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EARLY FERMI GAMMA-R...
EARLY FERMI GAMMA-RAY SPACE TELESCOPE OBSERVATIONS OF THE QUASAR 3C 454.3
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Abdo, A. A. (author)
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Ackermann, M. (author)
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Ajello, M. (author)
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show more...
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Atwood, W. B. (author)
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- Axelsson, M. (author)
- Stockholms universitet,Institutionen för astronomi
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Baldini, L. (author)
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Ballet, J. (author)
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Barbiellini, G. (author)
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Bastieri, D. (author)
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- Battelino, Milan (author)
- KTH,Partikel- och astropartikelfysik
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Baughman, B. M. (author)
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Bechtol, K. (author)
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Bellazzini, R. (author)
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Berenji, B. (author)
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Blandford, R. D. (author)
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Bloom, E. D. (author)
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Bonamente, E. (author)
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Borgland, A. W. (author)
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Bouvier, A. (author)
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Bregeon, J. (author)
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Brez, A. (author)
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Brigida, M. (author)
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Bruel, P. (author)
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Burnett, T. H. (author)
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Caliandro, G. A. (author)
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Cameron, R. A. (author)
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Caraveo, P. A. (author)
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Casandjian, J. M. (author)
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Cavazzuti, E. (author)
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Cecchi, C. (author)
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Charles, E. (author)
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Chaty, S. (author)
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Chekhtman, A. (author)
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Cheung, C. C. (author)
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Chiang, J. (author)
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Ciprini, S. (author)
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Claus, R. (author)
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Cohen-Tanugi, J. (author)
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Cominsky, L. R. (author)
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- Conrad, Jan (author)
- KTH,Stockholms universitet,Fysikum,Partikel- och astropartikelfysik
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Costamante, L. (author)
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Cutini, S. (author)
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Dermer, C. D. (author)
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de Angelis, A. (author)
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de Palma, F. (author)
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Digel, S. W. (author)
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Silva, E. D. E. (author)
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Donato, D. (author)
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Drell, P. S. (author)
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Dubois, R. (author)
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Dumora, D. (author)
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Farnier, C. (author)
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Favuzzi, C. (author)
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Focke, W. B. (author)
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Foschini, L. (author)
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Frailis, M. (author)
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Fuhrmann, L. (author)
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Fukazawa, Y. (author)
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Funk, S. (author)
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Fusco, P. (author)
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Gargano, F. (author)
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Gasparrini, D. (author)
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Gehrels, N. (author)
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Germani, S. (author)
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Giebels, B. (author)
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Giglietto, N. (author)
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Giommi, P. (author)
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Giordano, F. (author)
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Glanzman, T. (author)
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Godfrey, G. (author)
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Grenier, I. A. (author)
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Grondin, M. H. (author)
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Grove, J. E. (author)
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Guillemot, L. (author)
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Guiriec, S. (author)
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Hanabata, Y. (author)
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Harding, A. K. (author)
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Hartman, R. C. (author)
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Hayashida, M. (author)
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Hays, E. (author)
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Hughes, R. E. (author)
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Johannesson, G. (author)
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Johnson, A. S. (author)
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Johnson, R. P. (author)
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Johnson, W. N. (author)
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Kamae, T. (author)
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Katagiri, H. (author)
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Kataoka, J. (author)
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Kawai, N. (author)
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Kerr, M. (author)
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Knodlseder, J. (author)
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Kocian, M. L. (author)
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Kuehn, F. (author)
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Kuss, M. (author)
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Latronico, L. (author)
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Lee, S. H. (author)
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Lemoine-Goumard, M. (author)
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Longo, F. (author)
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Loparco, F. (author)
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Lott, B. (author)
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Lovellette, M. N. (author)
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Lubrano, P. (author)
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Madejski, G. M. (author)
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Makeev, A. (author)
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Massaro, E. (author)
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Mazziotta, M. N. (author)
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McEnery, J. E. (author)
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- McGlynn, Sinéad (author)
- KTH,Partikel- och astropartikelfysik
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- Meurer, C. (author)
- Stockholms universitet,Fysikum
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Michelson, P. F. (author)
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Mitthumsiri, W. (author)
