The broad-band spectrum of Cygnus X-1 measured by INTEGRAL

Details The broad-band spectrum of Cygnus X-1 measured by INTEGRAL The broad-band spectrum of Cygnus X-1 measured by INTEGRAL

2005-09-28

arxiv.org/abs/astro-ph/0509851v2

Astronomy and Astrophysics

Astrophysics

accepted for publication in A&A, 13 pages, 9 figures (3 in colour)

Scientific paper

10.1051/0004-6361:20053068

The INTEGRAL satellite extensively observed the black hole binary Cygnus X-1 from 2002 November to 2004 November during calibration, open time and core program (Galactic Plane Scan) observations. These data provide evidence for significant spectral variations over the period. In the framework of the accreting black hole phenomenology, the source was most of the time in the Hard State and occasionally switched to the so-called "Intermediate State". Using the results of the analysis performed on these data, we present and compare the spectral properties of the source over the whole energy range (5 keV - 1 MeV) covered by the high-energy instruments on board INTEGRAL, in both observed spectral states. Fe line and reflection component evolution occurs with spectral changes in the hard and soft components. The observed behaviour of Cygnus X-1 is consistent with the general picture of galactic black holes. Our results give clues to the physical changes that took place in the system (disc and corona) at almost constant luminosity during the spectral transitions and provide new measures of the spectral model parameters. In particular, during the Intermediate State of 2003 June, we observe in the Cygnus X-1 data a high-energy tail at several hundred keV in excess of the thermal Comptonization model which suggests the presence of an additional non-thermal component.

Affiliated with

Also associated with

No associations

Rating

The broad-band spectrum of Cygnus X-1 measured by INTEGRAL does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The broad-band spectrum of Cygnus X-1 measured by INTEGRAL, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The broad-band spectrum of Cygnus X-1 measured by INTEGRAL will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-239413