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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[177.09] Spitzer Observations of an Off-Center Region of the Coma Cluster

L. P. Jenkins (Johns Hopkins University), A. E. Hornschemeier (NASA GSFC), B. Mobasher (STScI), D. M. Alexander (IoA Cambridge), F. E. Bauer (Columbia University)

We present the first results of Spitzer IRAC (Infrared Array Camera) observations of an off-center region in Coma, the nearest rich galaxy cluster (z=0.023). Studies of nearby clusters are vital as they provide unique laboratories for the study of the formation and evolution of galaxies across a variety of environments, ranging from the dense cores to the less dense outskirts. The IRAC observations presented here are for a 30'x50' field located approximately 40 arcminutes north-west from the center of Coma. With this unique dataset we have constructed a preliminary mid-IR (3-8 micron) luminosity function (LF) of the spectroscopically confirmed Coma member galaxies in this field. We also study the transformation between the mid-IR LF and the optical (R-band) LF.

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Bulletin of the American Astronomical Society, 37 #4
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