The hard X-ray spectrum of GRS1915+105

Details The hard X-ray spectrum of GRS1915+105 The hard X-ray spectrum of GRS1915+105

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410..897h&link_type=abstract

The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 897-901 (1997).

Computer Science

2

X-Ray Sources, X-Ray Bursts, Black Holes, X-Ray, Luminosities, Magnitudes, Effective Temperatures, Colors, And Spectral Classification

Scientific paper

We have fit 2-250 keV spectra of the Galactic microquasar GRS 1915+105 obtained with the Rossi X-ray Timing Explorer (RXTE). Two individual observations, from 1996 August and 1997 January, as well as 15-250 keV data averaged over multiple observations made during 1997 January through March are analyzed. We find that when GRS 1915+105 was bright (L2-10 keV~1039 ergs s-1) and variable on day-long timescales, its spectrum was consistent with the standard black hole X-ray high (soft) state. When the source was dimmer (L2-10 keV~1038 ergs s-1) and steady, its spectrum was well described by the black hole X-ray low (hard) state. We confirm that these X-ray states are associated with the gamma-ray ``power-law'' and ``breaking'' states identified by Grove et al. [3].

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