Artículo de revista
Star formation in distant red galaxies: Spitzer observations in the Hubble Deep Field-South
Fecha
2006-01-01Registro en:
ASTROPHYSICAL JOURNAL Volume: 636 Issue: 1 Pages: L17-L20 Part: Part 2 Published: JAN 1 2006
0004-637X
Autor
Webb, Tracy M. A.
van Dokkum, Pieter
Egami, Eiichi
Fazio, Giovanni
Franx, Marijn
Gawiser, Eric
Herrera, David
Huang, Jiasheng
Labbé, Ivo
Lira Teillery, Paulina
Marchesini, Danilo
Maza Sancho, José
Quadri, Ryan
Rudnick, Gregory
Werf, Paul van der
Institución
Resumen
We present Spitzer 24 mu m imaging of 1.5 < z < 2.5 distant red galaxies (DRGs) in the 10' x 10' extended Hubble Deep Field-South of the Multiwavelength Survey by Yale-Chile. We detect 65% of the DRGs with K-AB < 23.2 mag at S-24 mu m >= 40 mu Jy and conclude that the bulk of the DRG population is dusty active galaxies. A mid-infrared (MIR) color analysis with IRAC data suggests that the MIR fluxes are not dominated by buried AGNs, and we interpret the high detection rate as evidence for a high average star formation rate of < SFR > = 130 +/- 30 M-circle dot yr(-1). From this, we infer that DRGs are important contributors to the cosmic star formation rate density at z similar to 2, at a level of similar to 0.02 M-circle dot yr(-1) Mpc(-3) to our completeness limit of K-AB = 22.9 mag.