Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21712501b&link_type=abstract
American Astronomical Society, AAS Meeting #217, #125.01; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a composite analysis of the hard X-ray (15 -- 195 keV) spectra of over 500 AGN from the Swift-BAT all sky survey. The AGN observed in over 65 months of the survey are a mixture of Seyfert galaxies (Type I 56%, Type II 43%) with a median redshift of z=0.04, and QSOs and blazars at higher redshifts.
It has been shown in high resolution X-ray (1-10 keV) studies of the cosmic X-ray background that the CXB is composed of the combined output of AGN out to high redshifts. The spectrum of the CXB is well measured and peaks in the hard X-ray band. However, the hard X-ray spectra of individual AGN have not been measured at the same level of detail until now.
We present the hard X-ray spectra of individual Type I, Type II, and Compton-thick AGN from the Swift-BAT survey as well as an analysis of the stacked spectra of these groups in order to investigate whether the spectral properties (spectral index, cutoff) vary as a class or as a function of luminosity. We then attempt to address the question of how well the hard X-ray spectrum of the CXB can be explained as a composite of the spectra of AGN in the local universe as measured by Swift-BAT.
Baumgartner Wayne H.
Mushotzky Richard
Tueller Jack
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