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Mizuno, T. (author)
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Moiseev, A. A. (author)
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Monte, C. (author)
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Monzani, M. E. (author)
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Morselli, A. (author)
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Moskalenko, I. V. (author)
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Murgia, S. (author)
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Nolan, P. L. (author)
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Norris, J. P. (author)
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Nuss, E. (author)
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Ohsugi, T. (author)
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Omodei, N. (author)
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Orlando, E. (author)
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Ormes, J. F. (author)
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Paneque, D. (author)
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Panetta, J. H. (author)
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Parent, D. (author)
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Pelassa, V. (author)
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Pepe, M. (author)
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Pesce-Rollins, M. (author)
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Piron, F. (author)
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Porter, T. A. (author)
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Raino, S. (author)
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Rando, R. (author)
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Razzano, M. (author)
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Reimer, A. (author)
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Reimer, O. (author)
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Reposeur, T. (author)
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Reyes, L. C. (author)
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Ritz, S. (author)
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Rochester, L. S. (author)
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Rodriguez, A. Y. (author)
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Rahoui, F. (author)
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- Ryde, Felix (author)
- KTH,Partikel- och astropartikelfysik
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Sadrozinski, H. F. W. (author)
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Sambruna, R. (author)
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Sanchez, D. (author)
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Sander, A. (author)
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Parkinson, P. M. S. (author)
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Sgro, C. (author)
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Shaw, M. S. (author)
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Smith, D. A. (author)
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Smith, P. D. (author)
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Spandre, G. (author)
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Spinelli, P. (author)
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Starck, J. L. (author)
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Strickman, M. S. (author)
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Suson, D. J. (author)
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Tajima, H. (author)
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Takahashi, H. (author)
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- Ylinen, T. (author)
- Högskolan i Kalmar,Naturvetenskapliga institutionen
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Tanaka, T. (author)
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Thayer, J. B. (author)
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Thayer, J. G. (author)
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Thompson, D. J. (author)
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Tibaldo, L. (author)
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Torres, D. F. (author)
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Tosti, G. (author)
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Tramacere, A. (author)
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Uchiyama, Y. (author)
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Usher, T. L. (author)
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Vilchez, N. (author)
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Villata, M. (author)
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Vitale, V. (author)
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Waite, A. P. (author)
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Winer, B. L. (author)
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Wood, K. S. (author)
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- Ylinen, T. (author)
- KTH,Högskolan i Kalmar,Naturvetenskapliga institutionen,Partikel- och astropartikelfysik
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Zensus, J. A. (author)
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Ziegler, M. (author)
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(creator_code:org_t)
- 2009
- 2009
- English.
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In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 699:1, s. 817-823
- Related links:
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https://urn.kb.se/re...
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show more...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://urn.kb.se/re...
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Abstract
Subject headings
Close
- This is the first report of Fermi Gamma-Ray Space Telescope observations of the quasar 3C 454.3, which has been undergoing pronounced long-term outbursts since 2000. The data from the Large Area Telescope, covering 2008 July 7-October 6, indicate strong, highly variable.-ray emission with an average flux of similar to 3 x 10 (6) photons cm(-2) s(-1), for energies > 100 MeV. The gamma-ray flux is variable, with strong, distinct, symmetrically shaped flares for which the flux increases by a factor of several on a timescale of about 3 days. This variability indicates a compact emission region, and the requirement that the source is optically thin to pair production implies relativistic beaming with Doppler factor delta > 8, consistent with the values inferred from Very Long Baseline Interferometry observations of superluminal expansion (delta similar to 25). The observed gamma-ray spectrum is not consistent with a simple power law, but instead steepens strongly above similar to 2 GeV, and is well described by a broken power law with photon indices of similar to 2.3 and similar to 3.5 below and above the break, respectively. This is the first direct observation of a break in the spectrum of a high-luminosity blazar above 100 MeV, and it is likely direct evidence for an intrinsic break in the energy distribution of the radiating particles. Alternatively, the spectral softening above 2 GeV could be due to gamma-ray absorption via photon-photon pair production on the soft X-ray photon field of the host active galactic nucleus, but such an interpretation would require the dissipation region to be located very close (less than or similar to 100 gravitational radii) to the black hole, which would be inconsistent with the X-ray spectrum of the source.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Fysik
- Physics
- galaxies: active
- Extragalactical astronomy
- High energy astrophysics
- Astronomy
- Astronomy and astrophysics
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
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Abdo, A. A.
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Ackermann, M.
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Ajello, M.
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Atwood, W. B.
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Axelsson, M.
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Baldini, L.
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show more...
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Ballet, J.
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Barbiellini, G.
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Bastieri, D.
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Battelino, Milan
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Baughman, B. M.
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Bechtol, K.
