Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.3801m&link_type=abstract
American Astronomical Society Meeting 207, #38.01; Bulletin of the American Astronomical Society, Vol. 37, p.1222
Other
Scientific paper
We present results from the the Swift Burst Alert Telescope (BAT) high galactic latitude survey in the 14--200 keV band. The survey reaches a flux of ˜ 10-11 erg cm-2 s-1 and has ˜ 2.7' (90% confidence) positional uncertainties for the faintest sources. This represents the most sensitive survey to date (by a factor of ˜ 10) in this energy band.
Based on the first 3 months of observations, we have identified 86% of the 66 high-latitude sources. 12 are galactic type sources and 44 can be identified with previously known AGN. All but 5 of the AGN have archival X-ray spectra, enabling the estimation of line of sight column densities and other spectral properties. The median redshift (excluding radio-loud objects) is 0.012. We find that the column density distribution of these AGN is bimodal with 64% of the non-blazar sources having column densities NH ≥ 1022 cm-2. None of the sources with log LX>43.5 show high column densities and very few of the lower LX sources have low column densities. We will present results based on improved analysis and larger exposure times.
Barbier Louis
Barthelmy Scott
Burrows David
Cummings Jay
Falcone Abraham
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