Near-infrared bright galaxies at z ~= 2. Entering the spheroid formation epoch
- Daddi E
- Cimatti A
- Renzini A
- Vernet J
- Conselice C
- Pozzetti L
- Mignoli M
- Tozzi P
- Broadhurst T
- Alighieri SD
- Fontana A
- Nonino M
- Rosati P
- Zamorani G
DOIAbstract
Spectroscopic redshifts have been measured for nine K-band luminous galaxies at 1.7<z<2.3, selected with K-s<20 in the K20 survey region of the Great Observatories Origins Deep Survey (GOODS) area. Star formation rates (SFRs) of &SIM;100-500 M-&ODOT; yr(-1) are derived when dust extinction is taken into account. The fitting of their multicolor spectral energy distributions indicates stellar masses of M&GSIM;10(11) M-&ODOT; 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 seven out of...
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