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Article ; Online: Observation of Rayleigh-Lamb waves generated by the 2022 Hunga-Tonga volcanic eruption with the POLA detectors at Ny-Ålesund.

Abbrescia, M / Avanzini, C / Baldini, L / Ferroli, R Baldini / Batignani, G / Battaglieri, M / Boi, S / Bossini, E / Carnesecchi, F / Casula, M / Cavazza, D / Cicalò, C / Cifarelli, L / Coccetti, F / Coccia, E / Corvaglia, A / Gruttola, D De / Pasquale, S De / Galante, L /

Garbini, M / Gemme, G / Gnesi, I / Gramstad, E / Grazzi, S / Haland, E S / Hatzifotiadou, D / Rocca, P La / Liu, Z / Lombardo, L / Mandaglio, G / Margotti, A / Maron, G / Mazziotta, M N / Mazzola, M / Mulliri, A / Nania, R / Noferini, F / Nozzoli, F / Ould-Saada, F / Palmonari, F / Panareo, M / Panetta, M P / Paoletti, R / Parvis, M / Pellegrino, C / Perasso, L / Pinazza, O / Pinto, C / Pisano, S / Riggi, F / Righini, G / Ripoli, C / Rizzi, M / Sartorelli, G / Scapparone, E / Schioppa, M / Scioli, G / Scribano, A / Selvi, M / Taiuti, M / Terreni, G / Trifirò, A / Trimarchi, M / Viola, A P / Vistoli, C / Votano, L / Williams, M C S / Zichichi, A / Zuyeuski, R

Scientific reports

2022 Volume 12, Issue 1, Page(s) 19978

Abstract: The eruption of the Hunga-Tonga volcano in the South Pacific Ocean on January 15, 2022, at about 4:15 UTC, generated a violent explosion, which created atmospheric pressure disturbances in the form of Rayleigh-Lamb waves detected all over the globe. Here ...

Abstract	The eruption of the Hunga-Tonga volcano in the South Pacific Ocean on January 15, 2022, at about 4:15 UTC, generated a violent explosion, which created atmospheric pressure disturbances in the form of Rayleigh-Lamb waves detected all over the globe. Here we discuss the observation of the Hunga-Tonga shock-wave performed at the Ny-Ålesund Research Station on the Spitsbergen island, by the detectors of the PolarquEEEst experiment and their ancillary sensors. Online pressure data as well as the results of dedicated offline analysis are presented and discussed in details. Results include wave arrival times, wave amplitude measurements and wave velocity calculation. We observed five passages of the shock wave with a significance larger than 3 [Formula: see text] and an amplitude up to 1 hPa. The average propagation velocity resulted to be (308 ± 0.6) m/s. Possible effects of the atmospheric pressure variation associated with the shock-wave multiple passages on the cosmic-ray rate at ground level are also investigated. We did not find any significant evidence of this effect.
Language	English
Publishing date	2022-11-20
Publishing country	England
Document type	Journal Article
ZDB-ID	2615211-3
ISSN	2045-2322 ; 2045-2322
ISSN (online)	2045-2322
ISSN	2045-2322
DOI	10.1038/s41598-022-23984-2
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Investigating the Nature of Late-Time High-Energy GRB Emission Through Joint

Ajello, M / Baldini, L / Barbiellini, G / Bastieri, D / Bellazzini, R / Bissaldi, E / Blandford, R D / Bonino, R / Bottacini, E / Bregeon, J / Bruel, P / Buehler, R / Cameron, R A / Caputo, R / Caraveo, P A / Chiaro, G / Ciprini, S / Cohen-Tanugi, J / Costantin, D /

D'Ammando, F / DE Palma, F / DI Lalla, N / DI Mauro, M / DI Venere, L / Domínguez, A / Favuzzi, C / Franckowiak, A / Fukazawa, Y / Funk, S / Fusco, P / Gargano, F / Gasparrini, D / Giglietto, N / Giordano, F / Giroletti, M / Green, D / Grenier, I A / Guiriec, S / Holt, C / Horan, D / Jóhannesson, G / Kocevski, D / Kuss, M / LA Mura, G / Larsson, S / Li, J / Longo, F / Loparco, F / Lubrano, P / Magill, J D / Maldera, S / Manfreda, A / Mazziotta, M N / Michelson, P F / Mizuno, T / Monzani, M E / Morselli, A / Negro, M / Nuss, E / Omodei, N / Orienti, M / Orlando, E / Paliya, V S / Perkins, J S / Persic, M / Pesce-Rollins, M / Piron, F / Principe, G / Racusin, J L / Rainò, S / Rando, R / Razzano, M / Razzaque, S / Reimer, A / Reimer, O / Sgrò, C / Siskind, E J / Spandre, G / Spinelli, P / Tak, D / Thayer, J B / Torres, D F / Tosti, G / Valverde, J / Vogel, M / Wood, K

