RXTE spectra of the Galactic microquasar GRO J1655-40 during the 2005 outburst

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We report on the results of a detailed spectral analysis of 389 RXTE observations of the Galactic microquasar GRO J1655-40, performed during its 2005 outburst. The maximum luminosity reached during this outburst was 1.4 times higher than in the previous (1996-1997) outburst. However, the spectral behavior during the two outbursts was very similar. In particular, Ldisk was proportional to Tin^4 up to the same critical luminosity and in both outbursts there were periods during which the energy spectra were very soft, but could not be fit with standard disk models.

6 pages, 5 figures, Accepted for publication in the proceedings of "Sixth Microquasar Workshop: Microquasars and Beyond", held in 18-22 September 2006 in Como, Italy, eds T. Belloni et al

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