Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Nature of E+A Galaxies in Intermediate Redshift Clusters   [Abridged] Combining HST/WFPC2 mosaics with extensive ground-based
spectroscopy, we study the nature of E+A galaxies in three intermediate
redshift clusters (z=0.33, 0.58, & 0.83). From a sample of ~500 confirmed
cluster members, we isolate 46 E+A candidates to determine the E+A fraction and
study their physical properties. We find E+A's comprise a non-negligible
component (~7-13%) of the cluster population at these redshifts, and their
diverse nature indicates a heterogeneous parent population. Cluster E+A's span
the range in Hubble type and cover a wide range in luminosity, internal
velocity dispersion, and half-light radius. From their velocity dispersions and
half-light radii, we infer that the descendants of E+A's in our highest
redshift cluster are massive early-type galaxies. We find a decrease in the
characteristic E+A mass similar to the decrease in luminosity of rapidly
star-forming field galaxies since z~1, i.e. galaxy ``down-sizing.'' In
addition, we argue our statistics imply that >30% of the E-S0 members have
undergone an E+A phase; the true fraction could be 100% if the effects of E+A
down-sizing, an increasing E+A fraction with redshift, and the conversion of
spirals into early-types are also considered. Thus, the E+A phase may indeed be
an important stage in the transformation of star-forming galaxies into
early-type cluster members.

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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: hep-lat
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The categories of this paper are: q-bio
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: cs