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29 March 2024
 
  » arxiv » astro-ph/9806208

 Article overview


Limits on the star formation rates of z>2 damped Ly-alpha systems from H-alpha spectroscopy
Andrew J. Bunker ; Stephen J. Warren ; D. L. Clements ; Gerard M. Williger ; P. C. Hewett ;
Date 15 Jun 1998
Subject astro-ph
AbstractWe present the results of a long-slit K-band spectroscopic search with CGS4 on UKIRT for H-alpha emission from the objects responsible for high-redshift (z > 2) damped Ly-alpha absorption systems. The objective was to measure the star-formation rates in these systems. However, no H-alpha emission was detected above our 3-sigma limits of f < 10E-19 W/m**2, corresponding to star formation rates < 10 M_sun/yr/h**2 (q_0=0.5). These upper limits are more meaningful than those from searches for Ly-alpha emission because the H-alpha line is unaffected by resonant scattering. For q_0=0.5 our limits are in conflict with the star formation rates predicted under the assumption that the high-z DLAs are the fully-formed galactic-disk counterparts of today’s massive spiral galaxies. Deeper spectroscopy is needed to test this picture for q_0=0.0. A programme of NICMOS imaging observations currently underway, combined with VLT spectroscopy, will provide a detailed picture of the link between DLAs and young galaxies.
Source arXiv, astro-ph/9806208
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