SIMBAD references

2000ApJ...541L..37F - Astrophys. J., 541, L37-L40 (2000/October-1)

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


Abstract (from CDS):

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 Hubble Space Telescope/WFPC2 allow us to determine an 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.

Abstract Copyright:

Journal keyword(s): Galaxies: Clusters: Individual: Name: Abell 851 - Galaxies: Clusters: Individual: Alphanumeric: Cl 0939+4713 - Galaxies: Elliptical and Lenticular, cD - Galaxies: Evolution - Galaxies: Formation

Nomenclature: Table 4: [DG92] 4-NNN N=5 added.

Status at CDS:  

CDS comments: T.1 : Galaxies 2016 and 833 not identified (not in [DG92] 4-...)

Simbad objects: 10

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