EDP Sciences
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Volume 400, Number 2, March III 2003
Page(s) 553 - 558
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20030020

A&A 400, 553-558 (2003)
DOI: 10.1051/0004-6361:20030020

Spectral modeling of the three spectral states of the Galactic microquasar GRS 1915+105

M. A. Sobolewska and P. T. Zycki

Nicolaus Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland
    e-mail: malsob@camk.edu.pl
(Received 3 June 2002 / Accepted 7 January 2003)

We have analyzed Rossi X-ray Timing Explorer spectral data of the Galactic micro-quasar GRS 1915+105 in its various spectral states, as defined by Belloni et al. (2000). In states A and B the spectra are dominated by a strong soft thermal component, accompanied by a weak harder tail. The soft component is rather complex and cannot be described as a simple accretion disk emission. Relativistic effects in Kerr metric contribute to the complexity of the soft component but are not sufficient to fully account for it. As found previously, state C spectra are dominated by a Comptonized component, with small contribution from disk photons. The X-ray reprocessed component is highly significant in those spectra and, in contrast to the usual hard state spectra from accreting black holes, it is highly ionized.

Key words: accretion, accretion disks -- stars: individual: GRS 1915+105 -- X-rays: binaries

Offprint request: P. T. Zycki, ptz@camk.edu.pl

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