Authors
AA ea Abdo, Markus Ackermann, Marco Ajello, WB Atwood, Magnus Axelsson, Luca Baldini, Jean Ballet, Guido Barbiellini, Denis Bastieri, K Bechtol, R Bellazzini, B Berenji, RD Blandford, ED Bloom, Emanuele Bonamente, AW Borgland, J Bregeon, A Brez, M Brigida, Pascal Bruel, TH Burnett, GA Caliandro, RA Cameron, A Cannon, PA Caraveo, JM Casandjian, E Cavazzuti, Claudia Cecchi, Ö Çelik, E Charles, CC Cheung, J Chiang, S Ciprini, R Claus, J Cohen-Tanugi, S Colafrancesco, J Conrad, L Costamante, S Cutini, DS Davis, CD Dermer, Alessandro de Angelis, F De Palma, SW Digel, D Donato, E do Couto e Silva, PS Drell, R Dubois, D Dumora, Y Edmonds, C Farnier, C Favuzzi, SJ Fegan, J Finke, WB Focke, P Fortin, M Frailis, Y Fukazawa, S Funk, Piergiorgio Fusco, F Gargano, D Gasparrini, N Gehrels, M Georganopoulos, S Germani, B Giebels, N Giglietto, P Giommi, Francesco Giordano, M Giroletti, T Glanzman, G Godfrey, IA Grenier, M-H Grondin, JE Grove, L Guillemot, S Guiriec, Y Hanabata, AK Harding, M Hayashida, E Hays, D Horan, G Jóhannesson, AS Johnson, RP Johnson, TJ Johnson, WN Johnson, T Kamae, H Katagiri, J Kataoka, N Kawai, M Kerr, Jürgen Knödlseder, ML Kocian, M Kuss, J Lande, L Latronico, M Lemoine-Goumard, Francesco Longo, Francesco Loparco, B Lott, MN Lovellette, P Lubrano, GM Madejski, A Makeev, MN Mazziotta, W McConville, JE McEnery, C Meurer, PF Michelson, W Mitthumsiri, T Mizuno, AA Moiseev, C Monte, ME Monzani, A Morselli, IV Moskalenko, S Murgia, PL Nolan, JP Norris, E Nuss, T Ohsugi, N Omodei, E Orlando, JF Ormes, M Ozaki, D Paneque, JH Panetta, D Parent, V Pelassa, M Pepe, M Pesce-Rollins, F Piron, TA Porter, Silvia Raino, Riccardo Rando, Massimiliano Razzano, A Reimer, O Reimer, T Reposeur, S Ritz, LS Rochester, AY Rodriguez, RW Romani, M Roth, F Ryde, HF-W Sadrozinski, R Sambruna, D Sanchez, A Sander
Publication date
2009/11/17
Journal
The Astrophysical Journal
Volume
707
Issue
1
Pages
55
Publisher
IOP Publishing
Description
We report the Fermi Large Area Telescope (LAT) discovery of high-energy (MeV/GeV) γ-ray emission positionally consistent with the center of the radio galaxy M87, at a source significance of over 10σ in 10 months of all-sky survey data. Following the detections of Cen A and Per A, this makes M87 the third radio galaxy seen with the LAT. The faint point-like γ-ray source has a> 100 MeV flux of 2.45 (±0.63)× 10− 8 photons cm− 2 s− 1 (photon index= 2.26±0.13) with no significant variability detected within the LAT observation. This flux is comparable with the previous EGRET upper limit (< 2.18× 10− 8 photons cm− 2 s− 1, 2σ), thus there is no evidence for a significant MeV/GeV flare on decade timescales. Contemporaneous Chandra and Very Long Baseline Array data indicate low activity in the unresolved X-ray and radio core relative to previous observations, suggesting M87 is in a quiescent overall level over the …
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Scholar articles
AA Abdo, M Ackermann, M Ajello, WB Atwood… - The Astrophysical Journal, 2009