SIMBAD references

2002A&A...396..847V - Astronomy and Astrophysics, volume 396, 847-855 (2002/12-4)

A VLT/FORS2 spectroscopic survey in the HDF-S.

VANZELLA E., CRISTIANI S., ARNOUTS S., DENNEFELD M., FONTANA A., GRAZIAN A., NONINO M., PETITJEAN P. and SARACCO P.

Abstract (from CDS):

We report on low-resolution multi-object spectroscopy of 65 objects from I(AB)≃20 to I(AB)≃25 in the HDF-S obtained with the VLT Focal Reducer/low dispersion Spectrograph (FORS2). 18 objects belong to the HDF-S proper, i.e. the WFPC2 deep area. 15 high-redshift galaxies with 2.0<z<3.5 (10 in the HDF-S proper) have been identified. The spectroscopic redshifts are in good agreement with the photometric ones derived from a χ2 minimization technique comparing the observed spectral energy distribution with synthetic libraries and with a new neural network (NN) approach. The dispersion with the former method is σz=0.16 whereas the latter provides σz=0.13. No ``catastrophic'' difference is encountered. The inferred star formation rates of the individual objects range from tens to a few hundreds of M/yr and the global star formation rate of the Universe at <z≥∼2.4 is estimated to be 0.15M/yr/Mpc3 with a statistical error of 0.04. Evidence for large-scale structure is found with two groups' redshifts observed at z≃2.1 and z≃2.7 and a pronounced low redshift peak around z≃0.58. An elliptical galaxy lensing a background object turns out to be at a redshift z=0.577.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - galaxies: evolution - galaxies: formation - galaxies: distances and redshifts

Nomenclature: Table 2: [VCA2002] NN (Nos 1-65).

CDS comments: Table 2, [VCA2002] 39 : misprint on position.

Simbad objects: 93

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