Chandra Snapshot Survey of Nearby Galaxies

Details Chandra Snapshot Survey of Nearby Galaxies Chandra Snapshot Survey of Nearby Galaxies

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.1516p&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #15.16; Bulletin of the American Astronomical Society, Vol. 32, p.1205

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on the results of a volume-limited Chandra ACIS-S snapshot survey of nearby galaxies. The typical exposure time was several ks. The sample consists of low-luminosity Seyferts, LINERs, and LINER/H II transition nuclei. Of the 24 galaxies observed to date, ~ 75% have been detected in the 0.5-8.0 keV bandpass. The detection rate is roughly independent of the optical spectral class. In many cases USNO sources were also detected, allowing the astrometry to be corrected to better than 1{' '} accuracy. In addition to the nuclear sources, we invariably find a number of compact sources, presumably X-ray binaries, distributed away from the nucleus. The sensitivity of the survey is ~ LX ~ 1037-38 \ ergs \ s-1, unless the column density is on the order of 1023 \ cm-2 in which case the limiting luminosity is ~ 1039 \ ergs \ s-1, or comparable to the least-luminous AGNs known. Most or all of our sample should have been observed by November 2000. The X-ray luminosity is correlated with Hα luminosity, although with significant scatter. This correlation extends the trend previously established for more powerful sources (based on ASCA data) down by a factor of ~ 100 in luminosity, and it is relatively free of selection biases given the completeness of our data. This work is supported by NASA contract NAS8-38252.

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