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28 March 2024
 
  » arxiv » astro-ph/9503101

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The morphological identification of the rapidly evolving population of faint galaxies
Karl Glazebrook ; Richard Ellis ; Basilio Santiago ; Richard Griffiths ;
Date 28 Mar 1995
Journal Mon.Not.Roy.Astron.Soc. 275 (1995) L19
Subject astro-ph
AffiliationInstitute of Astronomy, Cambridge) and Richard Griffiths (Johns Hopkins University
AbstractThe excess numbers of blue galaxies at faint magnitudes are a long-standing cosmological puzzle. We present new number-magnitude counts as a function of galactic morphology from the first deep fields of the Cycle 4 Hubble Space Telescope {it Medium Deep Survey} project. From a sample of 301 galaxies we define counts for elliptical, spiral and irregular/peculiar galaxies to $I=22$. We find two principal results. Firstly the elliptical and spiral galaxy counts both follow the predictions of high-normalisation no-evolution models at all magnitudes, indicating that regular Hubble types evolve only slowly to $zsim 0.5$. Secondly we find that irregular/peculiar galaxies, including multiple-peaked, possibly merging, objects, have a very steep number-magnitude relation and greatly exceed predictions based on proportions in local surveys. These systems make up half the total counts by $I=22$ and imply the rapidly-evolving component of the faint galaxy population has been identified.
Source arXiv, astro-ph/9503101
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