X-ray properties of an Unbiased Hard X-ray Detected Sample of AGN

Details X-ray properties of an Unbiased Hard X-ray Detected Sample of AGN X-ray properties of an Unbiased Hard X-ray Detected Sample of AGN

2007-10-31

arxiv.org/abs/0711.0019v1

Astronomy and Astrophysics

Astrophysics

39 pages, 16 figures, accepted to ApJ

Scientific paper

10.1086/525274

The SWIFT gamma ray observatory's Burst Alert Telescope (BAT) has detected a sample of active galactic nuclei (AGN) based solely on their hard X-ray flux (14-195 keV). In this paper, we present for the first time {\it XMM-Newton} X-ray spectra for 22 BAT AGNs with no previously analyzed X-ray spectra. If our sources are a representative sample of the BAT AGN, as we claim, our results present for the first time global X-ray properties of an unbiased towards absorption (n$_H < 3 \times 10^{25}$ cm$^{-2}$), local ($ = 0.03$), AGN sample. We find 9/22 low absorption (n$_H < 10^{23}$ cm$^{-2}$), simple power law model sources, where 4 of these sources have a statistically significant soft component. Among these sources, we find the presence of a warm absorber statistically significant for only one Seyfert 1 source, contrasting with the ASCA results of \citet{rey97} and \citet{geo98}, who find signatures of warm absorption in half or more of their Seyfert 1 samples at similar redshifts. Additionally, the remaining sources (14/22) have more complex spectra, well-fit by an absorbed power law at $E > 2.0$ keV. Five of the complex sources are classified as Compton-thick candidates. Further, we find four more sources with properties consistent with the hidden/buried AGN reported by Ueda {\it et al.} (2007). Finally, we include a comparison of the {\it XMM-Newton} EPIC spectra with available SWIFT X-ray Telescope (XRT) observations. From these comparisons, we find 6/16 sources with varying column densities, 6/16 sources with varying power law indices, and 13/16 sources with varying fluxes, over periods of hours to months. Flux and power law index are correlated for objects where both parameters vary.

Affiliated with

Also associated with

No associations

Rating

X-ray properties of an Unbiased Hard X-ray Detected Sample of AGN does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with X-ray properties of an Unbiased Hard X-ray Detected Sample of AGN, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray properties of an Unbiased Hard X-ray Detected Sample of AGN will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-334482