Broad-band X-Ray Spectra of the Black Hole Candidate GRO J1655-40

Details Broad-band X-Ray Spectra of the Black Hole Candidate GRO J1655-40 Broad-band X-Ray Spectra of the Black Hole Candidate GRO J1655-40

1998-09-08

arxiv.org/abs/astro-ph/9809098v1

Astronomy and Astrophysics

Astrophysics

20 pages, 5 figures, Accepted for publication in the Astrophysical Journal

Scientific paper

10.1086/306797

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.

Affiliated with

Also associated with

No associations

Rating

Broad-band X-Ray Spectra of the Black Hole Candidate GRO J1655-40 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Broad-band X-Ray Spectra of the Black Hole Candidate GRO J1655-40, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Broad-band X-Ray Spectra of the Black Hole Candidate GRO J1655-40 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-329382