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Buch ; Online: Novel Back-coated Glass Mirrors for the MAGIC Telescopes

Will, Martin / van Scherpenberg, Juliane / Mirzoyan, Razmik / Garczarczyk, Markus

2019

Abstract: The mirrors installed on Imaging Atmospheric Cherenkov Telescopes like the MAGIC telescopes in La Palma, Canary Islands, are constantly exposed to the harsh environment. They have to withstand wind-induced corrosion from dust and sand, changing ... ...

Abstract	The mirrors installed on Imaging Atmospheric Cherenkov Telescopes like the MAGIC telescopes in La Palma, Canary Islands, are constantly exposed to the harsh environment. They have to withstand wind-induced corrosion from dust and sand, changing temperatures, and rain. Because of the size of the telescope, protecting the structure with a dome is not practical. The current mirrors used in MAGIC are aluminum front-coated glass mirrors, covered by a thin quartz layer. But even with this protective layer, significant decrease in reflectivity can be seen on timescales of several years. The quartz layer is very delicate and can be easily scratched or damaged, which also makes cleaning the mirrors almost impossible. We have tested a novel design of glass mirrors that can be easily cleaned and should show almost no degradation in reflectivity due to environmental influences. The protective layer is a ultra-thin glass sheet which is back-coated with aluminum, making it possible to simply wipe the mirror with household cleaning tools. In this contribution we will present results from laboratory tests of reflectivity and focusing properties of prototype mirrors, as well as long-term tests on-site at the MAGIC telescopes. We will also outline plans for exchanging a large fraction of MAGIC mirrors with this novel design, guaranteeing a peak performance of MAGIC for the coming years. Comment: Proceedings of the ICRC 2019
Schlagwörter	Astrophysics - Instrumentation and Methods for Astrophysics
Thema/Rubrik (Code)	621
Erscheinungsdatum	2019-09-09
Erscheinungsland	us
Dokumenttyp	Buch ; Online
Datenquelle	BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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Artikel ; Online: Search for Gamma-Ray Spectral Lines from Dark Matter Annihilation up to 100 TeV toward the Galactic Center with MAGIC.

Abe, H / Abe, S / Acciari, V A / Aniello, T / Ansoldi, S / Antonelli, L A / Arbet Engels, A / Arcaro, C / Artero, M / Asano, K / Baack, D / Babić, A / Baquero, A / Barres de Almeida, U / Barrio, J A / Batković, I / Baxter, J / Becerra González, J / Bednarek, W /

Bernardini, E / Bernardos, M / Berti, A / Besenrieder, J / Bhattacharyya, W / Bigongiari, C / Biland, A / Blanch, O / Bonnoli, G / Bošnjak, Ž / Burelli, I / Busetto, G / Carosi, R / Carretero-Castrillo, M / Ceribella, G / Chai, Y / Chilingarian, A / Cikota, S / Colombo, E / Contreras, J L / Cortina, J / Covino, S / D'Amico, G / D'Elia, V / Da Vela, P / Dazzi, F / De Angelis, A / De Lotto, B / Del Popolo, A / Delfino, M / Delgado, J / Delgado Mendez, C / Depaoli, D / Di Pierro, F / Di Venere, L / Do Souto Espiñeira, E / Dominis Prester, D / Donini, A / Dorner, D / Doro, M / Elsaesser, D / Emery, G / Fallah Ramazani, V / Fariña, L / Fattorini, A / Font, L / Fruck, C / Fukami, S / Fukazawa, Y / García López, R J / Garczarczyk, M / Gasparyan, S / Gaug, M / Giesbrecht Paiva, J G / Giglietto, N / Giordano, F / Gliwny, P / Godinović, N / Green, J G / Green, D / Hadasch, D / Hahn, A / Hassan, T / Heckmann, L / Herrera, J / Hrupec, D / Hütten, M / Imazawa, R / Inada, T / Iotov, R / Ishio, K / Jiménez Martínez, I / Jormanainen, J / Kerszberg, D / Kobayashi, Y / Kubo, H / Kushida, J / Lamastra, A / Lelas, D / Leone, F / Lindfors, E / Linhoff, L / Lombardi, S / Longo, F / López-Coto, R / López-Moya, M / López-Oramas, A / Loporchio, S / Lorini, A / Lyard, E / Machado de Oliveira Fraga, B / Majumdar, P / Makariev, M / Maneva, G / Mang, N / Manganaro, M / Mangano, S / Mannheim, K / Mariotti, M / Martínez, M / Mas Aguilar, A / Mazin, D / Menchiari, S / Mender, S / Mićanović, S / Miceli, D / Miener, T / Miranda, J M / Mirzoyan, R / Molina, E / Mondal, H A / Moralejo, A / Morcuende, D / Moreno, V / Nakamori, T / Nanci, C / Nava, L / Neustroev, V / Nievas Rosillo, M / Nigro, C / Nilsson, K / Nishijima, K / Njoh Ekoume, T / Noda, K / Nozaki, S / Ohtani, Y / Oka, T / Otero-Santos, J / Paiano, S / Palatiello, M / Paneque, D / Paoletti, R / Paredes, J M / Pavletić, L / Persic, M / Pihet, M / Podobnik, F / Prada Moroni, P G / Prandini, E / Principe, G / Priyadarshi, C / Puljak, I / Rhode, W / Ribó, M / Rico, J / Righi, C / Rugliancich, A / Sahakyan, N / Saito, T / Sakurai, S / Satalecka, K / Saturni, F G / Schleicher, B / Schmidt, K / Schmuckermaier, F / Schubert, J L / Schweizer, T / Sitarek, J / Sliusar, V / Sobczynska, D / Spolon, A / Stamerra, A / Strišković, J / Strom, D / Strzys, M / Suda, Y / Surić, T / Takahashi, M / Takeishi, R / Tavecchio, F / Temnikov, P / Terauchi, K / Terzić, T / Teshima, M / Tosti, L / Truzzi, S / Tutone, A / Ubach, S / van Scherpenberg, J / Vazquez Acosta, M / Ventura, S / Verguilov, V / Viale, I / Vigorito, C F / Vitale, V / Vovk, I / Walter, R / Will, M / Wunderlich, C / Yamamoto, T / Zarić, D / Hiroshima, N / Kohri, K

