An exploratory study of the hard X-ray variability properties of PG quasars with RXTE

Details An exploratory study of the hard X-ray variability properties of PG quasars with RXTE An exploratory study of the hard X-ray variability properties of PG quasars with RXTE

2000-05-08

arxiv.org/abs/astro-ph/0005131v1

New Astron.Rev. 44 (2000) 415-417

Astronomy and Astrophysics

Astrophysics

Contributed talk presented at the Joint MPE,AIP,ESO workshop on NLS1s, Bad Honnef, Dec. 1999, to appear in New Astronomy Revie

Scientific paper

10.1016/S1387-6473(00)00070-1

We have monitored with the RXTE PCA the variability pattern of the 2-20 keV flux in four PG quasars (QSOs) from the Laor et al. (1994) sample. Six observations of each target at regular intervals of 1 day were performed. The sample comprises objects with extreme values of Balmer line width (and hence soft X-ray steepness) and spans about one order of magnitude in luminosity. The most robust result is that the variability amplitude decreases as energy increases. Several options for a possible ultimate driver of the soft and hard X-ray variability, such as the influx rate of Comptonizing relativistic particles, instabilities in the accretion flow or the number of X-ray active sites, are consistent with our results.

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