The X-ray properties of Type II Quasars from the Sloan Digital Sky Survey

Details The X-ray properties of Type II Quasars from the Sloan Digital Sky Survey The X-ray properties of Type II Quasars from the Sloan Digital Sky Survey

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.122j&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

Physics

Agn Evolution

Scientific paper

65 Type II quasars were found to be covered by Chandra (35) and XMM-Newton (32) archival observations by correlating with the largest catalog of Type II quasars to date selected from Sloan Digital Sky Survey (SDSS). We studied the X-ray properties of these Type II quasars systematically and statistically, and spectra were fitted to characterize the spectral properties of each source. We find that the mean of the column density and photon index of our sample are NH = 1.78E23 cm^{-2} and γ = 1.79. Our sample are selected from their bright [OIII]5007 optical emission lines, which are formed in the Narrow Line Region (NLR) far away from the central engine. Unlike the X-ray emission, the [OIII] line is typically only moderately affected by the obscuration, and could be used as an indicator of the intrinsic AGN luminosity. The ratio of hard X-ray to [OIII] luminosity shows that the majority of our sample are significantly obscured, and approximately half of the sources are underestimated in the absorbing column density by the power-law continuum model spectral fitting. We thus run a simulation of a more physically realistic model which accounts for the partial covering and Compton scattering to predict the true columns, and the result is consistent with the data. In addition to the ``traditional'' spectral analysis, we also performed the Markov Chain Monte Carlo (MCMC) simulations to check the consistency of our spectral fits.

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