NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-19 T12:53:37 PDT
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For refcode 2008ApJ...681..113T:
Retrieve 154 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2008ApJ...681..113T Swift BAT Survey of AGNs Tueller, J.; Mushotzky, R. F.; Barthelmy, S.; Cannizzo, J. K.; Gehrels, N.; Markwardt, C. B.; Skinner, G. K.; Winter, L. M. 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|>15^deg^ and with significance >4.8 {sigma}. 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 10^41^ erg s^-1^ of 2.4x10^-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 logn_H_ is essentially flat from n_H_=10^20^ to 10^24^ cm^-2^, with 50% of the objects having column densities of less than 10^22^ cm^-2^. BAT Seyfert galaxies have a median redshift of 0.03, a maximum log luminosity of 45.1, and approximately half have logn_H_>22. Key words: Galaxies: Active, Gamma Rays: Observations, Surveys
Retrieve 154 NED objects in this reference.
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