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

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