Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-03-30
Astrophys.J.698:1207-1220,2009
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
17 pages, 15 Postscript figures, 3 tables, accepted for publication in ApJ
Scientific paper
10.1088/0004-637X/698/2/1207
We investigate the X-ray variability characteristics of hard X-ray selected AGNs (based on Swift/BAT data) in the soft X-ray band using the RXTE/ASM data. The uncertainties involved in the individual dwell measurements of ASM are critically examined and a method is developed to combine a large number of dwells with appropriate error propagation to derive long duration flux measurements (greater than 10 days). We also provide a general prescription to estimate the errors in variability derived from rms values from unequally spaced data. Though the derived variability for individual sources are not of very high significance, we find that, in general, the soft X-ray variability is higher than those in hard X-rays and the variability strengths decrease with energy for the diverse classes of AGN. We also examine the strength of variability as a function of the break time scale in the power density spectrum (derived from the estimated mass and bolometric luminosity of the sources) and find that the data are consistent with the idea of higher variability at time scales longer than the break time scale.
Agrawal Vivek K.
Bose Debanjan
Chitnis Varsha R.
Misra Rajiv
Pendharkar Jayant K.
No associations
LandOfFree
X-ray variability of AGNs in the soft and the hard X-ray bands 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 X-ray variability of AGNs in the soft and the hard X-ray bands, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray variability of AGNs in the soft and the hard X-ray bands will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-424999