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

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

2003-01-21

arxiv.org/abs/astro-ph/0301408v1

Astron.Astrophys. 400 (2003) 553

Astronomy and Astrophysics

Astrophysics

A&A, in press

Scientific paper

10.1051/0004-6361:20030020

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.

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