AGNs among ROSAT Blank Field Sources
Abstract
We selected a sample of sources with high X-ray over optical flux ratio from the ROSAT PSPC archives. Out of the 16 sources in our sample, one is a (possibly extreme) BL Lac and two are AGNs. Six more sources are tentatively classified as AGNs on the basis of their X-ray properties and of our optical-IR imaging. For one of the AGNs and for the AGN-like blanks we find a discrepancy between the lack of absorption indicated by the X-ray spectra and the presence of red counterparts in their error circles. We discuss various possibilities to reconcile the X-ray and optical information.
Cite
@article{arxiv.astro-ph/0212231,
title = {AGNs among ROSAT Blank Field Sources},
author = {I. Cagnoni and M. Elvis and D. -W. Kim and J. -S. Huang and A. Celotti and F. Nicastro},
journal= {arXiv preprint arXiv:astro-ph/0212231},
year = {2007}
}
Comments
4 pages, 1 table. Proceedings of the 5th Italian AGN Meeting "Inflows, Outflows and Reprocessing around black holes" (2002) on-line edition only available at http://www.merate.mi.astro.it/~gabriele/agn5/agn5.html