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Bellazzini, R.
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Berenji, B.
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Blandford, R. D.
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Bloom, E. D.
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Bonamente, E.
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Borgland, A. W.
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Bouvier, A.
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Bregeon, J.
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Brez, A.
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Brigida, M.
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Bruel, P.
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Burnett, T. H.
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Caliandro, G. A.
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Cameron, R. A.
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Caraveo, P. A.
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Casandjian, J. M ...
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Cavazzuti, E.
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Cecchi, C.
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Charles, E.
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Chaty, S.
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Chekhtman, A.
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Cheung, C. C.
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Chiang, J.
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Ciprini, S.
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Claus, R.
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Cohen-Tanugi, J.
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Cominsky, L. R.
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Conrad, Jan
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Costamante, L.
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Cutini, S.
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Dermer, C. D.
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de Angelis, A.
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de Palma, F.
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Digel, S. W.
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Silva, E. D. E.
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Donato, D.
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Drell, P. S.
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Dubois, R.
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Dumora, D.
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Farnier, C.
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Favuzzi, C.
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Focke, W. B.
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Foschini, L.
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Frailis, M.
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Fuhrmann, L.
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Fukazawa, Y.
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Funk, S.
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Fusco, P.
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Gargano, F.
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Gasparrini, D.
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Gehrels, N.
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Germani, S.
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Giebels, B.
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Giglietto, N.
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Giommi, P.
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Giordano, F.
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Glanzman, T.
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Godfrey, G.
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Grenier, I. A.
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Grondin, M. H.
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Grove, J. E.
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Guillemot, L.
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Guiriec, S.
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Hanabata, Y.
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Harding, A. K.
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Hartman, R. C.
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Hayashida, M.
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Hays, E.
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Hughes, R. E.
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Johannesson, G.
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Johnson, A. S.
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Johnson, R. P.
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Johnson, W. N.
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Kamae, T.
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Katagiri, H.
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Kataoka, J.
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Kawai, N.
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Kerr, M.
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Knodlseder, J.
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Kocian, M. L.
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Kuehn, F.
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Kuss, M.
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Latronico, L.
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Lee, S. H.
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Lemoine-Goumard, ...
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Longo, F.
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Loparco, F.
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Lott, B.
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Lovellette, M. N ...
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Lubrano, P.
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Madejski, G. M.
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Makeev, A.
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Massaro, E.
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Mazziotta, M. N.
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McEnery, J. E.
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McGlynn, Sinéad
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Meurer, C.
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Michelson, P. F.
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Mitthumsiri, W.
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Mizuno, T.
-
Moiseev, A. A.
-
Monte, C.
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Monzani, M. E.
-
Morselli, A.
-
Moskalenko, I. V ...
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Murgia, S.
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Nolan, P. L.
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Norris, J. P.
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Nuss, E.
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Ohsugi, T.
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Omodei, N.
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Orlando, E.
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Ormes, J. F.
-
Paneque, D.
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Panetta, J. H.
-
Parent, D.
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Pelassa, V.
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Pepe, M.
-
Pesce-Rollins, M ...
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Piron, F.
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Porter, T. A.
-
Raino, S.
-
Rando, R.
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Razzano, M.
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Reimer, A.
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Reimer, O.
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Reposeur, T.
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Reyes, L. C.
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Ritz, S.
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Rochester, L. S.
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Rodriguez, A. Y.
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Rahoui, F.
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Ryde, Felix
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Sadrozinski, H. ...
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Sambruna, R.
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Sanchez, D.
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Sander, A.
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Parkinson, P. M. ...
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Sgro, C.
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Shaw, M. S.
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Smith, D. A.
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Smith, P. D.
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Spandre, G.
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Spinelli, P.
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Starck, J. L.
-
Strickman, M. S.
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Suson, D. J.
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Tajima, H.
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Takahashi, H.
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Ylinen, T.
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Tanaka, T.
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Thayer, J. B.
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Thayer, J. G.
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Thompson, D. J.
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Tibaldo, L.
-
Torres, D. F.
-
Tosti, G.
-
Tramacere, A.
-
Uchiyama, Y.
-
Usher, T. L.
-
Vilchez, N.
-
Villata, M.
-
Vitale, V.
-
Waite, A. P.
-
Winer, B. L.
-
Wood, K. S.
-
Zensus, J. A.
-
Ziegler, M.
-
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- By the university
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Linnaeus University
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Stockholm University
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Royal Institute of Technology