Physical review letters

2022 Band 130, Heft 6, Seite(n) 61002

Abstract: Linelike features in TeV γ rays constitute a "smoking gun" for TeV-scale particle dark matter and new physics. Probing the Galactic Center region with ground-based Cherenkov telescopes enables the search for TeV spectral features in immediate association ...

Abstract	Linelike features in TeV γ rays constitute a "smoking gun" for TeV-scale particle dark matter and new physics. Probing the Galactic Center region with ground-based Cherenkov telescopes enables the search for TeV spectral features in immediate association with a dense dark matter reservoir at a sensitivity out of reach for satellite γ-ray detectors, and direct detection and collider experiments. We report on 223 hours of observations of the Galactic Center region with the MAGIC stereoscopic telescope system reaching γ-ray energies up to 100 TeV. We improved the sensitivity to spectral lines at high energies using large-zenith-angle observations and a novel background modeling method within a maximum-likelihood analysis in the energy domain. No linelike spectral feature is found in our analysis. Therefore, we constrain the cross section for dark matter annihilation into two photons to ⟨σv⟩≲5×10^{-28} cm^{3} s^{-1} at 1 TeV and ⟨σv⟩≲1×10^{-25} cm^{3} s^{-1} at 100 TeV, achieving the best limits to date for a dark matter mass above 20 TeV and a cuspy dark matter profile at the Galactic Center. Finally, we use the derived limits for both cuspy and cored dark matter profiles to constrain supersymmetric wino models.
Sprache	Englisch
Erscheinungsdatum	2022-04-08
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.130.061002
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel ; Online: Verification of the Optical System of the 9.7-m Prototype Schwarzschild-Couder Telescope

Adams, C. / Alfaro, R. / Ambrosi, G. / Ambrosio, M. / Aramo, C. / Benbow, W. / Bertucci, B. / Bissaldi, E. / Bitossi, M. / Boiano, A. / Bonavolonta, C. / Bose, R. / Brill, A. / Buckley, J. H. / Byrum, K. / Cameron, R. A. / Capasso, M. / Caprai, M. / Covault, C. E. /

