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arXiv:astro-ph/0008493 (astro-ph)
[Submitted on 30 Aug 2000]

Title:How young are early-type cluster galaxies ? Quantifying the young stellar component in a rich cluster at z=0.41

Authors:I. Ferreras, J. Silk (Oxford)
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Abstract: We present a new method of quantifying the mass fraction of young stars in galaxies by analyzing near-ultraviolet (NUV)-optical colors. We focus our attention on early-type cluster galaxies, whose star formation history is at present undetermined. Rest-frame NUV (F300W) and optical (F702W) images of cluster Abell 851 (z=0.41) using HST/WFPC2 allow us to determine a NUV-optical color-magnitude relation, whose slope is incompatible with a monolithic scenario for star formation at high redshift. A degeneracy between a young stellar component and its fractional mass contribution to the galaxy is found, and a photometric analysis comparing the data with the predictions for a simple two-stage star formation history is presented. The analysis shows that some of the early-type galaxies may have fractions higher than 10% of the total mass content in stars formed at z~0.5. An increased scatter is found in the color-magnitude relation at the faint end, resulting in a significant fraction of faint blue early-type systems. This would imply that less massive galaxies undergo more recent episodes of star formation, and this can be explained in terms of a positive correlation between star formation efficiency and luminosity.
Comments: Accepted for publication in ApJ Letters. Uses this http URL. 5 pages with 3 embedded EPS figures
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0008493
  (or arXiv:astro-ph/0008493v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0008493
Journal reference: Astrophys.J. 541 (2000) L37
Related DOI: https://doi.org/10.1086/312898

Submission history

From: Ignacio Ferreras [view email]
[v1] Wed, 30 Aug 2000 16:38:28 UTC (57 KB)
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