The Astrophysical journal

2018 Volume 863, Issue 2

Abstract: We use joint observations by ... ...

Abstract	We use joint observations by the
Language	English
Publishing date	2018-08-17
Publishing country	United States
Document type	Journal Article
ZDB-ID	2960-9
ISSN	0004-637X
ISSN	0004-637X
DOI	10.3847/1538-4357/aad000
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Article ; Online: Measurement of the Cosmic Ray Helium Energy Spectrum from 70 GeV to 80 TeV with the DAMPE Space Mission.

Alemanno, F / An, Q / Azzarello, P / Barbato, F C T / Bernardini, P / Bi, X J / Cai, M S / Catanzani, E / Chang, J / Chen, D Y / Chen, J L / Chen, Z F / Cui, M Y / Cui, T S / Cui, Y X / Dai, H T / D'Amone, A / De Benedittis, A / De Mitri, I /

de Palma, F / Deliyergiyev, M / Di Santo, M / Dong, T K / Dong, Z X / Donvito, G / Droz, D / Duan, J L / Duan, K K / D'Urso, D / Fan, R R / Fan, Y Z / Fang, K / Fang, F / Feng, C Q / Feng, L / Fusco, P / Gao, M / Gargano, F / Gong, K / Gong, Y Z / Guo, D Y / Guo, J H / Guo, X L / Han, S X / Hu, Y M / Huang, G S / Huang, X Y / Huang, Y Y / Ionica, M / Jiang, W / Kong, J / Kotenko, A / Kyratzis, D / Lei, S J / Li, S / Li, W L / Li, X / Li, X Q / Liang, Y M / Liu, C M / Liu, H / Liu, J / Liu, S B / Liu, W Q / Liu, Y / Loparco, F / Luo, C N / Ma, M / Ma, P X / Ma, T / Ma, X Y / Marsella, G / Mazziotta, M N / Mo, D / Niu, X Y / Pan, X / Parenti, A / Peng, W X / Peng, X Y / Perrina, C / Qiao, R / Rao, J N / Ruina, A / Salinas, M M / Shang, G Z / Shen, W H / Shen, Z Q / Shen, Z T / Silveri, L / Song, J X / Stolpovskiy, M / Su, H / Su, M / Sun, Z Y / Surdo, A / Teng, X J / Tykhonov, A / Wang, H / Wang, J Z / Wang, L G / Wang, S / Wang, X L / Wang, Y / Wang, Y F / Wang, Y Z / Wang, Z M / Wei, D M / Wei, J J / Wei, Y F / Wen, S C / Wu, D / Wu, J / Wu, L B / Wu, S S / Wu, X / Xia, Z Q / Xu, H T / Xu, Z H / Xu, Z L / Xu, Z Z / Xue, G F / Yang, H B / Yang, P / Yang, Y Q / Yao, H J / Yu, Y H / Yuan, G W / Yuan, Q / Yue, C / Zang, J J / Zhang, F / Zhang, S X / Zhang, W Z / Zhang, Y / Zhang, Y J / Zhang, Y L / Zhang, Y P / Zhang, Y Q / Zhang, Z / Zhang, Z Y / Zhao, C / Zhao, H Y / Zhao, X F / Zhou, C Y / Zhu, Y

Physical review letters

2021 Volume 126, Issue 20, Page(s) 201102

Abstract: The measurement of the energy spectrum of cosmic ray helium nuclei from 70 GeV to 80 TeV using 4.5 years of data recorded by the Dark Matter Particle Explorer (DAMPE) is reported in this work. A hardening of the spectrum is observed at an energy of about ...