Venere, L. Di / Fegan, S. / Feng, Q. / Fiandrini, E. / Furniss, A. / Garczarczyk, M. / Garfias, F. / Gent, A. / Giglietto, N. / Giordano, F. / Gonz'alez, M. M. / Halliday, R. / Hervet, O. / Hughes, G. / Humensky, T. B. / Ionica, M. / Iriarte, A. / Jin, W. / Kaarat, P. / Kieda, D. / Kim, B. / Licciulli, F. / Limon, M. / Loporchio, S. / Masone, V. / Meures, T. / Mode, B. A. W. / Mukherjee, R. / Nieto, D. / Okumura, A. / Otte, N. / Palombara, N. La / Pantaleo, F. R. / Paoletti, R. / Pareschi, G. / Petrashyk, A. / Powell, J. / Powell, K. / Ribeiro, D. / Roache, E. / Rousselle, J. / Rugliancich, A. / Ru'iz-D'iaz-Soto, J. / Santander, M. / Schlenstedt, S. / Scuderi, S. / Shang, R. / Sironi, G. / Stevenson, B. / Stiaccini, L. / Taylor, L. P. / Tosti, L. / Tovmassian, G. / Vagelli, V. / Valentino, M. / Vandenbroucke, J. / Vassiliev, V. V. / Wakely, S. P. / Wilcox, P. / Williams, D. A. / Yu, P.

Abstract: For the first time in the history of ground-based $\gamma$-ray astronomy, the on-axis performance of the dual mirror, aspheric, aplanatic Schwarzschild-Couder optical system has been demonstrated in a $9.7$-m aperture imaging atmospheric Cherenkov ... ...

Abstract	For the first time in the history of ground-based $\gamma$-ray astronomy, the on-axis performance of the dual mirror, aspheric, aplanatic Schwarzschild-Couder optical system has been demonstrated in a $9.7$-m aperture imaging atmospheric Cherenkov telescope. The novel design of the prototype Schwarzschild-Couder Telescope (pSCT) is motivated by the need of the next-generation Cherenkov Telescope Array (CTA) observatory to have the ability to perform wide ($\geq 8^{\circ}$) field-of-view observations simultaneously with superior imaging of atmospheric cascades (resolution of $0.067^{\circ}$ per pixel or better). The pSCT design, if implemented in the CTA installation, has the potential to improve significantly both the $\gamma$-ray angular resolution and the off-axis sensitivity of the observatory, reaching nearly the theoretical limit of the technique and thereby making a major impact on the CTA observatory sky survey programs, follow-up observations of multi-messenger transients with poorly known initial localization, as well as on the spatially resolved spectroscopic studies of extended $\gamma$-ray sources. This contribution reports on the initial alignment procedures and point-spread-function results for the challenging segmented aspheric primary and secondary mirrors of the pSCT.
Schlagwörter	covid19
Verlag	ArXiv
Dokumenttyp	Artikel ; Online
DOI	10.1117/12.2568134
Datenquelle	COVID19

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Artikel ; Online: Bounds on Lorentz Invariance Violation from MAGIC Observation of GRB 190114C.

Acciari, V A / Ansoldi, S / Antonelli, L A / Arbet Engels, A / Baack, D / Babić, A / Banerjee, B / Barres de Almeida, U / Barrio, J A / Becerra González, J / Bednarek, W / Bellizzi, L / Bernardini, E / Berti, A / Besenrieder, J / Bhattacharyya, W / Bigongiari, C / Biland, A / Blanch, O /

Bonnoli, G / Bošnjak, Ž / Busetto, G / Carosi, R / Ceribella, G / Cerruti, M / Chai, Y / Chilingarian, A / Cikota, S / Colak, S M / Colin, U / Colombo, E / Contreras, J L / Cortina, J / Covino, S / D'Amico, G / D'Elia, V / Da Vela, P / Dazzi, F / De Angelis, A / De Lotto, B / Delfino, M / Delgado, J / Depaoli, D / Di Pierro, F / Di Venere, L / Do Souto Espiñeira, E / Dominis Prester, D / Donini, A / Dorner, D / Doro, M / Elsaesser, D / Fallah Ramazani, V / Fattorini, A / Ferrara, G / Foffano, L / Fonseca, M V / Font, L / Fruck, C / Fukami, S / García López, R J / Garczarczyk, M / Gasparyan, S / Gaug, M / Giglietto, N / Giordano, F / Gliwny, P / Godinović, N / Green, D / Hadasch, D / Hahn, A / Herrera, J / Hoang, J / Hrupec, D / Hütten, M / Inada, T / Inoue, S / Ishio, K / Iwamura, Y / Jouvin, L / Kajiwara, Y / Karjalainen, M / Kerszberg, D / Kobayashi, Y / Kubo, H / Kushida, J / Lamastra, A / Lelas, D / Leone, F / Lindfors, E / Lombardi, S / Longo, F / López, M / López-Coto, R / López-Oramas, A / Loporchio, S / Machado de Oliveira Fraga, B / Maggio, C / Majumdar, P / Makariev, M / Mallamaci, M / Maneva, G / Manganaro, M / Mannheim, K / Maraschi, L / Mariotti, M / Martínez, M / Mazin, D / Mender, S / Mićanović, S / Miceli, D / Miener, T / Minev, M / Miranda, J M / Mirzoyan, R / Molina, E / Moralejo, A / Morcuende, D / Moreno, V / Moretti, E / Munar-Adrover, P / Neustroev, V / Nigro, C / Nilsson, K / Ninci, D / Nishijima, K / Noda, K / Nogués, L / Nozaki, S / Ohtani, Y / Oka, T / Otero-Santos, J / Palatiello, M / Paneque, D / Paoletti, R / Paredes, J M / Pavletić, L / Peñil, P / Perennes, C / Peresano, M / Persic, M / Prada Moroni, P G / Prandini, E / Puljak, I / Rhode, W / Ribó, M / Rico, J / Righi, C / Rugliancich, A / Saha, L / Sahakyan, N / Saito, T / Sakurai, S / Satalecka, K / Schleicher, B / Schmidt, K / Schweizer, T / Sitarek, J / Šnidarić, I / Sobczynska, D / Spolon, A / Stamerra, A / Strom, D / Strzys, M / Suda, Y / Surić, T / Takahashi, M / Tavecchio, F / Temnikov, P / Terzić, T / Teshima, M / Torres-Albà, N / Tosti, L / van Scherpenberg, J / Vanzo, G / Vazquez Acosta, M / Ventura, S / Verguilov, V / Vigorito, C F / Vitale, V / Vovk, I / Will, M / Zarić, D / Nava, L

