Hard X-ray variability of the black-hole candidate GRO J0422+32 during its 1992 outburst

Details Hard X-ray variability of the black-hole candidate GRO J0422+32 during its 1992 outburst Hard X-ray variability of the black-hole candidate GRO J0422+32 during its 1992 outburst

1998-10-30

arxiv.org/abs/astro-ph/9810492v1

Astronomy and Astrophysics

Astrophysics

33 pages, including 14 postscript figures, AASTEX. To appear in ApJ 1999, March 1, vol. 513 #1

Scientific paper

10.1086/306845

We have studied the hard X-ray variability of the soft X-ray transient GRO J0422+32 with BATSE in the 20-100 keV energy band. Our analysis covers 180 days following the first X-ray detection of the source on 1992 August 5, fully covering its primary and secondary X-ray outburst. We computed power density spectra (PDSs) in the 20-50, 50-100, and 20-100 keV energy bands, in the frequency interval 0.002-0.488 Hz. The PDSs of GRO J0422+32 are approximately flat up to a break frequency, and decay as a power law above, with index ~1. The canonical anticorrelation between the break frequency and the power density at the break, observed in Cyg X-1 and other BHCs in the low state, is not observed in the PDSs of GRO J0422+32. We compare our results with those of similar variability studies of Cyg X-1. The relation between the spectral slope and the amplitude of the X-ray variations of GRO J0422+32 is similar to that of Cyg X-1; however, the relation between the hard X-ray flux and the amplitude of its variation is opposite to what has been found in Cyg X-1. Phase lags between the X-ray flux variations of GRO J0422+32 at high and low photon energies, could only be derived during the first 30 days of its outburst. During this period, the variations in the 50-100 keV lag those in the 20-50 keV energy band by an approximately constant phase difference of 0.039(3) rad in the frequency interval 0.02-0.20 Hz.

Affiliated with

Also associated with

No associations

Rating

Hard X-ray variability of the black-hole candidate GRO J0422+32 during its 1992 outburst 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 Hard X-ray variability of the black-hole candidate GRO J0422+32 during its 1992 outburst, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hard X-ray variability of the black-hole candidate GRO J0422+32 during its 1992 outburst will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-82380