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26 April 2024 |
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Broad-band X-Ray Spectra of the Black Hole Candidate GRO J1655-40 | | John A. Tomsick
; Philip Kaaret
; Richard A. Kroeger
; Ronald A. Remillard
; | | Date: |
8 Sep 1998 | | Subject: | astro-ph | | Affiliation: | Columbia University), Philip Kaaret (Harvard-Smithsonian Center for Astrophysics), Richard A. Kroeger (Naval Research Laboratory), Ronald A. Remillard (Center for Space Research, MIT | | Abstract: | We present broad-band (2 keV to 2 MeV) X-ray spectra of GRO J1655-40, a luminous X-ray transient and occasional source of relativistic radio jets, obtained with RXTE and OSSE. In one observation, the luminosity is found to be 18% of the Eddington limit, which is one of the highest luminosities ever observed from GRO J1655-40. For this observation, we find that an adequate fit is obtained when a broad iron line and a reflection component are added to a model consisting of a power-law plus a soft excess component. The 95% confidence lower limit on the rms line width is 0.86 keV. The power-law component has a photon index of 2.72 and extends to at least 800 keV without a cutoff. After this observation, a significant drop in the (5-12 keV)/(1.5-5 keV) hardness ratio occurred on a timescale less than 2 hours. From an RXTE observation of GRO J1655-40 made after the hardness transition, we find that the power-law index is harder (2.415 +/- 0.011), the flux of the power-law component is lower, and the total luminosity is 10% of the Eddington limit. The change in the power-law component is consistent with the correlation between the spectral index and power-law flux previously reported for GRO J1655-40. | | Source: | arXiv, astro-ph/9809098 | | Services: | Forum | Review | PDF | Favorites | |
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