Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915438a&link_type=abstract
American Astronomical Society, AAS Meeting #219, #154.38
Astronomy and Astrophysics
Astronomy
Scientific paper
Active galactic nuclei (AGN) are supermassive black holes accreting matter at the centers of galaxies. A new way to select AGN is through their very hard X-ray emission. We present the X-ray spectral analysis of newly detected sources from the Swift Gamma-ray burst satellite. We present the Swift XRT and BAT spectra of the uncategorized sources in the BAT 58-month catalog. An X-ray color-color diagram is shown, using the 0.5-2 keV, 2-10 keV, and 14-195 keV bands, to compare these sources with the brightest BAT sources from the Swift 9-month catalog. The newly detected AGN are not heavily obscured, with average column densities of 2.5x1021 cm-2. Their average luminosities are 3.5x1045 ergs s-1, which is above that of the previously detected AGN, and they are also more distant.
Ashburn Allison
Winter Lars
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