8-12 juin, 2014

Résumé

Compact Massive Galaxies at Intermediate Redshift

Ivana Damjanov (Harvard-Smithsonian Center for Astrophysics)

Margaret J. Geller (Smithsonian Astrophysical Observatory), Ho Seong Hwang (Smithsonian Astrophysical Observatory), Igor Chilingarian (Smithsonian Astrophysical Observatory

Compact quiescent galaxies ('red nuggets') constitute a large fraction of distant massive quiescent systems, but were thought to disappear at low redshift. However, recent studies at z~0 have shown that their number density in the nearby Universe is not well constrained. Furthermore, the link between red nuggets routinely observed at high redshift and their rare local analogs and/or relics is still missing. We discovered a population of these objects at z~0.4 by searching the SDSS/BOSS database for photometric point sources exhibiting spectroscopic features of redshifted quiescent galaxies. We combed through the existing high-quality ground-based and HST images in the visible and near-IR wavelength range to confirm their compactness. Our targets fall in the locus of z~0 and z>1 red nuggets on the dynamical Fundamental Plane. We report on number densities of compact quiescent galaxies at 0.2<z<0.6, thus providing an important constraining factor for models of massive galaxy assembly.

(doit être confirmé par le SOC)