Computer Science
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008ycat..34870475p&link_type=abstract
VizieR On-line Data Catalog: J/A+A/487/475. Originally published in: 2008A&A...487..475P
Computer Science
Active Gal. Nuclei, X-Ray Sources, Redshifts
Scientific paper
We present the results from a detailed X-ray variability analysis of 66 AGN in the Lockman Hole, which have optical spectroscopic identifications.
We compare, quantitatively, their variability properties with the properties of local AGN, and we study the "variability - luminosity" relation as a function of redshift, and the "variability - redshift" relation in two luminosity bins.
We use archival data from the last 10 XMM-Newton observations of the Lockman Hole field to extract light curves in the rest frame, 2-10keV band. We use the "normalized excess variance" to quantify the variability amplitude. Using the latest results regarding the AGN power spectral shape and its dependence on black hole mass and accretion rate, we are able to compute model "variability - luminosity" curves, which we compare with the relations we observe. When we consider all the sources in our sample, we find that their variability amplitude decreases with increasing redshift and luminosity.
(1 data file).
Athanasiadis Dimitris
Chatzopoulos Emmanouil
Georgantopoulos Ioannis
Markowitz Alex
Papadakis Iossif E.
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