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X-ray Properties of Intermediate-Redshift Groups of Galaxies | | T.E. Jeltema
; J.S. Mulchaey
; L.M. Lubin
; P. Rosati
; H. Bohringer
; | | Date: |
2 Jun 2006 | | Abstract: | We have undertaken a multiwavelength project to study the relatively unknown properties of groups and poor clusters of galaxies at intermediate redshifts. In this paper, we describe the XMM-Newton observations of six X-ray selected groups with 0.2<z<0.6. The X-ray properties of these systems are generally in good agreement with the properties of low-redshift groups. They appear to follow the scaling relations between luminosity, temperature, and velocity dispersion defined by low-redshift groups and clusters. The X-ray emission in four of the six groups is also centered on a dominant early-type galaxy. The lack of a bright elliptical galaxy at the peak of the group X-ray emission is rare at low-redshifts, and the other two groups may be less dynamically evolved. We find indications of excess entropy in these systems over self-similar predictions out to large radii. We also confirm the presence of at least one X-ray luminous AGN associated with a group member galaxy and find several other potential group AGN. | | Source: | arXiv, astro-ph/0606064 | | Services: | Forum | Review | PDF | Favorites | |
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