Abstract	The measurement of the energy spectrum of cosmic ray helium nuclei from 70 GeV to 80 TeV using 4.5 years of data recorded by the Dark Matter Particle Explorer (DAMPE) is reported in this work. A hardening of the spectrum is observed at an energy of about 1.3 TeV, similar to previous observations. In addition, a spectral softening at about 34 TeV is revealed for the first time with large statistics and well controlled systematic uncertainties, with an overall significance of 4.3σ. The DAMPE spectral measurements of both cosmic protons and helium nuclei suggest a particle charge dependent softening energy, although with current uncertainties a dependence on the number of nucleons cannot be ruled out.
Language	English
Publishing date	2021-06-05
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.126.201102
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Article ; Online: Unresolved Gamma-Ray Sky through its Angular Power Spectrum.

Ackermann, M / Ajello, M / Baldini, L / Ballet, J / Barbiellini, G / Bastieri, D / Bellazzini, R / Bissaldi, E / Blandford, R D / Bonino, R / Bottacini, E / Bregeon, J / Bruel, P / Buehler, R / Burns, E / Buson, S / Cameron, R A / Caputo, R / Caraveo, P A /

Cavazzuti, E / Chen, S / Chiaro, G / Ciprini, S / Costantin, D / Cuoco, A / Cutini, S / D'Ammando, F / de la Torre Luque, P / de Palma, F / Desai, A / Digel, S W / Di Lalla, N / Di Mauro, M / Di Venere, L / Fana Dirirsa, F / Favuzzi, C / Franckowiak, A / Fukazawa, Y / Funk, S / Fusco, P / Gargano, F / Gasparrini, D / Giglietto, N / Giordano, F / Giroletti, M / Green, D / Grenier, I A / Guillemot, L / Guiriec, S / Horan, D / Jóhannesson, G / Kuss, M / Larsson, S / Latronico, L / Li, J / Liodakis, I / Longo, F / Loparco, F / Lubrano, P / Magill, J D / Maldera, S / Malyshev, D / Manfreda, A / Mazziotta, M N / Mereu, I / Michelson, P F / Mitthumsiri, W / Mizuno, T / Monzani, M E / Morselli, A / Moskalenko, I V / Negro, M / Nuss, E / Orienti, M / Orlando, E / Palatiello, M / Paliya, V S / Paneque, D / Persic, M / Pesce-Rollins, M / Petrosian, V / Piron, F / Porter, T A / Principe, G / Rainò, S / Rando, R / Razzano, M / Razzaque, S / Reimer, A / Reimer, O / Serini, D / Sgrò, C / Siskind, E J / Spandre, G / Spinelli, P / Suson, D J / Tajima, H / Takahashi, M / Thayer, J B / Tibaldo, L / Torres, D F / Troja, E / Venters, T M / Vianello, G / Wood, K / Yassine, M / Zaharijas, G / Ammazzalorso, S / Fornengo, N / Regis, M

Physical review letters

2019 Volume 121, Issue 24, Page(s) 241101

Abstract: The gamma-ray sky has been observed with unprecedented accuracy in the last decade by the Fermi -large area telescope (LAT), allowing us to resolve and understand the high-energy Universe. The nature of the remaining unresolved emission [unresolved gamma- ...

Abstract	The gamma-ray sky has been observed with unprecedented accuracy in the last decade by the Fermi -large area telescope (LAT), allowing us to resolve and understand the high-energy Universe. The nature of the remaining unresolved emission [unresolved gamma-ray background (UGRB)] below the LAT source detection threshold can be uncovered by characterizing the amplitude and angular scale of the UGRB fluctuation field. This Letter presents a measurement of the UGRB autocorrelation angular power spectrum based on eight years of Fermi-LAT Pass 8 data products. The analysis is designed to be robust against contamination from resolved sources and noise systematics. The sensitivity to subthreshold sources is greatly enhanced with respect to previous measurements. We find evidence (with ∼3.7σ significance) that the scenario in which two classes of sources contribute to the UGRB signal is favored over a single class. A double power law with exponential cutoff can explain the anisotropy energy spectrum well, with photon indices of the two populations being 2.55±0.23 and 1.86±0.15.
Language	English
Publishing date	2019-01-04
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.121.241101
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Article ; Online: Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data.

