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Date and Time of the Query: 2019-06-25 T15:02:56 PDT
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For refcode 2005ApJ...633L..77M:
Retrieve 44 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2005ApJ...633L..77M The Swift/BAT High-Latitude Survey: First Results C. B. Markwardt, J. Tueller, G. K. Skinner, N. Gehrels, S. D. Barthelmy, and R. F. Mushotzky Abstract. We present preliminary results from the first 3 months of the Swift Burst Alert Telescope (BAT) high Galactic latitude survey in the 14 -- 195 keV band. The survey reaches a flux of ~10^-11^ ergs cm^-2^ s^-1^ and has ~2.7' (90% confidence) positional uncertainties for the faintest sources. This represents the most sensitive survey to date in this energy band. These data confirm the conjectures that a high-energy -- selected active galactic nucleus (AGN) sample would have very different properties from those selected in other bands and that it represents a "true" sample of the AGN population. We have identified 86% of the 66 high-latitude sources. Twelve are Galactic-type sources, and 44 can be identified with previously known AGNs. All but five of the AGNs have archival X-ray spectra, enabling us to estimate the line-of-sight column densities and other spectral properties. Both of the z>0.11 objects are blazars. The median redshift of the others (excluding radio-loud objects) is 0.012. We find that the column density distribution of these AGNs is bimodal, with 64% of the nonblazar sources having column densities N_H_ >= 10^22^ cm^-2^. None of the sources with log L_X_>43.5 (cgs units) show high column densities, and very few of the lower L_X_ sources have low column densities. Based on these data, we expect the final BAT catalog to have >200 AGNs and reach fluxes of less than ~10^-11^ ergs cm^-2^ s^-1^ over the entire sky. Key words: Galaxies: Active, Gamma Rays: Observations, Surveys
Retrieve 44 NED objects in this reference.
Please click here for ADS abstract

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