Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..119c&link_type=abstract
SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.
Astronomy and Astrophysics
Astrophysics
Scientific paper
We report high-energy spectral results on Cygnus X-1 obtained with INTEGRAL which extensively observed this confirmed black hole from 2002 November to 2004, collecting a total of 1.5 Ms of data. We compare the spectral properties of the source in three distinct observed spectral states (hard, soft and intermediate) over the 5 keV--1 MeV energy range. Spectral changes in the hard and soft components occur together with Fe line and reflection evolutions. Our results give new insights on the physical changes that took place in the system (disc and corona) at almost constant luminosity during spectral transitions. In particular, we observed in 2003 June a high-energy tail at several hundred keV in excess of the thermal Comptonization model suggesting the presence of an additional non-thermal component.
Cadolle Bel Marion
Goldoni Paolo
Goldwurm Andréa
Jourdain Elisabeth
Laurent Pascal
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