Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-06
Astron.Astrophys. 420 (2004) 125-133
Astronomy and Astrophysics
Astrophysics
10 pages, 5 figures. Accepted for publication on A&A
Scientific paper
10.1051/0004-6361:20040101
[abr] We report the analysis of three galaxies selected in the Hubble Deep Field South at Ks<22 on the basis of their unusually red near-IR color J-K>3. We have used population synthesis models to constrain their redshifts and their stellar masses. One galaxy is at redshift z_p~2.4 while the other two are at z_p~2.9-3.0. All three galaxies have already assembled a stellar mass of about 10^{11} M_sun at the observed redshift placing the possible merging event of their formation at z>3.5. The inferred mass weighted age of their stellar populations implies that the bulk of the stars formed at z_f>3.5. The resulting co-moving density of M_{stars}>10^{11} M_sun galaxies at
Arnouts Stephane
Cristiani Stefano
D'Odorico Sandro
Fontana Adriano
Giallongo Emanuele
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