Physical review letters

2020 Band 125, Heft 2, Seite(n) 21301

Abstract: On January 14, 2019, the Major Atmospheric Gamma Imaging Cherenkov telescopes detected GRB 190114C above 0.2 TeV, recording the most energetic photons ever observed from a gamma-ray burst. We use this unique observation to probe an energy dependence of ... ...

Abstract	On January 14, 2019, the Major Atmospheric Gamma Imaging Cherenkov telescopes detected GRB 190114C above 0.2 TeV, recording the most energetic photons ever observed from a gamma-ray burst. We use this unique observation to probe an energy dependence of the speed of light in vacuo for photons as predicted by several quantum gravity models. Based on a set of assumptions on the possible intrinsic spectral and temporal evolution, we obtain competitive lower limits on the quadratic leading order of speed of light modification.
Sprache	Englisch
Erscheinungsdatum	2020-07-23
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.125.021301
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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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)

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Artikel ; Online: Black hole physics. Black hole lightning due to particle acceleration at subhorizon scales.

Aleksić, J / Ansoldi, S / Antonelli, L A / Antoranz, P / Babic, A / Bangale, P / Barrio, J A / Becerra González, J / Bednarek, W / Bernardini, E / Biasuzzi, B / Biland, A / Blanch, O / Bonnefoy, S / Bonnoli, G / Borracci, F / Bretz, T / Carmona, E / Carosi, A /

Colin, P / Colombo, E / Contreras, J L / Cortina, J / Covino, S / Da Vela, P / Dazzi, F / De Angelis, A / De Caneva, G / De Lotto, B / de Oña Wilhelmi, E / Delgado Mendez, C / Dominis Prester, D / Dorner, D / Doro, M / Einecke, S / Eisenacher, D / Elsaesser, D / Fonseca, M V / Font, L / Frantzen, K / Fruck, C / Galindo, D / García López, R J / Garczarczyk, M / Garrido Terrats, D / Gaug, M / Godinović, N / González Muñoz, A / Gozzini, S R / Hadasch, D / Hanabata, Y / Hayashida, M / Herrera, J / Hildebrand, D / Hose, J / Hrupec, D / Idec, W / Kadenius, V / Kellermann, H / Kodani, K / Konno, Y / Krause, J / Kubo, H / Kushida, J / La Barbera, A / Lelas, D / Lewandowska, N / Lindfors, E / Lombardi, S / Longo, F / López, M / López-Coto, R / López-Oramas, A / Lorenz, E / Lozano, I / Makariev, M / Mallot, K / Maneva, G / Mankuzhiyil, N / Mannheim, K / Maraschi, L / Marcote, B / Mariotti, M / Martínez, M / Mazin, D / Menzel, U / Miranda, J M / Mirzoyan, R / Moralejo, A / Munar-Adrover, P / Nakajima, D / Niedzwiecki, A / Nilsson, K / Nishijima, K / Noda, K / Orito, R / Overkemping, A / Paiano, S / Palatiello, M / Paneque, D / Paoletti, R / Paredes, J M / Paredes-Fortuny, X / Persic, M / Poutanen, J / Prada Moroni, P G / Prandini, E / Puljak, I / Reinthal, R / Rhode, W / Ribó, M / Rico, J / Rodriguez Garcia, J / Rügamer, S / Saito, T / Saito, K / Satalecka, K / Scalzotto, V / Scapin, V / Schultz, C / Schweizer, T / Shore, S N / Sillanpää, A / Sitarek, J / Snidaric, I / Sobczynska, D / Spanier, F / Stamatescu, V / Stamerra, A / Steinbring, T / Storz, J / Strzys, M / Takalo, L / Takami, H / Tavecchio, F / Temnikov, P / Terzić, T / Tescaro, D / Teshima, M / Thaele, J / Tibolla, O / Torres, D F / Toyama, T / Treves, A / Uellenbeck, M / Vogler, P / Zanin, R / Kadler, M / Schulz, R / Ros, E / Bach, U / Krauß, F / Wilms, J

