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Constraints to the evolution of Ly-Alpha bright galaxies between z=3 and z=6 | | C. Maier
; K. Meisenheimer
; E. Thommes
; H. Hippelein
; H. J. Roeser
; J. Fried
; B. von Kuhlmann
; S. Phleps
; C. Wolf
; | | Date: |
6 Feb 2003 | | Journal: | Astron.Astrophys. 402 (2003) 79-86 | | Subject: | astro-ph | | Affiliation: | 1,2), H. Hippelein , H. J. Roeser , J. Fried , B. von Kuhlmann , S. Phleps , C. Wolf (1,3) ( Max-Planck-Institut fuer Astronomie Heidelberg; Institut fuer theoretische Physik Heidelberg; Department of Physics Oxford | | Abstract: | Galaxies at high redshift with a strong Ly-Alpha emission line trace massive star formation in the absence of dust, and can therefore be regarded as a prime signature of the first major starburst in galaxies. We report results of the Ly-Alpha search within the Calar Alto Deep Imaging Survey (CADIS). With imaging Fabry-Perot interferometer CADIS can detect emission lines in three waveband windows free of night-sky emission lines at 700nm, 820nm, and 920nm. The typical flux detection limit for Ly-Alpha emission redshifted into these windows, Flim > 3X10^(-20) Wm^(-2), corresponds to (unobscured) star formation rates of >10Msun/yr at z=6. Candidate Ly-Alpha-emitting galaxies are selected from the total emission line sample, which contains more than 97% of objects at z<1.2, by the absence of flux below the Lyman limit (B-band "dropouts"), and the non-detection of secondary emission lines in narrow band filters. We have detected 5 bright Ly-Alpha-emitting galaxy candidates at z ~ 4.8, and 11 candidates at z ~ 5.7. For two of four observed Ly-Alpha candidates, one candidate at z ~ 4.8, and the other at z ~ 5.7, the emission line detected with the Fabry-Perot has been verified spectroscopically at the VLT. When compared to Ly-Alpha surveys at z<3.5 even the upper limits set by our list of candidates show that bright Ly-Alpha galaxies are significantly rarer at z>5 than the assumption of a non-evolving population would predict. Therefore we conclude that the Ly-Alpha bright phase of primeval star formation episodes reached its peak at redshifts between 3 and 6. | | Source: | arXiv, astro-ph/0302113 | | Services: | Forum | Review | PDF | Favorites | |
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