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The Evolution of Groups and Group Galaxies to Intermediate Redshifts

Published online by Cambridge University Press:  01 August 2006

Tesla E. Jeltema ,
John S. Mulchaey ,
Lori M. Lubin  and
Christopher D. Fassnacht
Tesla E. Jeltema
Affiliation:
The Observatories of the Carnegie Institution of Washington 813 Santa Barbara St., Pasadena, CA 91101 email: [email protected]
John S. Mulchaey
Affiliation:
The Observatories of the Carnegie Institution of Washington 813 Santa Barbara St., Pasadena, CA 91101 email: [email protected]
Lori M. Lubin
Affiliation:
Department of Physics, University of California at Davis, One Shields Ave., Davis, CA 95616
Christopher D. Fassnacht
Affiliation:
Department of Physics, University of California at Davis, One Shields Ave., Davis, CA 95616
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We have undertaken a multiwavelength project to study the properties of X-ray selected groups at intermediate redshifts (0.2 < z < 0.6). Mulchaey et al. (2006) presented the spectroscopic confirmation of nine groups. Jeltema et al. (2006) presented the X-ray properties of these groups based on observations taken with XMM-Newton. These observations confirm that these systems contain luminous, diffuse gas with luminosities and temperatures consistent with the correlations seen among groups and clusters at low redshift. We find indications of excess entropy in these systems over self-similar predictions out to large radii. We have obtained deeper spectroscopic follow-up of seven groups with the Keck and Gemini telescopes. Along with the HST imaging, we study the galaxy populations in these groups, and our main results are summarized below.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 208
Copyright
Copyright © International Astronomical Union 2007

References

Mulchaey, J.S., Lubin, L.M., Fassnacht, C., Rosati, P., & Jeltema, T.E. 2006, ApJ 646, 133.CrossRefGoogle Scholar
Jeltema, T.E., Mulchaey, J.S., Lubin, L.M., Rosati, P., & Böhringer, H. 2006, ApJ 649, 649.CrossRefGoogle Scholar