The AGN Source Population in the Chandra Deep Field-North Survey: Constraints from X-ray Spectroscopy and Variability
Abstract
We briefly report here on our ongoing X-ray spectroscopy and variability analyses of 136 faint X-ray sources discovered in the 2 Ms Chandra Deep Field North observations spanning 1.4x10-15 to 2x10-13 ergs s-1 cm-2. Most sources are adequatley fitted with a simple intrinsic absorption plus power-law model, although the resulting photon index is much lower than the canonical average unabsorbed spectral slope found locally (suggesting additional spectral complexity). Among the 136 sources, 7% show significant Fe (Ka) emission features, with equivalent widths in the range 0.1-1.3 keV. Two of these emission-line sources appear to be Compton thick. For the subset of sources with redshifts, we also find that fewer than 10% are likely to be Compton thick. Finally, ~60% of the sample show signs of long-term variability. This fraction climbs to ~90% for the bright sources (>500 cnts) or BLAGN.
Cite
@article{arxiv.astro-ph/0210310,
title = {The AGN Source Population in the Chandra Deep Field-North Survey: Constraints from X-ray Spectroscopy and Variability},
author = {F. E. Bauer and C. Vignali and D. M. Alexander and W. N. Brandt and G. P. Garmire and A. E. Hornschemeier and P. Broos and L. Townsley and D. P. Schneider},
journal= {arXiv preprint arXiv:astro-ph/0210310},
year = {2015}
}
Comments
Proceedings for the "X-ray Surveys: in the light of new observatories" workshop (submitted to Astron. Nachrichten; includes anabs.cls style file). One page and two figures