Abdollahi, S / Ackermann, M / Ajello, M / Albert, A / Atwood, W B / Baldini, L / Barbiellini, G / Bellazzini, R / Bissaldi, E / Bloom, E D / Bonino, R / Bottacini, E / Brandt, T J / Bruel, P / Buson, S / Caragiulo, M / Cavazzuti, E / Chekhtman, A / Ciprini, S /

Costanza, F / Cuoco, A / Cutini, S / D'Ammando, F / de Palma, F / Desiante, R / Digel, S W / Di Lalla, N / Di Mauro, M / Di Venere, L / Donaggio, B / Drell, P S / Favuzzi, C / Focke, W B / Fukazawa, Y / Funk, S / Fusco, P / Gargano, F / Gasparrini, D / Giglietto, N / Giordano, F / Giroletti, M / Green, D / Guiriec, S / Harding, A K / Jogler, T / Jóhannesson, G / Kamae, T / Kuss, M / Larsson, S / Latronico, L / Li, J / Longo, F / Loparco, F / Lubrano, P / Magill, J D / Malyshev, D / Manfreda, A / Mazziotta, M N / Meehan, M / Michelson, P F / Mitthumsiri, W / Mizuno, T / Moiseev, A A / Monzani, M E / Morselli, A / Negro, M / Nuss, E / Ohsugi, T / Omodei, N / Paneque, D / Perkins, J S / Pesce-Rollins, M / Piron, F / Pivato, G / Principe, G / Rainò, S / Rando, R / Razzano, M / Reimer, A / Reimer, O / Sgrò, C / Simone, D / Siskind, E J / Spada, F / Spandre, G / Spinelli, P / Strong, A W / Tajima, H / Thayer, J B / Torres, D F / Troja, E / Vandenbroucke, J / Zaharijas, G / Zimmer, S

Physical review letters

2017 Volume 118, Issue 9, Page(s) 91103

Abstract: The Large Area Telescope on board the Fermi Gamma-ray Space Telescope has collected the largest ever sample of high-energy cosmic-ray electron and positron events since the beginning of its operation. Potential anisotropies in the arrival directions of ... ...

Abstract	The Large Area Telescope on board the Fermi Gamma-ray Space Telescope has collected the largest ever sample of high-energy cosmic-ray electron and positron events since the beginning of its operation. Potential anisotropies in the arrival directions of cosmic-ray electrons or positrons could be a signature of the presence of nearby sources. We use almost seven years of data with energies above 42 GeV processed with the Pass 8 reconstruction. The present data sample can probe dipole anisotropies down to a level of 10^{-3}. We take into account systematic effects that could mimic true anisotropies at this level. We present a detailed study of the event selection optimization of the cosmic-ray electrons and positrons to be used for anisotropy searches. Since no significant anisotropies have been detected on any angular scale, we present upper limits on the dipole anisotropy. The present constraints are among the strongest to date probing the presence of nearby young and middle-aged sources.
Language	English
Publishing date	2017-03-03
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.118.091103
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Article ; Online: Search for Spectral Irregularities due to Photon-Axionlike-Particle Oscillations with the Fermi Large Area Telescope.

Ajello, M / Albert, A / Anderson, B / Baldini, L / Barbiellini, G / Bastieri, D / Bellazzini, R / Bissaldi, E / Blandford, R D / Bloom, E D / Bonino, R / Bottacini, E / Bregeon, J / Bruel, P / Buehler, R / Caliandro, G A / Cameron, R A / Caragiulo, M / Caraveo, P A /

Cecchi, C / Chekhtman, A / Ciprini, S / Cohen-Tanugi, J / Conrad, J / Costanza, F / D'Ammando, F / de Angelis, A / de Palma, F / Desiante, R / Di Mauro, M / Di Venere, L / Domínguez, A / Drell, P S / Favuzzi, C / Focke, W B / Franckowiak, A / Fukazawa, Y / Funk, S / Fusco, P / Gargano, F / Gasparrini, D / Giglietto, N / Glanzman, T / Godfrey, G / Guiriec, S / Horan, D / Jóhannesson, G / Katsuragawa, M / Kensei, S / Kuss, M / Larsson, S / Latronico, L / Li, J / Li, L / Longo, F / Loparco, F / Lubrano, P / Madejski, G M / Maldera, S / Manfreda, A / Mayer, M / Mazziotta, M N / Meyer, M / Michelson, P F / Mirabal, N / Mizuno, T / Monzani, M E / Morselli, A / Moskalenko, I V / Murgia, S / Negro, M / Nuss, E / Okada, C / Orlando, E / Ormes, J F / Paneque, D / Perkins, J S / Pesce-Rollins, M / Piron, F / Pivato, G / Porter, T A / Rainò, S / Rando, R / Razzano, M / Reimer, A / Sánchez-Conde, M / Sgrò, C / Simone, D / Siskind, E J / Spada, F / Spandre, G / Spinelli, P / Takahashi, H / Thayer, J B / Torres, D F / Tosti, G / Troja, E / Uchiyama, Y / Wood, K S / Wood, M / Zaharijas, G / Zimmer, S

