The colour-magnitude relations of ClJ1226.9+3332, a massive cluster of galaxies at z=0.89

Details The colour-magnitude relations of ClJ1226.9+3332, a massive cluster of galaxies at z=0.89 The colour-magnitude relations of ClJ1226.9+3332, a massive cluster of galaxies at z=0.89

2006-02-06

arxiv.org/abs/astro-ph/0602140v1

Mon.Not.Roy.Astron.Soc.368:769-780,2006

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS. 14 pages, 5 figures

Scientific paper

10.1111/j.1365-2966.2006.10143.x

(Abridged) The colour-magnitude relations of one of the most massive, high redshift clusters of galaxies known have been studied. Photometry has been measured in the V, R, I, z, F606W, F814W, J and K bands to a depth of K*+2.5 and spectroscopy confirms 27 K band selected cluster members. The V-K colours are equivalent to a rest-frame colour of ~2700A-J, and provide a very sensitive measure of star-formation activity. HST ACS imaging has been used to morphologically classify the galaxies. The cluster has a low early-type fraction compared to nearby clusters, with only 33% of the cluster members having types E or S0. The early-type member galaxies form a clear red-sequence in all colours. The scatter and slope of the relations show no evolution compared to the equivalent Coma cluster relations, suggesting the stellar populations are already very old. The normalisation of the relations has been compared to models based on synthetic stellar populations, and are most consistent with stellar populations forming at z>3. Some late-type galaxies were found to lie on the red-sequence, suggesting that they have very similar stellar populations to the early-types. These results present a picture of a cluster in which the early-type galaxies are all old, but in which there must be future morphological transformation of galaxies to match the early-type fraction of nearby clusters. In order to preserve the tight colour-magnitude relation of early-types seen in nearby clusters, the late-type galaxies must transform their colours, through the cessation of star-formation, before the morphological transformation occurs. Such evolution is observed in the late-types lying on the colour-magnitude relation.

Affiliated with

Also associated with

No associations

Rating

The colour-magnitude relations of ClJ1226.9+3332, a massive cluster of galaxies at z=0.89 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The colour-magnitude relations of ClJ1226.9+3332, a massive cluster of galaxies at z=0.89, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The colour-magnitude relations of ClJ1226.9+3332, a massive cluster of galaxies at z=0.89 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-62484