| Issue |
A&A
Volume 426, Number 2, November I 2004
|
|
|---|---|---|
| Page(s) | 455 - 462 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361:20041015 | |
| Published online | 11 October 2004 | |
Assessing the galaxy population out to z ~ 2 using the Hubble Deep Field South*
1
Onsala Space Observatory, Chalmers University of Technology, 439 92 Onsala, Sweden e-mail: wiegert@physics.umanitoba.ca
2
Laboratory for Astronomy and Solar Physics, Goddard Space Flight Center, Greenbelt, MD 20771, USA
3
Catholic University of America, Washington, DC 20064, USA
Received:
2
April
2004
Accepted:
7
July
2004
In this work we use the Hubble Deep Field South (HDF-S) version 2 images
to assess the galaxy population out to 
.
We have used two methods of templates fitting of
the spectral energy distributions to obtain photometric
redshifts and classify the objects. The Bayesian photometric redshifts
gave better results when compared with 54 spectroscopic redshifts
available in the literature.
Analysis of the rest-frame colour distribution shows a bimodality out to 
.
We separated our sample in a blue and a red population at 
.
At low redshifts (
), ~60% of the galaxies have
whereas at higher redshifts ~60% of the galaxies are bluer
than 
. Although in low numbers, a population of early-type
galaxies (or heavily obscured low redshift galaxies) is seen out to 
.
Key words: cosmology: observations / galaxies: evolution / galaxies: statistics / galaxies: photometry
© ESO, 2004
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