Science (New York, N.Y.)

2014 Band 346, Heft 6213, Seite(n) 1080–1084

Abstract: Supermassive black holes with masses of millions to billions of solar masses are commonly found in the centers of galaxies. Astronomers seek to image jet formation using radio interferometry but still suffer from insufficient angular resolution. An ... ...

Abstract	Supermassive black holes with masses of millions to billions of solar masses are commonly found in the centers of galaxies. Astronomers seek to image jet formation using radio interferometry but still suffer from insufficient angular resolution. An alternative method to resolve small structures is to measure the time variability of their emission. Here we report on gamma-ray observations of the radio galaxy IC 310 obtained with the MAGIC (Major Atmospheric Gamma-ray Imaging Cherenkov) telescopes, revealing variability with doubling time scales faster than 4.8 min. Causality constrains the size of the emission region to be smaller than 20% of the gravitational radius of its central black hole. We suggest that the emission is associated with pulsar-like particle acceleration by the electric field across a magnetospheric gap at the base of the radio jet.
Sprache	Englisch
Erscheinungsdatum	2014-11-28
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.1256183
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel ; Online: Very-high-energy gamma rays from a distant quasar: how transparent is the universe?

Albert, J / Aliu, E / Anderhub, H / Antonelli, L A / Antoranz, P / Backes, M / Baixeras, C / Barrio, J A / Bartko, H / Bastieri, D / Becker, J K / Bednarek, W / Berger, K / Bernardini, E / Bigongiari, C / Biland, A / Bock, R K / Bonnoli, G / Bordas, P /

Bosch-Ramon, V / Bretz, T / Britvitch, I / Camara, M / Carmona, E / Chilingarian, A / Commichau, S / Contreras, J L / Cortina, J / Costado, M T / Covino, S / Curtef, V / Dazzi, F / De Angelis, A / De Cea Del Pozo, E / de Los Reyes, R / De Lotto, B / De Maria, M / De Sabata, F / Mendez, C Delgado / Dominguez, A / Dorner, D / Doro, M / Errando, M / Fagiolini, M / Ferenc, D / Fernández, E / Firpo, R / Fonseca, M V / Font, L / Galante, N / López, R J García / Garczarczyk, M / Gaug, M / Goebel, F / Hayashida, M / Herrero, A / Höhne, D / Hose, J / Hsu, C C / Huber, S / Jogler, T / Kneiske, T M / 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 / Meyer, M / Miranda, J M / Mirzoyan, R / Mizobuchi, S / Moles, M / Moralejo, A / Nieto, D / Nilsson, K / Ninkovic, J / Otte, N / Oya, I / Panniello, M / Paoletti, R / Paredes, J M / Pasanen, M / Pascoli, D / Pauss, F / Pegna, R G / Perez-Torres, M A / Persic, M / Peruzzo, L / Piccioli, A / Prada, F / Prandini, E / Puchades, N / Raymers, A / Rhode, W / Ribó, M / Rico, J / Rissi, M / Robert, A / Rügamer, S / Saggion, A / Saito, T Y / Salvati, M / Sanchez-Conde, M / Sartori, P / Satalecka, K / Scalzotto, V / Scapin, V / Schmitt, R / Schweizer, T / Shayduk, M / Shinozaki, K / Shore, S N / Sidro, N / Sierpowska-Bartosik, A / Sillanpää, A / Sobczynska, D / Spanier, F / Stamerra, A / Stark, L S / Takalo, L / Tavecchio, F / Temnikov, P / Tescaro, D / Teshima, M / Tluczykont, M / Torres, D F / Turini, N / Vankov, H / Venturini, A / Vitale, V / Wagner, R M / Wittek, W / Zabalza, V / Zandanel, F / Zanin, R / Zapatero, J

Science (New York, N.Y.)

