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

Details Chandra X-ray Observations of Galaxies in an Off-Center Region of the Coma Cluster Chandra X-ray Observations of Galaxies in an Off-Center Region of the Coma Cluster

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717711h&link_type=abstract

American Astronomical Society Meeting 207, #177.11; Bulletin of the American Astronomical Society, Vol. 37, p.1451

Astronomy and Astrophysics

Astronomy

Scientific paper

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}/{f{R}}<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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