The broad-band spectrum of Cyg X-2 with INTEGRAL

Details The broad-band spectrum of Cyg X-2 with INTEGRAL The broad-band spectrum of Cyg X-2 with INTEGRAL

2005-10-12

arxiv.org/abs/astro-ph/0510340v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures; Accepted for publication as a Research Note on A&A

Scientific paper

10.1051/0004-6361:20053189

We study the broad band (3-100 keV) spectrum of Cygnus X-2 with INTEGRAL. We find that the spectrum is well fitted by a Comptonized component with a seed-photons temperature of ~1 keV, an electron temperature of ~3 keV and an optical depth tau ~ 8. Assuming spherical geometry, the radius of the seed-photons emitting region is ~17 km. The source shows no hard X-ray emission; it was detected only at a 3 sigma level above 40 keV. We also analyzed public ISGRI data of Cyg X--2 to investigate the presence of a hard X-ray component. We report the possible presence of hard X-ray emission in one data set.

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