2008 Band 320, Heft 5884, Seite(n) 1752–1754

Abstract: The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has detected very-high-energy gamma rays from a giant flare of the distant Quasi-Stellar Radio Source (in short: radio quasar) 3C 279, at a distance of more than 5 ... ...

Abstract	The atmospheric Cherenkov gamma-ray telescope MAGIC, designed for a low-energy threshold, has detected very-high-energy gamma rays from a giant flare of the distant Quasi-Stellar Radio Source (in short: radio quasar) 3C 279, at a distance of more than 5 billion light-years (a redshift of 0.536). No quasar has been observed previously in very-high-energy gamma radiation, and this is also the most distant object detected emitting gamma rays above 50 gigaelectron volts. Because high-energy gamma rays may be stopped by interacting with the diffuse background light in the universe, the observations by MAGIC imply a low amount for such light, consistent with that known from galaxy counts.
Sprache	Englisch
Erscheinungsdatum	2008-06-27
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.1157087
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel ; Online: Observation of pulsed gamma-rays above 25 GeV from the Crab pulsar with MAGIC.

Aliu, E / Anderhub, H / Antonelli, L A / Antoranz, P / Backes, M / Baixeras, C / Barrio, J A / Bartko, H / Bastieri, D / Becker, J K / Bednarek, W / Berger, K / Bernardini, E / Bigongiari, C / Biland, A / Bock, R K / Bonnoli, G / Bordas, P / Bosch-Ramon, V /

Bretz, T / Britvitch, I / Camara, M / Carmona, E / Chilingarian, A / Commichau, S / Contreras, J L / Cortina, J / Costado, M T / Covino, S / Curtef, V / Dazzi, F / De Angelis, A / De Cea Del Pozo, E / de Los Reyes, R / De Lotto, B / De Maria, M / De Sabata, F / Delgado Mendez, C / Dominguez, A / Dorner, D / Doro, M / Elsässer, D / Errando, M / Fagiolini, M / Ferenc, D / Fernandez, E / Firpo, R / Fonseca, M V / Font, L / Galante, N / Garcia Lopez, R J / Garczarczyk, M / Gaug, M / Goebel, F / Hadasch, D / Hayashida, M / Herrero, A / Höhne, D / Hose, J / Hsu, C C / Huber, S / Jogler, T / Kranich, D / La Barbera, A / Laille, A / Leonardo, E / Lindfors, E / Lombardi, S / Longo, F / Lopez, M / Lorenz, E / Majumdar, P / Maneva, G / Mankuzhiyil, N / Mannheim, K / Maraschi, L / Mariotti, M / Martinez, M / Mazin, D / Meucci, M / Meyer, M / Miranda, J M / Mirzoyan, R / Moles, M / Moralejo, A / Nieto, D / Nilsson, K / Ninkovic, J / Otte, N / Oya, I / Paoletti, R / Paredes, J M / Pasanen, M / Pascoli, D / Pauss, F / Pegna, R G / Perez-Torres, M A / Persic, M / Peruzzo, L / Piccioli, A / Prada, F / Prandini, E / Puchades, N / Raymers, A / Rhode, W / Ribó, M / Rico, J / Rissi, M / Robert, A / Rügamer, S / Saggion, A / Saito, T Y / Salvati, M / Sanchez-Conde, M / Sartori, P / Satalecka, K / Scalzotto, V / Scapin, V / Schweizer, T / Shayduk, M / Shinozaki, K / Shore, S N / Sidro, N / Sierpowska-Bartosik, A / Sillanpää, A / Sobczynska, D / Spanier, F / Stamerra, A / Stark, L S / Takalo, L / Tavecchio, F / Temnikov, P / Tescaro, D / Teshima, M / Tluczykont, M / Torres, D F / Turini, N / Vankov, H / Venturini, A / Vitale, V / Wagner, R M / Wittek, W / Zabalza, V / Zandanel, F / Zanin, R / Zapatero, J / de Jager, O C / de Ona Wilhelmi, E

Science (New York, N.Y.)

2008 Band 322, Heft 5905, Seite(n) 1221–1224

Abstract: One fundamental question about pulsars concerns the mechanism of their pulsed electromagnetic emission. Measuring the high-end region of a pulsar's spectrum would shed light on this question. By developing a new electronic trigger, we lowered the ... ...

