8th HEAD Meeting, 8-11 September, 2004
Session 2 Galaxy Clusters and the Intergalactic Medium
Poster, Wednesday, September 8, 2004, 9:00am-10:00pm

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[2.14] CL 1205+44: A fossil missing link?

M. P. Ulmer (Northwestern University), C. Adami, G. Covone (LAM, Marseille, France), F. Durret (IAP, Paris, France), G. B. Lima Neto (IAG, Sao Paulo, Brazil)

This is a report of Chandra, XMM-Newton, HST, and ARC observations of an extended X-ray source at z = 0.33. The apparent member galaxies range from spiral to elliptical and are relatively red (i'-Ks about 3). We interpret this object to be a young fossil group which has somehow managed to suppress the star formation rate of the resident galaxies.This complex system sheds new light on the origin and evolution of galaxies in fossil groups and the relationship of fossil groups to poor clusters. The system also contains a central dominant double lobed radio galaxy which appears to be growing via the accretion of smaller galaxies. This work was supported in part by NASA guest observer grants for the Chandra and XMM observations.

The author(s) of this abstract have provided an email address for comments about the abstract: m-ulmer2@northwestern.edu

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Bulletin of the American Astronomical Society, 36 #3
© 2004. The American Astronomical Soceity.