Physical review letters

2016 Volume 116, Issue 16, Page(s) 161101

Abstract: We report on the search for spectral irregularities induced by oscillations between photons and axionlike-particles (ALPs) in the γ-ray spectrum of NGC 1275, the central galaxy of the Perseus cluster. Using 6 years of Fermi Large Area Telescope data, we ... ...

Abstract	We report on the search for spectral irregularities induced by oscillations between photons and axionlike-particles (ALPs) in the γ-ray spectrum of NGC 1275, the central galaxy of the Perseus cluster. Using 6 years of Fermi Large Area Telescope data, we find no evidence for ALPs and exclude couplings above 5×10^{-12} GeV^{-1} for ALP masses 0.5≲m_{a}≲5 neV at 95% confidence. The limits are competitive with the sensitivity of planned laboratory experiments, and, together with other bounds, strongly constrain the possibility that ALPs can reduce the γ-ray opacity of the Universe.
Language	English
Publishing date	2016-04-22
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.116.161101
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Article ; Online: Measurement of the cosmic ray proton spectrum from 40 GeV to 100 TeV with the DAMPE satellite.

An, Q / Asfandiyarov, R / Azzarello, P / Bernardini, P / Bi, X J / Cai, M S / Chang, J / Chen, D Y / Chen, H F / Chen, J L / Chen, W / Cui, M Y / Cui, T S / Dai, H T / D'Amone, A / De Benedittis, A / De Mitri, I / Di Santo, M / Ding, M /

Dong, T K / Dong, Y F / Dong, Z X / Donvito, G / Droz, D / Duan, J L / Duan, K K / D'Urso, D / Fan, R R / Fan, Y Z / Fang, F / Feng, C Q / Feng, L / Fusco, P / Gallo, V / Gan, F J / Gao, M / Gargano, F / Gong, K / Gong, Y Z / Guo, D Y / Guo, J H / Guo, X L / Han, S X / Hu, Y M / Huang, G S / Huang, X Y / Huang, Y Y / Ionica, M / Jiang, W / Jin, X / Kong, J / Lei, S J / Li, S / Li, W L / Li, X / Li, X Q / Li, Y / Liang, Y F / Liang, Y M / Liao, N H / Liu, C M / Liu, H / Liu, J / Liu, S B / Liu, W Q / Liu, Y / Loparco, F / Luo, C N / Ma, M / Ma, P X / Ma, S Y / Ma, T / Ma, X Y / Marsella, G / Mazziotta, M N / Mo, D / Niu, X Y / Pan, X / Peng, W X / Peng, X Y / Qiao, R / Rao, J N / Salinas, M M / Shang, G Z / Shen, W H / Shen, Z Q / Shen, Z T / Song, J X / Su, H / Su, M / Sun, Z Y / Surdo, A / Teng, X J / Tykhonov, A / Vitillo, S / Wang, C / Wang, H / Wang, H Y / Wang, J Z / Wang, L G / Wang, Q / Wang, S / Wang, X H / Wang, X L / Wang, Y F / Wang, Y P / Wang, Y Z / Wang, Z M / Wei, D M / Wei, J J / Wei, Y F / Wen, S C / Wu, D / Wu, J / Wu, L B / Wu, S S / Wu, X / Xi, K / Xia, Z Q / Xu, H T / Xu, Z H / Xu, Z L / Xu, Z Z / Xue, G F / Yang, H B / Yang, P / Yang, Y Q / Yang, Z L / Yao, H J / Yu, Y H / Yuan, Q / Yue, C / Zang, J J / Zhang, F / Zhang, J Y / Zhang, J Z / Zhang, P F / Zhang, S X / Zhang, W Z / Zhang, Y / Zhang, Y J / Zhang, Y L / Zhang, Y P / Zhang, Y Q / Zhang, Z / Zhang, Z Y / Zhao, H / Zhao, H Y / Zhao, X F / Zhou, C Y / Zhou, Y / Zhu, X / Zhu, Y / Zimmer, S

