AAS 207th Meeting, 8-12 January 2006
Session 177 Galaxy Clusters across the Spectrum
Poster, Thursday, 9:20am-4:00pm, January 12, 2006, Exhibit Hall

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[177.11] Chandra X-ray Observations of Galaxies in an Off-Center Region of the Coma Cluster

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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