / Lenain, J-P / Lohse, T / Marandon, V / Martin, J M / Martineau-Huynh, O / Marcowith, A / Maurin, D / McComb, T J L / Medina, C / Moderski, R / Moulin, E / Naumann-Godo, M / de Naurois, M / Nedbal, D / Nekrassov, D / Niemiec, J / Nolan, S J / Ohm, S / Olive, J-F / de Oña Wilhelmi, E / Orford, K J / Osborne, J L / Ostrowski, M / Panter, M / Pedaletti, G / Pelletier, G / Petrucci, P-O / Pita, S / Pühlhofer, G / Punch, M / Quirrenbach, A / Raubenheimer, B C / Raue, M / Rayner, S M / Renaud, M / Rieger, F / Ripken, J / Rob, L / Rosier-Lees, S / Rowell, G / Rudak, B / Ruppel, J / Sahakian, V / Santangelo, A / Schlickeiser, R / Schöck, F M / Schröder, R / Schwanke, U / Schwarzburg, S / Schwemmer, S / Shalchi, A / Skilton, J L / Sol, H / Spangler, D / Stawarz, Ł / Steenkamp, R / Stegmann, C / Superina, G / Tam, P H / Tavernet, J-P / Terrier, R / Tibolla, O / van Eldik, C / Vasileiadis, G / Venter, C / Vialle, J P / Vincent, P / Vivier, M / Völk, H J / Volpe, F / Wagner, S J / Ward, M / Zdziarski, A A / Zech, A

    Physical review letters

    2008  Band 101, Heft 17, Seite(n) 170402

    Abstract: In the past few decades, several models have predicted an energy dependence of the speed of light in the context of quantum gravity. For cosmological sources such as active galaxies, this minuscule effect can add up to measurable photon-energy dependent ... ...

    Abstract In the past few decades, several models have predicted an energy dependence of the speed of light in the context of quantum gravity. For cosmological sources such as active galaxies, this minuscule effect can add up to measurable photon-energy dependent time lags. In this Letter a search for such time lags during the High Energy Stereoscopic System observations of the exceptional very high energy flare of the active galaxy PKS 2155-304 on 28 July 2006 is presented. Since no significant time lag is found, lower limits on the energy scale of speed of light modifications are derived.
    Sprache Englisch
    Erscheinungsdatum 2008-10-24
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.101.170402
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  9. Artikel: Detection of Gamma Rays from a Starburst Galaxy

