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Issue A&A
Volume 418, Number 3, May II 2004
Page(s) 885 - 906
Section Extragalactic astronomy
DOI 10.1051/0004-6361:20034434



A&A 418, 885-906 (2004)
DOI: 10.1051/0004-6361:20034434

The FORS Deep Field spectroscopic survey

S. Noll1, D. Mehlert1, I. Appenzeller1, R. Bender2, A. Böhm3, A. Gabasch2, J. Heidt1, U. Hopp2, K. Jäger3, S. Seitz2, O. Stahl1, C. Tapken1 and B. L. Ziegler3

1  Landessternwarte Heidelberg, Königstuhl, 69117 Heidelberg, Germany
2  Universitätssternwarte München, Scheinerstraße 1, 81679 München, Germany
3  Universitäts-Sternwarte Göttingen, Geismarlandstraße 11, 37083 Göttingen, Germany

(Received 2 October 2003 / Accepted 30 January 2004 )

Abstract
We present a catalogue and atlas of low-resolution spectra of a well defined sample of 341 objects in the FORS Deep Field. All spectra were obtained with the FORS instruments at the ESO VLT with essentially the same spectroscopic set-up. The observed extragalactic objects cover the redshift range 0.1 to 5.0. 98 objects are starburst galaxies and QSOs at z > 2. Using this data set we investigated the evolution of the characteristic spectral properties of bright starburst galaxies and their mutual relations as a function of redshift. Significant evolutionary effects were found for redshifts 2 < z < 4. Most conspicuous are the increase of the average C IV absorption strength, of the dust reddening, and of the intrinsic UV luminosity, and the decrease of the average Ly $\alpha$ emission strength with decreasing redshift. In part the observed evolutionary effects can be attributed to an increase of the metallicity of the galaxies with cosmic age. Moreover, the increase of the total star-formation rates and the stronger obscuration of the starburst cores by dusty gas clouds suggest the occurrence of more massive starbursts at later cosmic epochs.


Key words: galaxies: high-redshift -- galaxies: starburst -- galaxies: fundamental parameters -- galaxies: evolution

Offprint request: S. Noll, snoll@lsw.uni-heidelberg.de

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