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 nine belonging to redshift spikes, which indicates a correlation length of r(0)&SIM;9-17 h(-1) Mpc (1 ς range). Current semianalytical models of galaxy formation appear to underpredict by a large factor (&GSIM;30) the number density of such a population of massive and powerful starburst galaxies at z&SIM;2. The high masses and SFRs, together with the strong clustering, suggest that at z&SIM;2 we may have started to explore the major formation epoch of massive early-type galaxies.

Near-infrared bright galaxies at z ~= 2. Entering the spheroid formation epoch

ROSATI, Piero;
2004

Abstract

Spectroscopic redshifts have been measured for nine K-band luminous galaxies at 1.7
2004
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, Piero; Zamorani, G.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1854040
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 141
  • ???jsp.display-item.citation.isi??? 159
social impact