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A. E. Hornschemeier (NASA GSFC), B. Mobasher (STScI), D.M. Alexander (IoA Cambridge), F.E. Bauer (Columbia University), M.W. Bautz (KIASR, MIT), D. Hammer (JHU), B.M. Poggianti (Padova)
We have performed a pilot Chandra survey of a region in the outskirts of the Coma cluster to explore the X-ray properties and Luminosity Function of normal galaxies. We present results on 13 Chandra-detected galaxies with optical photometric matches, including four spectroscopically-confirmed Coma-member galaxies. We have taken the well-measured optical luminosity function in this region of the Coma cluster and translated it to an X-ray luminosity function, finding that the galaxies in the outskirts of Coma have low X-ray-to-optical flux ratios ({fX\over{fR}}<10-3). This value is lower than both the Milky Way and the majority of field galaxies in the nearby Universe. This confirms the Finoguenov et al. (2003) result that the X-ray emission per unit optical flux per galaxy is suppressed in clusters of galaxies, but extends this work to a specific off-center environment in the Coma cluster. Finally, we report the discovery of a region of diffuse X-ray flux which might correspond to a small group interacting with the Coma Intra-Cluster Medium (ICM).
We gratefully acknowledge the financial support of Chandra X-ray Center grant G05-5089X,
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.