Science advances

2019 Volume 5, Issue 9, Page(s) eaax3793

Abstract: The precise measurement of the spectrum of protons, the most abundant component of the cosmic radiation, is necessary to understand the source and acceleration of cosmic rays in the Milky Way. This work reports the measurement of the cosmic ray proton ... ...

Abstract	The precise measurement of the spectrum of protons, the most abundant component of the cosmic radiation, is necessary to understand the source and acceleration of cosmic rays in the Milky Way. This work reports the measurement of the cosmic ray proton fluxes with kinetic energies from 40 GeV to 100 TeV, with 2
Language	English
Publishing date	2019-09-27
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2810933-8
ISSN	2375-2548 ; 2375-2548
ISSN (online)	2375-2548
ISSN	2375-2548
DOI	10.1126/sciadv.aax3793
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Article: Measurement of the high-energy gamma-ray emission from the Moon with the Fermi Large Area Telescope.

Ackermann, M / Ajello, M / Albert, A / Atwood, W B / Baldini, L / Barbiellini, G / Bastieri, D / Bellazzini, R / Bissaldi, E / Blandford, R D / Bonino, R / Bottacini, E / Bregeon, J / Bruel, P / Buehler, R / Caliandro, G A / Cameron, R A / Caragiulo, M / Caraveo, P A /

Cavazzuti, E / Cecchi, C / Chekhtman, A / Chiang, J / Chiaro, G / Ciprini, S / Claus, R / Cohen-Tanugi, J / Costanza, F / Cuoco, A / Cutini, S / D'Ammando, F / de Angelis, A / de Palma, F / Desiante, R / Digel, S W / Di Venere, L / Drell, P S / Favuzzi, C / Fegan, S J / Focke, W B / Franckowiak, A / Funk, S / Fusco, P / Gargano, F / Gasparrini, D / Giglietto, N / Giordano, F / Giroletti, M / Glanzman, T / Godfrey, G / Grenier, I A / Grove, J E / Guiriec, S / Harding, A K / Hewitt, J W / Horan, D / Hou, X / Iafrate, G / Jóhannesson, G / Kamae, T / Kuss, M / Larsson, S / Latronico, L / Li, J / Li, L / Longo, F / Loparco, F / Lovellette, M N / Lubrano, P / Magill, J / Maldera, S / Manfreda, A / Mayer, M / Mazziotta, M N / Michelson, P F / Mitthumsiri, W / Mizuno, T / Monzani, M E / Morselli, A / Murgia, S / Nuss, E / Omodei, N / Orlando, E / Ormes, J F / Paneque, D / Perkins, J S / Pesce-Rollins, M / Petrosian, V / Piron, F / Pivato, G / Rainò, S / Rando, R / Razzano, M / Reimer, A / Reimer, O / Reposeur, T / Sgrò, C / Siskind, E J / Spada, F / Spandre, G / Spinelli, P / Takahashi, H / Thayer, J B / Thompson, D J / Tibaldo, L / Torres, D F / Tosti, G / Troja, E / Vianello, G / Winer, B L / Wood, K S / Yassine, M / Cerutti, F / Ferrari, A / Sala, P R

Physical review. D. (2016)

2016 Volume 93, Issue 8, Page(s) 82001

Abstract: We have measured the gamma-ray emission spectrum of the Moon using the data collected by the Large Area Telescope onboard the Fermi satellite during its first seven years of operation, in the energy range from 30 MeV up to a few GeV. We have also studied ...

