The DEEP2 Galaxy Redshift Survey: The Voronoi-Delaunay Method catalog of galaxy groups

Understand

We present a public catalog of galaxy groups constructed from the spectroscopic sample of galaxies in the fourth data release from the DEEP2 Galaxy Redshift Survey, including the Extended Groth Strip (EGS).

• The catalog contains 1165 groups with two or more members in the EGS over the redshift range 0<z<1.5 and 1295 groups at z>0.6 in the rest of DEEP2.
• 25% of EGS galaxies and 14% of high-z DEEP2 galaxies are assigned to galaxy groups.
• The groups were detected using the Voronoi-Delaunay Method, after it has been optimized on mock DEEP2 catalogs following similar methods to those employed in Gerke et al.