    Acero, F / Aharonian, F / Akhperjanian, A.G / Anton, G / Arribas, M. Paz / Bühler, R / Büsching, I / Barres de Almeida, U / Bazer-Bachi, A.R / Becherini, Y / Behera, B / Bernlöhr, K / Bochow, A / Boisson, C / Bolmont, J / Borrel, V / Boutelier, T / Brucker, J / Brun, F /
    Brun, P / Bulik, T / Chadwick, P.M / Charbonnier, A / Chaves, R.C.G / Cheesebrough, A / Chounet, L.-M / Clapson, A.C / Coignet, G / Dalton, M / Daniel, M.K / Davids, I.D / de Jager, O.C / de Naurois, M / Degrange, B / Deil, C / Dickinson, H.J / Djannati-Ataï, A / Domainko, W / Drury, L. O'C / Dubois, F / Dubus, G / Dyks, J / Dyrda, M / Egberts, K / Emmanoulopoulos, D / Espigat, P / Förster, A / Füssling, M / Farnier, C / Fegan, S / Feinstein, F / Fiasson, A / Fontaine, G / Gérard, L / Göring, D / Gabici, S / Gallant, Y.A / Gerbig, D / Giebels, B / Glück, B / Glicenstein, J.F / Goret, P / Hauser, D / Hauser, M / Heinz, S / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J.A / Hoffmann, A / Hofmann, W / Hofverberg, P / Hoppe, S / Horns, D / Jacholkowska, A / Jahn, C / Jung, I / Katarzyński, K / Katz, U / Kaufmann, S / Keogh, D / Kerschhaggl, M / Khélifi, B / Khangulyan, D / Klochkov, D / Kluźniak, W / Kneiske, T / Komin, Nu / Kosack, K / Kossakowski, R / Lamanna, G / Lenain, J.-P / Lohse, T / Méhault, J / Marandon, V / Marcowith, A / Martineau-Huynh, O / Masbou, J / Maurin, D / McComb, T.J.L / Medina, M.C / Moderski, R / Moulin, E / Naumann-Godo, M / Nedbal, D / Nekrassov, D / Nicholas, B / Niemiec, J / Nolan, S.J / Ohm, S / Olive, J.F / Orford, K.J / Ostrowski, M / Pühlhofer, G / Panter, M / Pedaletti, G / Pelletier, G / Petrucci, P.-O / Pita, S / Punch, M / Quirrenbach, A / Raubenheimer, B.C / Raue, M / Rayner, S.M / Reimer, O / Renaud, M / Rieger, F / Ripken, J / Rob, L / Rosier-Lees, S / Rowell, G / Rudak, B / Rulten, C.B / Ruppel, J / Sahakian, V / Santangelo, A / Schöck, F.M / Schlickeiser, R / Schwanke, U / Schwarzburg, S / Schwemmer, S / Shalchi, A / Sikora, M / Skilton, J.L / Sol, H / Stawarz, Ł / Steenkamp, R / Stegmann, C / Stinzing, F / Superina, G / Szostek, A / Tam, P.H / Tavernet, J.-P / Terrier, R / Tibolla, O / Tluczykont, M / Völk, H.J / van Eldik, C / Vasileiadis, G / Venter, C / Venter, L / Vialle, J.P / Vincent, P / Vivier, M / Volpe, F / Wagner, S.J / Ward, M / Wilhelmi, E. de Oña / Zdziarski, A.A / Zech, A

    Science. 2009 Nov. 20, v. 326, no. 5956

    2009  

    Abstract: Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, the remnants of which are thought to accelerate energetic cosmic rays up to energies of approximately 10¹⁵ electron volts. We report the detection of gamma rays- ...

    Abstract Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, the remnants of which are thought to accelerate energetic cosmic rays up to energies of approximately 10¹⁵ electron volts. We report the detection of gamma rays--tracers of such cosmic rays--from the starburst galaxy NGC 253 using the High Energy Stereoscopic System (H.E.S.S.) array of imaging atmospheric Cherenkov telescopes. The gamma-ray flux above 220 billion electron volts is F = (5.5 ± 1.0stat ± 2.8sys) x 10⁻¹³ cm⁻² s⁻¹, implying a cosmic-ray density about three orders of magnitude larger than that in the center of the Milky Way. The fraction of cosmic-ray energy channeled into gamma rays in this starburst environment is five times as large as that in our Galaxy.
    Schlagwörter energy ; gamma radiation ; image analysis ; telescopes ; tracer techniques
    Sprache Englisch
    Erscheinungsverlauf 2009-1120
    Umfang p. 1080-1082.
    Erscheinungsort American Association for the Advancement of Science
    Dokumenttyp Artikel
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.1178826
    Datenquelle NAL Katalog (AGRICOLA)

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  10. Artikel ; Online: Radio imaging of the very-high-energy gamma-ray emission region in the central engine of a radio galaxy.

