Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.140l&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Other
Agn Evolution
Scientific paper
A majority of Active Galactic Nuclei (AGN) are significantly obscured. Compton-thick AGN (where the column density of the obscuring material exceeds 10^{24} cm^{-2}) are under-represented in X-ray surveys as the 2-10 keV emission is severely attenuated. However, optical and infrared emission lines, such as the [OIII]λ5007 and [OIV]25.89μm lines, are not affected by this obscuration as they form hundreds of parsecs from the torus in the Narrow Line region, though the [OIII] line suffers some extinction due to the host galaxy (by about a factor of 2) whereas the extinction for the [OIV] line is negligible. Comparison of the X-ray luminosity, which suffers from attenuation, with the [OIII] and [OIV] luminosity can then indicate the amount of obscuration present and whether a source is Compton-thick or Compton-thin.Here we present the results of a sample of 17 Seyfert 2 galaxies selected based on their high [OIII] flux. X-ray follow-up observations with XMM-Newton were undertaken to assess the amount of obscuration present. We find that 11 out of 17 have observed 2-10 keV emission depressed by an order-of-magnitude or more in comparison to isotropic indicators of AGN luminosity. Along with the Fe Kα equivalent width measurements, these results indicate that these targets are likely Compton-thick. We find no correlation between the amount of X-ray obscuration and other properties of the AGN or its host galaxy, indicating that Compton-thick AGN may not trace a distinct population from Compton-thin sources. We are currently supplementing this sample with the original 12 μm sample of Seyfert 2 galaxies, using XMM-Newton and Chandra observations to perform a similar analysis as the [OIII]-selected sample.
Heckman Timothy
Hornschemeier Ann
LaMassa Stephanie
Martins Lucimara
Ptak Andrew
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