The Environment of Massive Quiescent Compact Galaxies at $0.1<z<0.4$ in the COSMOS Field

Understand

We use Hectospec mounted on the 6.5-meter MMT to carry out a redshift survey of red ($r-i>0.2$, $g-r>0.8$, $r<21.3$) galaxies in the COSMOS field to measure the environments of massive compact quiescent galaxies at intermediate redshift.

• The $>90\%$ complete magnitude limited survey includes redshifts for 1766 red galaxies with $r < 20.8$ covering the central square degree of the field; $65\%$ of the redshifts in this sample are new.
• We select a complete magnitude limited quiescent sample based on the rest-frame $UVJ$ colors.
• When the density distribution is sampled on a scale of 2 Mpc massive compact galaxies inhabit systematically denser regions than the parent quiescent galaxy population.