Abstract	We have measured the gamma-ray emission spectrum of the Moon using the data collected by the Large Area Telescope onboard the Fermi satellite during its first seven years of operation, in the energy range from 30 MeV up to a few GeV. We have also studied the time evolution of the flux, finding a correlation with the solar activity. We have developed a full Monte Carlo simulation describing the interactions of cosmic rays with the lunar surface. The results of the present analysis can be explained in the framework of this model, where the production of gamma rays is due to the interactions of cosmic-ray proton and helium nuclei with the surface of the Moon. Finally, we have used our simulation to derive the cosmic-ray proton and helium spectra near Earth from the Moon gamma-ray data.
Language	English
Publishing date	2016-04-08
Publishing country	United States
Document type	Journal Article
ZDB-ID	209772-2
ISSN	2470-0010 ; 0556-2821 ; 1550-7998
ISSN	2470-0010 ; 0556-2821 ; 1550-7998
DOI	10.1103/PhysRevD.93.082001
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Resolving the Extragalactic γ-Ray Background above 50 GeV with the Fermi Large Area Telescope.

Ackermann, M / Ajello, M / Albert, A / Atwood, W B / Baldini, L / Ballet, J / Barbiellini, G / Bastieri, D / Bechtol, K / Bellazzini, R / Bissaldi, E / Blandford, R D / Bloom, E D / Bonino, R / Bregeon, J / Britto, R J / Bruel, P / Buehler, R / Caliandro, G A /

Cameron, R A / Caragiulo, M / Caraveo, P A / Cavazzuti, E / Cecchi, C / Charles, E / Chekhtman, A / Chiang, J / Chiaro, G / Ciprini, S / Cohen-Tanugi, J / Cominsky, L R / Costanza, F / Cutini, S / D'Ammando, F / de Angelis, A / de Palma, F / Desiante, R / Digel, S W / Di Mauro, M / Di Venere, L / Domínguez, A / Drell, P S / Favuzzi, C / Fegan, S J / Ferrara, E C / Franckowiak, A / Fukazawa, Y / Funk, S / Fusco, P / Gargano, F / Gasparrini, D / Giglietto, N / Giommi, P / Giordano, F / Giroletti, M / Godfrey, G / Green, D / Grenier, I A / Guiriec, S / Hays, E / Horan, D / Iafrate, G / Jogler, T / Jóhannesson, G / Kuss, M / La Mura, G / Larsson, S / Latronico, L / Li, J / Li, L / Longo, F / Loparco, F / Lott, B / Lovellette, M N / Lubrano, P / Madejski, G M / Magill, J / Maldera, S / Manfreda, A / Mayer, M / Mazziotta, M N / Michelson, P F / Mitthumsiri, W / Mizuno, T / Moiseev, A A / Monzani, M E / Morselli, A / Moskalenko, I V / Murgia, S / Negro, M / Nuss, E / Ohsugi, T / Okada, C / Omodei, N / Orlando, E / Ormes, J F / Paneque, D / Perkins, J S / Pesce-Rollins, M / Petrosian, V / Piron, F / Pivato, G / Porter, T A / Rainò, S / Rando, R / Razzano, M / Razzaque, S / Reimer, A / Reimer, O / Reposeur, T / Romani, R W / Sánchez-Conde, M / Schmid, J / Schulz, A / Sgrò, C / Simone, D / Siskind, E J / Spada, F / Spandre, G / Spinelli, P / Suson, D J / Takahashi, H / Thayer, J B / Tibaldo, L / Torres, D F / Troja, E / Vianello, G / Yassine, M / Zimmer, S

Physical review letters

2016 Volume 116, Issue 15, Page(s) 151105

Abstract: The Fermi Large Area Telescope (LAT) Collaboration has recently released a catalog of 360 sources detected above 50 GeV (2FHL). This catalog was obtained using 80 months of data re-processed with Pass 8, the newest event-level analysis, which ... ...

