On the role of the post-starburst phase in the buildup of the red sequence of intermediate-redshift clusters

Gabriella De Lucia, Bianca M. Poggianti, Claire Halliday, Bo Milvang-Jensen, Stefan Noll, Ian Smail, Dennis F Zaritsky

Research output: Contribution to journalArticle

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Abstract

We present new deep spectroscopic observations of 0.05-0.5 L * galaxies in one cluster (cl1232.5-1250) drawn from the ESO (European Southern Observatory) Distant Cluster Survey (EDisCS) sample, at z = 0.54. The new data extend the spectroscopy already available for this cluster by about 1 mag. The cluster has a large fraction of passive galaxies and exhibits a well-defined and relatively tight colour-magnitude relation. Among spectroscopic members, only six galaxies are classified as 'post-starburst' (k+a). For another EDisCS cluster at similar redshift and with as deep spectroscopy, no member is found to have a k+a spectrum. The low measured numbers of post-starburst systems appear to be inadequate to explain the observed increase of faint red galaxies at lower redshift, even when accounting for the infall of new galaxies on to the cluster. Post-starburst galaxies represent a possible channel to move galaxies from the blue star-forming cloud to the red sequence, but the available data suggest this is not the dominant channel in galaxy clusters. If the galaxies at the faint end of the red sequence in nearby clusters originate from the blue galaxies observed in distant galaxy clusters, the transformation must have occurred primarily through physical processes that do not lead to a post-starburst phase. In addition, our data exclude a large population of k+a galaxies at faint magnitudes, as found in the Coma cluster.

Original languageEnglish (US)
Pages (from-to)68-77
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume400
Issue number1
DOIs
StatePublished - Nov 2009

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galaxies
observatory
spectroscopy
European Southern Observatory
blue stars
starburst galaxies
coma
color
physical process

Keywords

  • Galaxies: clusters: general
  • Galaxies: evolution
  • Galaxies: fundamental parameters

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

On the role of the post-starburst phase in the buildup of the red sequence of intermediate-redshift clusters. / De Lucia, Gabriella; Poggianti, Bianca M.; Halliday, Claire; Milvang-Jensen, Bo; Noll, Stefan; Smail, Ian; Zaritsky, Dennis F.

In: Monthly Notices of the Royal Astronomical Society, Vol. 400, No. 1, 11.2009, p. 68-77.

Research output: Contribution to journalArticle

De Lucia, Gabriella ; Poggianti, Bianca M. ; Halliday, Claire ; Milvang-Jensen, Bo ; Noll, Stefan ; Smail, Ian ; Zaritsky, Dennis F. / On the role of the post-starburst phase in the buildup of the red sequence of intermediate-redshift clusters. In: Monthly Notices of the Royal Astronomical Society. 2009 ; Vol. 400, No. 1. pp. 68-77.
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