Astrophys. J., 681, 113-127 (2008/July-1)
Swift BAT survey of AGNs.
TUELLER J., MUSHOTZKY R.F., BARTHELMY S., CANNIZZO J.K., GEHRELS N., MARKWARDT C.B., SKINNER G.K. and WINTER L.M.
Abstract (from CDS):
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° 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) = 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 of 2.4x10–3/Mpc3, 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/cm2, with 50% of the objects having column densities of less than 1022/cm2. BAT Seyfert galaxies have a median redshift of 0.03, a maximum log luminosity of 45.1, and approximately half have lognH>22.
Galaxies: Active - Gamma Rays: Observations - Surveys
VizieR on-line data:
<Available at CDS (J/ApJ/681/113): table1.dat refs.dat>
Table 1, col(1): numbering NNN not used in SIMBAD.
View the reference in ADS
To bookmark this query, right click on this link: simbad:2008ApJ...681..113T and select 'bookmark this link' or equivalent in the popup menu