Near-IR bright galaxies at z~2. Entering the spheroid formation epoch ?

Details Near-IR bright galaxies at z~2. Entering the spheroid formation epoch ? Near-IR bright galaxies at z~2. Entering the spheroid formation epoch ?

2003-08-26

arxiv.org/abs/astro-ph/0308456v1

Astrophys.J.600:L127-L130,2004

Astronomy and Astrophysics

Astrophysics

accepted on June 17. To appear on ApJ Letters

Scientific paper

10.1086/381020

Spectroscopic redshifts have been measured for 9 K-band luminous galaxies at 1.7 < z < 2.3, selected with Ks < 20 in the "K20 survey" region of the Great Observatories Origins Deep Survey area. Star formation rates (SFRs) of ~100-500 Msun/yr are derived when dust extinction is taken into account. The fitting of their multi-color spectral energy distributions indicates stellar masses M ~ 10^11 Msun for most of the galaxies. Their rest-frame UV morphology is highly irregular, suggesting that merging-driven starbursts are going on in these galaxies. Morphologies tend to be more compact in the near-IR, a hint for the possible presence of older stellar populations. Such galaxies are strongly clustered, with 7 out of 9 belonging to redshift spikes, which indicates a correlation length r_0 ~ 9-17 h^-1 Mpc (1 sigma range). Current semianalytical models of galaxy formation appear to underpredict by a large factor (about 30) the number density of such a population of massive and powerful starburst galaxies at z ~ 2. The high masses and SFRs together with the strong clustering suggest that at z ~ 2 we may have started to explore the major formation epoch of massive early-type galaxies.

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