Abstract	The Fermi Large Area Telescope (LAT) Collaboration has recently released a catalog of 360 sources detected above 50 GeV (2FHL). This catalog was obtained using 80 months of data re-processed with Pass 8, the newest event-level analysis, which significantly improves the acceptance and angular resolution of the instrument. Most of the 2FHL sources at high Galactic latitude are blazars. Using detailed Monte Carlo simulations, we measure, for the first time, the source count distribution, dN/dS, of extragalactic γ-ray sources at E>50 GeV and find that it is compatible with a Euclidean distribution down to the lowest measured source flux in the 2FHL (∼8×10^{-12} ph cm^{-2} s^{-1}). We employ a one-point photon fluctuation analysis to constrain the behavior of dN/dS below the source detection threshold. Overall, the source count distribution is constrained over three decades in flux and found compatible with a broken power law with a break flux, S_{b}, in the range [8×10^{-12},1.5×10^{-11}] ph cm^{-2} s^{-1} and power-law indices below and above the break of α_{2}∈[1.60,1.75] and α_{1}=2.49±0.12, respectively. Integration of dN/dS shows that point sources account for at least 86_{-14}^{+16}% of the total extragalactic γ-ray background. The simple form of the derived source count distribution is consistent with a single population (i.e., blazars) dominating the source counts to the minimum flux explored by this analysis. We estimate the density of sources detectable in blind surveys that will be performed in the coming years by the Cherenkov Telescope Array.
Language	English
Publishing date	2016--15
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.116.151105
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi Large Area Telescope Data.

Ackermann, M / Albert, A / Anderson, B / Atwood, W B / Baldini, L / Barbiellini, G / Bastieri, D / Bechtol, K / Bellazzini, R / Bissaldi, E / Blandford, R D / Bloom, E D / Bonino, R / Bottacini, E / Brandt, T J / Bregeon, J / Bruel, P / Buehler, R / Caliandro, G A /

Cameron, R A / Caputo, R / Caragiulo, M / Caraveo, P A / Cecchi, C / Charles, E / Chekhtman, A / Chiang, J / Chiaro, G / Ciprini, S / Claus, R / Cohen-Tanugi, J / Conrad, J / Cuoco, A / Cutini, S / D'Ammando, F / de Angelis, A / de Palma, F / Desiante, R / Digel, S W / Di Venere, L / Drell, P S / Drlica-Wagner, A / Essig, R / Favuzzi, C / Fegan, S J / Ferrara, E C / Focke, W B / Franckowiak, A / Fukazawa, Y / Funk, S / Fusco, P / Gargano, F / Gasparrini, D / Giglietto, N / Giordano, F / Giroletti, M / Glanzman, T / Godfrey, G / Gomez-Vargas, G A / Grenier, I A / Guiriec, S / Gustafsson, M / Hays, E / Hewitt, J W / Horan, D / Jogler, T / Jóhannesson, G / Kuss, M / Larsson, S / Latronico, L / Li, J / Li, L / Llena Garde, M / Longo, F / Loparco, F / Lubrano, P / Malyshev, D / Mayer, M / Mazziotta, M N / McEnery, J E / Meyer, M / Michelson, P F / Mizuno, T / Moiseev, A A / Monzani, M E / Morselli, A / Murgia, S / Nuss, E / Ohsugi, T / Orienti, M / Orlando, E / Ormes, J F / Paneque, D / Perkins, J S / Pesce-Rollins, M / Piron, F / Pivato, G / Porter, T A / Rainò, S / Rando, R / Razzano, M / Reimer, A / Reimer, O / Ritz, S / Sánchez-Conde, M / Schulz, A / Sehgal, N / Sgrò, C / Siskind, E J / Spada, F / Spandre, G / Spinelli, P / Strigari, L / Tajima, H / Takahashi, H / Thayer, J B / Tibaldo, L / Torres, D F / Troja, E / Vianello, G / Werner, M / Winer, B L / Wood, K S / Wood, M / Zaharijas, G / Zimmer, S

Physical review letters

2015 Volume 115, Issue 23, Page(s) 231301

Abstract: The dwarf spheroidal satellite galaxies (dSphs) of the Milky Way are some of the most dark matter (DM) dominated objects known. We report on γ-ray observations of Milky Way dSphs based on six years of Fermi Large Area Telescope data processed with the ... ...

Abstract	The dwarf spheroidal satellite galaxies (dSphs) of the Milky Way are some of the most dark matter (DM) dominated objects known. We report on γ-ray observations of Milky Way dSphs based on six years of Fermi Large Area Telescope data processed with the new Pass8 event-level analysis. None of the dSphs are significantly detected in γ rays, and we present upper limits on the DM annihilation cross section from a combined analysis of 15 dSphs. These constraints are among the strongest and most robust to date and lie below the canonical thermal relic cross section for DM of mass ≲100 GeV annihilating via quark and τ-lepton channels.
Language	English
Publishing date	2015-12-04
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.115.231301
Database	MEDical Literature Analysis and Retrieval System OnLINE

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