C.D.S. - SIMBAD4 rel 1.7 - 2019.10.14CEST23:48:37

2007A&A...461..423M - Astronomy and Astrophysics, volume 461, 423-431 (2007/1-2)

Evidence for strong evolution of the cosmic star formation density at high redshifts.


Abstract (from CDS):

Deep HST/ACS and VLT/ISAAC data of the GOODS-South field were used to look for high-redshift galaxies in the rest-frame UV wavelength range and to study the evolution of the cosmic star-formation density at z∼7. The GOODS-South area was surveyed down to a limiting magnitude of about (J+Ks)AB=25.5, looking for drop-out objects in the z'850 ACS filter. The large sampled area would allow for the detection of galaxies that are 20 times less numerous and 1-2mag brighter than similar studies using HST/NICMOS near-IR data. Two objects had initially been selected as promising candidates for galaxies at z∼7, but were subsequently dismissed and identified as Galactic brown dwarfs through detailed analysis of their morphology and Spitzer colors, as well as through spectroscopic information. As a consequence, we conclude that there are no galaxies at z∼7 down to our limiting magnitude in the field we investigated. Our non detection of galaxies at z∼7 provides clear evidence for a strong evolution of the luminosity function between z=6 and z=7, i.e. over a time interval of only ∼170Myr. Our constraints also provide evidence of a significant decline in the total star formation rate at z=7, which must be less than 40% of that at z=3 and 40-80% of that at z=6. We also derive an upper limit to the ionizing flux at z=7, which is only marginally consistent with what is required to completely ionize the Universe.

Abstract Copyright:

Journal keyword(s): Galaxy: formation - Galaxy: evolution - galaxies: high-redshift - galaxies: starburst - cosmology: observations - early Universe

Nomenclature: Table 1: [MBM2007] NNNNN (Nos 4419, 6968).

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
1 NAME CDFS 3223-4627 G 03 32 25.1100 -27 46 35.674           ~ 9 0
2 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 995 1
3 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1750 1
4 [BIB2006] CDFS-2388049537 G 03 32 38.8006 -27 49 53.656           ~ 17 0
5 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1215 0
6 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1801 1

    Equat.    Gal    SGal    Ecl

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