    Acciari, V A / Aliu, E / Arlen, T / Bautista, M / Beilicke, M / Benbow, W / Bradbury, S M / Buckley, J H / Bugaev, V / Butt, Y / Byrum, K / Cannon, A / Celik, O / Cesarini, A / Chow, Y C / Ciupik, L / Cogan, P / Cui, W / Dickherber, R /
    Fegan, S J / Finley, J P / Fortin, P / Fortson, L / Furniss, A / Gall, D / Gillanders, G H / Grube, J / Guenette, R / Gyuk, G / Hanna, D / Holder, J / Horan, D / Hui, C M / Humensky, T B / Imran, A / Kaaret, P / Karlsson, N / Kieda, D / Kildea, J / Konopelko, A / Krawczynski, H / Krennrich, F / Lang, M J / LeBohec, S / Maier, G / McCann, A / McCutcheon, M / Millis, J / Moriarty, P / Ong, R A / Otte, A N / Pandel, D / Perkins, J S / Petry, D / Pohl, M / Quinn, J / Ragan, K / Reyes, L C / Reynolds, P T / Roache, E / Rose, H J / Schroedter, M / Sembroski, G H / Smith, A W / Swordy, S P / Theiling, M / Toner, J A / Varlotta, A / Vincent, S / Wakely, S P / Ward, J E / Weekes, T C / Weinstein, A / Williams, D A / Wissel, S / Wood, M / Walker, R C / Davies, F / Hardee, P E / Junor, W / Ly, C / Aharonian, F / Akhperjanian, A G / Anton, G / Barres de Almeida, U / Bazer-Bachi, A R / Becherini, Y / Behera, B / Bernlöhr, K / Bochow, A / Boisson, C / Bolmont, J / Borrel, V / Brucker, J / Brun, F / Brun, P / Bühler, R / Bulik, T / Büsching, I / Boutelier, T / Chadwick, P M / Charbonnier, A / Chaves, R C G / Cheesebrough, A / Chounet, L-M / Clapson, A C / Coignet, G / Dalton, M / Daniel, M K / Davids, I D / Degrange, B / Deil, C / Dickinson, H J / Djannati-Ataï, A / Domainko, W / Drury, L O'C / Dubois, F / Dubus, G / Dyks, J / Dyrda, M / Egberts, K / Emmanoulopoulos, D / Espigat, P / Farnier, C / Feinstein, F / Fiasson, A / Förster, A / Fontaine, G / Füssling, M / Gabici, S / Gallant, Y A / Gérard, L / Gerbig, D / Giebels, B / Glicenstein, J F / Glück, B / Goret, P / Göhring, D / Hauser, D / Hauser, M / Heinz, S / Heinzelmann, G / Henri, G / Hermann, G / Hinton, J A / Hoffmann, A / Hofmann, W / Holleran, M / Hoppe, S / Horns, D / Jacholkowska, A / de Jager, O C / Jahn, C / Jung, I / Katarzyński, K / Katz, U / Kaufmann, S / Kendziorra, E / Kerschhaggl, M / Khangulyan, D / Khélifi, B / Keogh, D / Kluźniak, W / Kneiske, T / Komin, Nu / Kosack, K / Lamanna, G / Lenain, J-P / Lohse, T / Marandon, V / Martin, J M / Martineau-Huynh, O / Marcowith, A / Maurin, D / McComb, T J L / Medina, M C / Moderski, R / Moulin, E / Naumann-Godo, M / de Naurois, M / Nedbal, D / Nekrassov, D / Nicholas, B / Niemiec, J / Nolan, S J / Ohm, S / Olive, J-F / de Oña Wilhelmi, E / Orford, K J / Ostrowski, M / Panter, M / Paz Arribas, M / Pedaletti, G / Pelletier, G / Petrucci, P-O / Pita, S / Pühlhofer, G / Punch, M / Quirrenbach, A / Raubenheimer, B C / Raue, M / Rayner, S M / Renaud, M / Rieger, F / Ripken, J / Rob, L / Rosier-Lees, S / Rowell, G / Rudak, B / Rulten, C B / Ruppel, J / Sahakian, V / Santangelo, A / Schlickeiser, R / Schöck, F M / Schröder, R / Schwanke, U / Schwarzburg, S / Schwemmer, S / Shalchi, A / Sikora, M / Skilton, J L / Sol, H / Spangler, D / Stawarz, Ł / Steenkamp, R / Stegmann, C / Stinzing, F / Superina, G / Szostek, A / Tam, P H / Tavernet, J-P / Terrier, R / Tibolla, O / Tluczykont, M / van Eldik, C / Vasileiadis, G / Venter, C / Venter, L / Vialle, J P / Vincent, P / Vivier, M / Völk, H J / Volpe, F / Wagner, S J / Ward, M / Zdziarski, A A / Zech, A / Anderhub, H / Antonelli, L A / Antoranz, P / Backes, M / Baixeras, C / Balestra, S / Barrio, J A / Bastieri, D / Becerra González, J / Becker, J K / Bednarek, W / Berger, K / Bernardini, E / Biland, A / Bock, R K / Bonnoli, G / Bordas, P / Borla Tridon, D / Bosch-Ramon, V / Bose, D / Braun, I / Bretz, T / Britvitch, I / Camara, M / Carmona, E / Commichau, S / Contreras, J L / Cortina, J / Costado, M T / Covino, S / Curtef, V / Dazzi, F / De Angelis, A / De Cea del Pozo, E / Delgado Mendez, C / De los Reyes, R / De Lotto, B / De Maria, M / De Sabata, F / Dominguez, A / Dorner, D / Doro, M / Elsaesser, D / Errando, M / Ferenc, D / Fernández, E / Firpo, R / Fonseca, M V / Font, L / Galante, N / García López, R J / Garczarczyk, M / Gaug, M / Goebel, F / Hadasch, D / Hayashida, M / Herrero, A / Hildebrand, D / Höhne-Mönch, D / Hose, J / Hsu, C C / Jogler, T / Kranich, D / La Barbera, A / Laille, A / Leonardo, E / Lindfors, E / Lombardi, S / Longo, F / López, M / Lorenz, E / Majumdar, P / Maneva, G / Mankuzhiyil, N / Mannheim, K / Maraschi, L / Mariotti, M / Martínez, M / Mazin, D / Meucci, M / Miranda, J M / Mirzoyan, R / Miyamoto, H / Moldón, J / Moles, M / Moralejo, A / Nieto, D / Nilsson, K / Ninkovic, J / Oya, I / Paoletti, R / Paredes, J M / Pasanen, M / Pascoli, D / Pauss, F / Pegna, R G / Perez-Torres, M A / Persic, M / Peruzzo, L / Prada, F / Prandini, E / Puchades, N / Reichardt, I / Rhode, W / Ribó, M / Rico, J / Rissi, M / Robert, A / Rügamer, S / Saggion, A / Saito, T Y / Salvati, M / Sanchez-Conde, M / Satalecka, K / Scalzotto, V / Scapin, V / Schweizer, T / Shayduk, M / Shore, S N / Sidro, N / Sierpowska-Bartosik, A / Sillanpää, A / Sitarek, J / Sobczynska, D / Spanier, F / Stamerra, A / Stark, L S / Takalo, L / Tavecchio, F / Temnikov, P / Tescaro, D / Teshima, M / Torres, D F / Turini, N / Vankov, H / Wagner, R M / Zabalza, V / Zandanel, F / Zanin, R / Zapatero, J

    Science (New York, N.Y.)

    2009  Band 325, Heft 5939, Seite(n) 444–448

    Abstract: The accretion of matter onto a massive black hole is believed to feed the relativistic plasma jets found in many active galactic nuclei (AGN). Although some AGN accelerate particles to energies exceeding 10(12) electron volts and are bright sources of ... ...

    Abstract The accretion of matter onto a massive black hole is believed to feed the relativistic plasma jets found in many active galactic nuclei (AGN). Although some AGN accelerate particles to energies exceeding 10(12) electron volts and are bright sources of very-high-energy (VHE) gamma-ray emission, it is not yet known where the VHE emission originates. Here we report on radio and VHE observations of the radio galaxy Messier 87, revealing a period of extremely strong VHE gamma-ray flares accompanied by a strong increase of the radio flux from its nucleus. These results imply that charged particles are accelerated to very high energies in the immediate vicinity of the black hole.
    Sprache Englisch
    Erscheinungsdatum 2009-07-24
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.1175406
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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