Abstract	One fundamental question about pulsars concerns the mechanism of their pulsed electromagnetic emission. Measuring the high-end region of a pulsar's spectrum would shed light on this question. By developing a new electronic trigger, we lowered the threshold of the Major Atmospheric gamma-ray Imaging Cherenkov (MAGIC) telescope to 25 giga-electron volts. In this configuration, we detected pulsed gamma-rays from the Crab pulsar that were greater than 25 giga-electron volts, revealing a relatively high cutoff energy in the phase-averaged spectrum. This indicates that the emission occurs far out in the magnetosphere, hence excluding the polar-cap scenario as a possible explanation of our measurement. The high cutoff energy also challenges the slot-gap scenario.
Sprache	Englisch
Erscheinungsdatum	2008-11-21
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.1164718
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel ; Online: Variable very-high-energy gamma-ray emission from the microquasar LS I +61 303.

Albert, J / Aliu, E / Anderhub, H / Antoranz, P / Armada, A / Asensio, M / Baixeras, C / Barrio, J A / Bartelt, M / Bartko, H / Bastieri, D / Bavikadi, S R / Bednarek, W / Berger, K / Bigongiari, C / Biland, A / Bisesi, E / Bock, R K / Bordas, P /

Bosch-Ramon, V / Bretz, T / Britvitch, I / Camara, M / Carmona, E / Chilingarian, A / Ciprini, S / Coarasa, J A / Commichau, S / Contreras, J L / Cortina, J / Curtef, V / Danielyan, V / Dazzi, F / De Angelis, A / de Los Reyes, R / De Lotto, B / Domingo-Santamaría, E / Dorner, D / Doro, M / Errando, M / Fagiolini, M / Ferenc, D / Fernández, E / Firpo, R / Flix, J / Fonseca, M V / Font, L / Fuchs, M / Galante, N / Garczarczyk, M / Gaug, M / Giller, M / Goebel, F / Hakobyan, D / Hayashida, M / Hengstebeck, T / Höhne, D / Hose, J / Hsu, C C / Isar, P G / Jacon, P / Kalekin, O / Kosyra, R / Kranich, D / Laatiaoui, M / Laille, A / Lenisa, T / Liebing, P / Lindfors, E / Lombardi, S / Longo, F / López, J / López, M / Lorenz, E / Lucarelli, F / Majumdar, P / Maneva, G / Mannheim, K / Mansutti, O / Mariotti, M / Martínez, M / Mase, K / Mazin, D / Merck, C / Meucci, M / Meyer, M / Miranda, J M / Mirzoyan, R / Mizobuchi, S / Moralejo, A / Nilsson, K / Oña-Wilhelmi, E / Orduña, R / Otte, N / Oya, I / Paneque, D / Paoletti, R / Paredes, J M / Pasanen, M / Pascoli, D / Pauss, F / Pavel, N / Pegna, R / Persic, M / Peruzzo, L / Piccioli, A / Poller, M / Pooley, G / Prandini, E / Raymers, A / Rhode, W / Ribó, M / Rico, J / Riegel, B / Rissi, M / Robert, A / Romero, G E / Rügamer, S / Saggion, A / Sánchez, A / Sartori, P / Scalzotto, V / Scapin, V / Schmitt, R / Schweizer, T / Shayduk, M / Shinozaki, K / Shore, S N / Sidro, N / Sillanpää, A / Sobczynska, D / Stamerra, A / Stark, L S / Takalo, L / Temnikov, P / Tescaro, D / Teshima, M / Tonello, N / Torres, A / Torres, D F / Turini, N / Vankov, H / Vitale, V / Wagner, R M / Wibig, T / Wittek, W / Zanin, R / Zapatero, J

Science (New York, N.Y.)

2006 Band 312, Heft 5781, Seite(n) 1771–1773

Abstract: Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and can be used to elucidate the physics of relativistic jets. We report the detection of variable gamma-ray emission above 100 ... ...

Abstract	Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and can be used to elucidate the physics of relativistic jets. We report the detection of variable gamma-ray emission above 100 gigaelectron volts from the microquasar LS I 61 + 303. Six orbital cycles were recorded. Several detections occur at a similar orbital phase, which suggests that the emission is periodic. The strongest gamma-ray emission is not observed when the two stars are closest to one another, implying a strong orbital modulation of the emission or absorption processes.
Sprache	Englisch
Erscheinungsdatum	2006-06-23
Erscheinungsland	United States
Dokumenttyp	Journal Article
ZDB-ID	128410-1
ISSN	1095-9203 ; 0036-8075
ISSN (online)	1095-9203
ISSN	0036-8075
DOI	10.1126/science.1128177
Datenquelle	MEDical Literature Analysis and Retrieval System OnLINE

