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28 March 2024
 
  » arxiv » astro-ph/9609020

 Article overview


Clustering around the radio-galaxy MRC0316-257 at z=3.14
Le Fevre ; O. ; Deltorn ; J.M. ; Crampton ; D. ; Dickinson ; M. ;
Date 3 Sep 1996
Subject astro-ph
AffiliationObservatoire de Paris), Deltorn, J.M. (Observatoire de Paris), Crampton, D. (Dominion Astrophysical Observatory), Dickinson, M. (STScI
AbstractWe report here the spectroscopic identification of galaxies in the neighborhood of the radio-galaxy MRC0316-257, at a redshift $zsim3.14$. Candidate cluster galaxies were selected from deep V and I images combined with narrow band imaging at the wavelength of redshifted Ly$alpha$. Follow-up multi-slit spectroscopy has allowed confirmation of the redshift of the radio-galaxy, $z=3.1420pm0.0020$, and identification of two associated galaxies at redshifts $z=3.1378pm0.0028$ and $z=3.1351pm0.0028$ respectively. The first galaxy is 0.3 $h_{50}^{-1}$ Mpc from the radio-galaxy, is resolved with an intrinsic size $11.6pm h_{50}^{-1}$ kpc, and shows $Lyalpha$ in emission with rest $W_{Lyalpha}=55pm14$AA. In addition, its extremely blue $V-I$ color might possibly indicate a proto-galaxy forming a first generation of stars in a low dust medium. The second galaxy is 1.3 $h_{50}^{-1}$ Mpc away from the radio-galaxy, is marginally resolved and, in addition to Ly$alpha$ in emission, shows CIV in emission with a broad component indicating the contribution from an AGN. The comoving density of galaxies with $V<23.8$ and a $Lyalpha$ flux $>10^{-16}$ ergcm$^{-2}$sec$^{-1}$ in the vicinity of MRC0316-257 is $sim2.5 imes10^{-3}h^3_{50}Mpc^{-3}$, significantly higher than the expected background density of field galaxies with similar properties, and might indicate a rich cluster or proto-cluster environment.
Source arXiv, astro-ph/9609020
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