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. 2009 Dec 11;326(5959):1512-6.
doi: 10.1126/science.1182174.

Modulated high-energy gamma-ray emission from the microquasar Cygnus X-3

Fermi LAT Collaboration; A A Abdo, M Ackermann, M Ajello, M Axelsson, L Baldini, J Ballet, G Barbiellini, D Bastieri, B M Baughman, K Bechtol, R Bellazzini, B Berenji, R D Blandford, E D Bloom, E Bonamente, A W Borgland, A Brez, M Brigida, P Bruel, T H Burnett, S Buson, G A Caliandro, R A Cameron, P A Caraveo, J M Casandjian, C Cecchi, O Celik, S Chaty, C C Cheung, J Chiang, S Ciprini, R Claus, J Cohen-Tanugi, L R Cominsky, J Conrad, S Corbel, R Corbet, C D Dermer, F de Palma, S W Digel, E do Couto e Silva, P S Drell, R Dubois, G Dubus, D Dumora, C Farnier, C Favuzzi, S J Fegan, W B Focke, P Fortin, M Frailis, P Fusco, F Gargano, N Gehrels, S Germani, G Giavitto, B Giebels, N Giglietto, F Giordano, T Glanzman, G Godfrey, I A Grenier, M-H Grondin, J E Grove, L Guillemot, S Guiriec, Y Hanabata, A K Harding, M Hayashida, E Hays, A B Hill, L Hjalmarsdotter, D Horan, R E Hughes, M S Jackson, G Jóhannesson, A S Johnson, T J Johnson, W N Johnson, T Kamae, H Katagiri, N Kawai, M Kerr, J Knödlseder, M L Kocian, E Koerding, M Kuss, J Lande, L Latronico, M Lemoine-Goumard, F Longo, F Loparco, B Lott, M N Lovellette, P Lubrano, G M Madejski, A Makeev, L Marchand, M Marelli, W Max-Moerbeck, M N Mazziotta, N McColl, J E McEnery, C Meurer, P F Michelson, S Migliari, W Mitthumsiri, T Mizuno, C Monte, M E Monzani, A Morselli, I V Moskalenko, S Murgia, P L Nolan, J P Norris, E Nuss, T Ohsugi, N Omodei, R A Ong, J F Ormes, D Paneque, D Parent, V Pelassa, M Pepe, M Pesce-Rollins, F Piron, G Pooley, T A Porter, K Pottschmidt, S Rainò, R Rando, P S Ray, M Razzano, N Rea, A Readhead, A Reimer, O Reimer, J L Richards, L S Rochester, J Rodriguez, A Y Rodriguez, R W Romani, F Ryde, H F-W Sadrozinski, A Sander, P M Saz Parkinson, C Sgrò, E J Siskind, D A Smith, P D Smith, P Spinelli, J-L Starck, M Stevenson, M S Strickman, D J Suson, H Takahashi, T Tanaka, J B Thayer, D J Thompson, L Tibaldo, J A Tomsick, D F Torres, G Tosti, A Tramacere, Y Uchiyama, T L Usher, V Vasileiou, N Vilchez, V Vitale, A P Waite, P Wang, J Wilms, B L Winer, K S Wood, T Ylinen, M Ziegler

Modulated high-energy gamma-ray emission from the microquasar Cygnus X-3

Fermi LAT Collaboration et al. Science. .

Abstract

Microquasars are accreting black holes or neutron stars in binary systems with associated relativistic jets. Despite their frequent outburst activity, they have never been unambiguously detected emitting high-energy gamma rays. The Fermi Large Area Telescope (LAT) has detected a variable high-energy source coinciding with the position of the x-ray binary and microquasar Cygnus X-3. Its identification with Cygnus X-3 is secured by the detection of its orbital period in gamma rays, as well as the correlation of the LAT flux with radio emission from the relativistic jets of Cygnus X-3. The gamma-ray emission probably originates from within the binary system, opening new areas in which to study the formation of relativistic jets.

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