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Title:
Swift BAT Survey of AGNs
Authors:
Tueller, J.; Mushotzky, R. F.; Barthelmy, S.; Cannizzo, J. K.; Gehrels, N.; Markwardt, C. B.; Skinner, G. K.; Winter, L. M.
Affiliation:
AA(NASA Goddard Space Flight Center, Astrophysics Science Division, Greenbelt, MD 20771.), AB(NASA Goddard Space Flight Center, Astrophysics Science Division, Greenbelt, MD 20771.), AC(NASA Goddard Space Flight Center, Astrophysics Science Division, Greenbelt, MD 20771.), AD(NASA Goddard Space Flight Center, Astrophysics Science Division, Greenbelt, MD 20771.; CRESST/Joint Center for Astrophysics, University of Maryland, Baltimore County, Baltimore, MD 21250.), AE(NASA Goddard Space Flight Center, Astrophysics Science Division, Greenbelt, MD 20771.), AF(NASA Goddard Space Flight Center, Astrophysics Science Division, Greenbelt, MD 20771.; CRESST/Department of Astronomy, University of Maryland, College Park, MD 20742.), AG(NASA Goddard Space Flight Center, Astrophysics Science Division, Greenbelt, MD 20771.; CRESST/Department of Astronomy, University of Maryland, College Park, MD 20742.), AH(NASA Goddard Space Flight Center, Astrophysics Science Division, Greenbelt, MD 20771.; CRESST/Department of Astronomy, University of Maryland, College Park, MD 20742.)
Publication:
The Astrophysical Journal, Volume 681, Issue 1, pp. 113-127. (ApJ Homepage)
Publication Date:
07/2008
Origin:
UCP
ApJ Keywords:
Galaxies: Active, Gamma Rays: Observations, Surveys
DOI:
10.1086/588458
Bibliographic Code:
2008ApJ...681..113T

Abstract

We present the results of the analysis of the first 9 months of data of the Swift BAT survey of AGNs in the 14-195 keV band. Using archival X-ray data or follow-up Swift XRT observations, we have identified 129 (103 AGNs) of 130 objects detected at |b|>15deg and with significance >4.8 σ. One source remains unidentified. These same X-ray data have allowed measurement of the X-ray properties of the objects. We fit a power law to the logN-logS distribution, and find the slope to be 1.42+/-0.14. Characterizing the differential luminosity function data as a broken power law, we find a break luminosity logL*(erg s-1) = 43.85 +/- 0.26, a low-luminosity power law slope a=0.84+0.16-0.22, and a high-luminosity power law slope b=2.55+0.43-0.30, similar to the values that have been reported based on INTEGRAL data. We obtain a mean photon index 1.98 in the 14-195 keV band, with an rms spread of 0.27. Integration of our luminosity function gives a local volume density of AGNs above 1041 erg s-1 of 2.4×10-3 Mpc-3, which is about 10% of the total luminous local galaxy density above M*=-19.75. We have obtained X-ray spectra from the literature and from Swift XRT follow-up observations. These show that the distribution of lognH is essentially flat from nH=1020 to 1024 cm-2, with 50% of the objects having column densities of less than 1022 cm-2. BAT Seyfert galaxies have a median redshift of 0.03, a maximum log luminosity of 45.1, and approximately half have lognH>22.
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