Ensemble X-ray variability of active galactic nuclei at intermediate and long time lags
Abstract
We present a variability analysis for a sample of 2700 active galactic nuclei extracted from the latest release of the XMM-Newton serendipitous source catalogue. The structure function of this sample increases up to rest-frame time lags of about 5 years. Moreover, comparing observations performed by the XMM-Newton and ROSAT satellites, we are able to extend the X-ray structure function to 20 years rest-frame, showing a further increase of variability without any evidence of a plateau. Our results are compared with similar analyses in the optical band, and discussed in relation to the physical sizes of the emitting regions.
- Publication:
-
Active Galactic Nuclei: What's in a Name?
- Pub Date:
- August 2016
- DOI:
- 10.5281/zenodo.60405
- Bibcode:
- 2016agnw.confE..30V
- Keywords:
-
- Active Galactic Nuclei;
- Zenodo community agn2016