Aims. We probe the high-energy (>60 MeV) emission from the black hole X-ray binary system, Cygnus X-1, and investigate its origin. Methods. We analyzed 7.5 yr of data by Fermi-LAT with the latest Pass 8 software version. Results. We report the detection of a signal at ~8σ statistical significance that is spatially coincident with Cygnus X-1 and has a luminosity of 5.5 × 1033 erg s-1, above 60 MeV. The signal is correlated with the hard X-ray flux: the source is observed at high energies only during the hard X-ray spectral state, when the source is known to display persistent, relativistic radio-emitting jets. The energy spectrum, extending up to ~20 GeV without any sign of spectral break, is well fit by a power-law function with a photon in...
We show that the jet power P_j and geometrically corrected \gamma-ray luminosity L_\gamma for the X-...
We report on the results from the observations in the very high energy band (VHE; Eγ>=100 GeV) of th...
International audienceContext. 0.1–10 MeV observations of the black hole microquasar Cygnus X-1 have...
Aims. We probe the high-energy (>60 MeV) emission from the black hole X-ray binary system, Cygnus X-...
Cygnus X1 is the prototype black hole high-mass microquasar. As a persistent and bright X-ray source...
Context. Cygnus X-1 is a well-observed microquasar. Broadband observations at all wavelengths have b...
The microquasar Cygnus X-1 displays the two typical soft and hard X-ray states of a black hole trans...
The microquasar Cygnus X-1 displays the two typical soft and hard X-ray states of a black hole trans...
The microquasar Cygnus X-1 displays the two typical soft and hard X-ray states of a black-hole trans...
4 pages, 3 figures, Proceedings of the SF2A conference held in Marseille, 21-24 June 2010Cygnus X-3 ...
Recurrent flaring events at X- and soft gamma-ray energies have been recently reported for the galac...
Microquasars are accreting black holes or neutron stars in binary systems with associated relativist...
We report on Fermi/Large Area Telescope observations of the accreting black hole low-mass X-ray bina...
We show that the jet power P_j and geometrically corrected \gamma-ray luminosity L_\gamma for the X-...
We report on the results from the observations in the very high energy band (VHE; Eγ>=100 GeV) of th...
International audienceContext. 0.1–10 MeV observations of the black hole microquasar Cygnus X-1 have...
Aims. We probe the high-energy (>60 MeV) emission from the black hole X-ray binary system, Cygnus X-...
Cygnus X1 is the prototype black hole high-mass microquasar. As a persistent and bright X-ray source...
Context. Cygnus X-1 is a well-observed microquasar. Broadband observations at all wavelengths have b...
The microquasar Cygnus X-1 displays the two typical soft and hard X-ray states of a black hole trans...
The microquasar Cygnus X-1 displays the two typical soft and hard X-ray states of a black hole trans...
The microquasar Cygnus X-1 displays the two typical soft and hard X-ray states of a black-hole trans...
4 pages, 3 figures, Proceedings of the SF2A conference held in Marseille, 21-24 June 2010Cygnus X-3 ...
Recurrent flaring events at X- and soft gamma-ray energies have been recently reported for the galac...
Microquasars are accreting black holes or neutron stars in binary systems with associated relativist...
We report on Fermi/Large Area Telescope observations of the accreting black hole low-mass X-ray bina...
We show that the jet power P_j and geometrically corrected \gamma-ray luminosity L_\gamma for the X-...
We report on the results from the observations in the very high energy band (VHE; Eγ>=100 GeV) of th...
International audienceContext. 0.1–10 MeV observations of the black hole microquasar Cygnus X-1 have...