On the Exotic Hard X-ray Source Populations in the Hellas2XMM survey
arXiv:astro-ph/0504278
Abstract
Recent hard X-ray surveys have proven to be effective in discovering large numbers of X-ray sources that, despite the likely association with active nuclei, appear to be characterized by "peculiar" properties. Among these "exotic" source populations, we will focus on the nature of two classes of hard X-ray sources: those characterized by high X-ray-to-optical flux ratios -- a fraction of these are associated with the rather elusive Type 2 quasars -- and the X-ray bright optically normal galaxies, also known as XBONGs.
arXiv commentOn behalf of the HELLAS2XMM Collaboration, 6 pages, 4 figures, contribution to the Proceedings of the COSPAR Scientific Assembly, E1.3 "High-Energy Radiation from Black Holes: from Supermassive Black Holes to Galactic Solar Mass Black Holes", Paris (France), July 18-25, 2004, accepted for publication in Advances in Space Research
References in corpus (12)
- The Chandra Deep Field South: Optical Spectroscopy I
- Candidate Type II Quasars from the Sloan Digital Sky Survey: I. Selection and Optical Properties of a Sample at 0.3<Z<0.83
- Optical and Infrared Properties of the 2 Ms Chandra Deep Field-North X-ray Sources
- A Classic Type 2 QSO
- "Hidden" Seyfert 2 Galaxies and the X-ray Background
- The HELLAS2XMM survey: II. Multiwavelength observations of P3: an X-ray bright, optically inactive galaxy
- Chandra Detection of a TypeII Quasar at z=3.288
- The Nature of X-ray Bright Optically Normal Galaxies
- The HELLAS2XMM survey: I. The X-ray data and the Log(N)-Log(S)
- XMM-Newton observations expose AGN in apparently normal galaxies
- Evidence for X-ray Obscuration in Type II Quasar Candidates from the Sloan Digital Sky Survey
- Unconventional AGN in hard X-ray surveys