Groups of Galaxies in AEGIS: The 200 ksec Chandra Extended X-ray Source catalogue
Tesla E. Jeltema, Brian F. Gerke, Elise S. Laird, Christopher N. A., Willmer, Alison L. Coil, Michael C. Cooper, Marc Davis, Kirpal Nandra,, Jeffrey A. Newman

TL;DR
This paper reports the discovery of seven X-ray emitting galaxy groups in the AEGIS survey, including high-redshift systems, and analyzes their properties, AGN activity, and scaling relations compared to low-redshift counterparts.
Contribution
It presents the first X-ray detections of spectroscopically selected DEEP2 galaxy groups and explores their scaling relations and AGN activity across different redshifts.
Findings
Seven X-ray galaxy groups discovered, including high-redshift systems at z>0.7.
High-redshift groups follow low-redshift scaling relations.
All low-redshift groups are centered on massive elliptical galaxies.
Abstract
We present the discovery of seven X-ray emitting groups of galaxies selected as extended X-ray sources in the 200 ksec Chandra coverage of the All-wavelength Extended Groth Strip International Survey (AEGIS). In addition, we report on AGN activity associated to these systems. Using the DEEP2 Galaxy Redshift Survey coverage, we identify optical counterparts and determine velocity dispersions. In particular, we find three massive high-redshift groups at z>0.7, one of which is at z=1.13, the first X-ray detections of spectroscopically selected DEEP2 groups. We also present a first look at the the L_X-T, L_X-sigma, and sigma-T scaling relations for high-redshift massive groups. We find that the properties of these X-ray selected systems agree well with the scaling relations of similar systems at low redshift, although there are X-ray undetected groups in the DEEP2 catalogue with similar…
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