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We present the results of a search for extended X-ray sources and theircorresponding galaxy groups from 800-ks Chandra coverage of the All-wavelengthExtended Groth Strip International Survey (AEGIS). This yields one of thelargest X-ray selected galaxy group catalogs from a blind survey to date. Thered-sequence technique and spectroscopic redshifts allow us to identify 100$%$of reliable sources, leading to a catalog of 52 galaxy groups. The groups spanthe redshift range $z\sim0.066-1.544$ and virial mass range$M_{200}\sim1.34\times 10^{13}-1.33\times 10^{14}M_\odot$. For the 49 extendedsources which lie within DEEP2 and DEEP3 Galaxy Redshift Survey coverage, weidentify spectroscopic counterparts and determine velocity dispersions. Weselect member galaxies by applying different cuts along the line of sight or inprojected spatial coordinates. A constant cut along the line of sight can causea large scatter in scaling relations in low-mass or high-mass systems dependingon the size of cut. A velocity dispersion based virial radius can moreoverestimate velocity dispersion in comparison to X-ray based virial radius forlow mass systems. There is no significant difference between these two radialcuts for more massive systems. Independent of radial cut, overestimation ofvelocity dispersion can be created in case of existence of significantsubstructure and also compactness in X-ray emission which mostly occur in lowmass systems. We also present a comparison between X-ray galaxy groups andoptical galaxy groups detected using the Voronoi-Delaunay method (VDM) forDEEP2 data in this field.

X-Ray Groups of Galaxies in the Aegis Deep and Wide Fields