Quiescent Compact Galaxies at Intermediate Redshift in the COSMOS Field. The Number Density

2015/01/20 by Damjanov, Ivana, Geller, Margaret J., Zahid, H. Jabran +1 · 1 citation
#Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences

paper · doi:10.48550/arxiv.1501.04976

Abstract

We investigate the evolution of compact galaxy number density over the redshift range 0.21 for equivalently selected compact samples. Small variations in the abundance of the COSMOS compact sources as a function of redshift correspond to known structures in the field. The constancy of the compact galaxy number density is robust and insensitive to the compactness threshold or the stellar mass range (for M_∗>10¹⁰ M_\odot). To maintain constant number density any size growth of high-redshift compact systems with decreasing redshift must be balanced by formation of quiescent compact systems at z<1.

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