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The Astrophysical Journal Volume 681 Number 2 Create an alert RSS this journal

C. D. Fassnacht et al. 2008 ApJ 681 1017 doi:10.1086/588087

The X-Ray Properties of Moderate-Redshift Galaxy Groups Selected by Association with Gravitational Lenses

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C. D. Fassnacht1, D. D. Kocevski1, M. W. Auger1, L. M. Lubin1, J. L. Neureuther1, T. E. Jeltema2, J. S. Mulchaey3 and J. P. McKean4

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Abstract References Cited By
We present results from a systematic investigation of the X-ray properties of a sample of moderate-redshift (0.3 < z < 0.6) galaxy groups. These groups were selected not by traditional X-ray or optical search methods, but rather by an association, either physical or along the line of sight, with a strong gravitational lens. We calculate the properties of seven galaxy groups in the fields of six lens systems. Diffuse X-ray emission from the intragroup medium is detected in four of the groups. All of the detected groups have X-ray luminosities greater than 1042 h−2 ergs s−1 and lie on the LX-σv relations defined by local groups and clusters. The upper limits for the nondetections are also consistent with the local LX-σv relationships. Although the sample size is small and deeper optical and X-ray data are needed, these results suggest that lens-selected groups are similar to X-ray-selected samples and thus are more massive than the typical poor-group environments of local galaxies.

Subject headings

galaxies: clusters: general; gravitational lensing; X-rays: galaxies: clusters


Dates

Issue 2 (2008 July 10)

Received 2007 November 13, accepted for publication 2008 March 6



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