Passively Evolving Early-type Galaxies at 1.4<z<2.5 in the Hubble Ultra Deep Field

Details Passively Evolving Early-type Galaxies at 1.4<z<2.5 in the Hubble Ultra Deep Field Passively Evolving Early-type Galaxies at 1.4<z<2.5 in the Hubble Ultra Deep Field

2005-03-04

arxiv.org/abs/astro-ph/0503102v1

Astrophys.J.626:680-697,2005

Astronomy and Astrophysics

Astrophysics

18 pages, 15 figures, ApJ in press

Scientific paper

10.1086/430104

We report on a complete sample of 7 luminous early-type galaxies in the Hubble Ultra Deep Field (UDF) with spectroscopic redshifts between 1.39 and 2.47 and to K<23 AB. Using the BzK selection criterion we have pre-selected a set of objects over the UDF which fulfill the photometric conditions for being passively evolving galaxies at z>1.4. Low-resolution spectra of these objects have been extracted from the HST+ACS grism data taken over the UDF by the GRAPES project. Redshift for the 7 galaxies have been identified based on the UV feature at rest frame 2640=1.7 appears to be roughly a factor of 2--3 smaller than that of their local counterparts, further supporting the notion that such massive and old galaxies are already ubiquitous at early cosmic times. Much smaller effective radii are derived for some of the objects compared to local massive ellipticals, which may be due to morphological K corrections, evolution, or the presence of a central point-like source. Nuclear activity is indeed present in a subset of the galaxies, as revealed by them being hard X-ray sources, hinting to AGN activity having played a role in discontinuing star formation.

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