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C. R. Watson, C. S. Kochanek (The Ohio State University), K. Brand, M. J. I. Brown, A. Dey, B. Jannuzi, J. Najita (NOAO), P. Green, D. Fabricant, G. Fazio, W. Forman, C. Jones, A. Kenter, S. Murray, A. Vikhlinin (CfA), B. McNamara, J. Shields (Ohio University), M. Rieke (University of Arizona)
We have used CXO ACIS-I observations of the Bootes field to determine the X-ray emission from a stacked sample of 140 2MASS galaxies with redshifts ranging from z ~0 to z ~0.1. Both the averaged radial profile and spectrum of these objects will be presented. The radial profile falls off steeply out to ~10 arcseconds, but it is unlikely that AGN are the source of the observed X-rays because the mean X-ray luminosity is orders of magnitude below what one would expect for AGN. It is therefore assumed that X-ray binaries are the principle sources of the X-rays, and that consequently these observations provide a link to star formation history at low redshift. Tight correlations between X-ray emissions of similar nearby galaxies (ie. Colbert et. al. 2004) and their IR, optical, and UV luminosities further strengthen this assumption.
Our research is supported by the National Optical Astronomy Observatory which is operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under a cooperative agreement with the National Science Foundation. Support for this work was provided by the National Aeronautics and Space Administration through Chandra Award Number GO3-4176 issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics and Space Administration under contract NAS8-39073. CW also acknowledges support by the US D.O.E. Contract No. DE-FG02-91ER40690.
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Bulletin of the American Astronomical Society, 36 #2
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