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Artikel ; Online: Variable Very-High-Energy Gamma-Ray Emission from the Microquasar LS I +61 303

J. Albert / Aliu, E. / Anderhub, H. / Antoranz, P. / Armada, A. / Asensio, M. / Baixeras, C. / Barrio, J.A. / Bartelt, M. / Bartko, H. / Bastieri, D. / Bavikadi, S.R. / Bednarek, W. / Berger, K. / Bigongiari, C. / Biland, A. / Bisesi, E. / Bock, R.K. / Bordas, P. /

Bosch-Ramon, V. / Bretz, T. / Britvitch, I. / Camara, M. / Carmona, E. / Chilingarian, A. / Ciprini, S. / Coarasa, J.A. / Commichau, S. / Contreras, J.L. / Cortina, J. / Curtef, V. / Danielyan, V. / Dazzi, F. / De Angelis, A. / Reyes, R. de los / De Lotto, B. / Domingo-Santamaría, E. / Dorner, D. / Doro, M. / Errando, M. / Fagiolini, M. / Ferenc, D. / Fernández, E. / Firpo, R. / Flix, J. / Fonseca, M.V. / Font, L. / Fuchs, M. / Galante, N. / Garczarczyk, M. / Gaug, M. / Giller, M. / Goebel, F. / Hakobyan, D. / Hayashida, M. / Hengstebeck, T. / Höhne, D. / Hose, J. / Hsu, C.C. / Isar, P.G. / Jacon, P. / Kalekin, O. / Kosyra, R. / Kranich, D. / Laatiaoui, M. / Laille, A. / Lenisa, T. / Liebing, P. / Lindfors, E. / Lombardi, S. / Longo, F. / López Izquierdo, J. / López, M. / Lorenz, E. / Lucarelli, F. / Majumdar, P. / Maneva, G. / Mannheim, K. / Mansutti, O. / Mariotti, M. / Martínez, M. / Mase, K. / Mazin, D. / Merck, C. / Meucci, M. / Meyer, M. / Miranda, J.M. / Mirzoyan, R. / Mizobuchi, S. / Moralejo, A. / Nilsson, K. / Oña-Wilhelmi, E. / Orduña, R. / Otte, N. / Oya, I. / Paneque, D. / Paoletti, R. / Paredes, J.M. / Pasanen, M. / Pascoli, D. / Pauss, F. / Pavel, N. / Pegna, R. / Persic, M. / Peruzzo, L. / Piccioli, A. / Poller, M. / Pooley, G. / Prandini, E. / Raymers, A. / Rhode, W. / Ribó, M. / Rico, J. / Riegel, B. / Rissi, M. / Robert, A. / Romero, G.E. / Rügamer, S. / Saggion, A. / Sánchez, A. / Sartori, P. / Scalzotto, V. / Scapin, V. / Schmitt, R. / Schweizer, T. / Shayduk, M. / Shinozaki, K. / Shore, S.N. / Sidro, N. / Sillanpää, A. / Sobczynska, D. / Stamerra, A. / Stark, L.S. / Takalo, L. / Temnikov, P. / Tescaro, D. / Teshima, M. / Tonello, N. / Torres, A. / Torres, D.F. / Turini, N. / Vankov, H. / Vitale, V. / Wagner, R.M. / Wibig, T. / Wittek, W. / Zanin, R. / Zapatero, J.

Science. 2006 June 23, v. 312, no. 5781 p.1771-1773

2006

Abstract	Microquasars are binary star systems with relativistic radio-emitting jets. They are potential sources of cosmic rays and can be used to elucidate the physics of relativistic jets. We report the detection of variable gamma-ray emission above 100 gigaelectron volts from the microquasar LS I 61 + 303. Six orbital cycles were recorded. Several detections occur at a similar orbital phase, which suggests that the emission is periodic. The strongest gamma-ray emission is not observed when the two stars are closest to one another, implying a strong orbital modulation of the emission or absorption processes.
Schlagwörter	absorption ; gamma radiation
Sprache	Englisch
Erscheinungsverlauf	2006-0623
Umfang	p. 1771-1773.
Erscheinungsort	American Association for the Advancement of Science
Dokumenttyp	Artikel ; Online
ZDB-ID	128410-1
ISSN	1095-9203 ; 0036-8075
ISSN (online)	1095-9203
ISSN	0036-8075
DOI	10.1126/science.1128177
Datenquelle	NAL Katalog (AGRICOLA)

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