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Star formation and environment in clusters up to z~2.2 | | A. Raichoor
; S. Andreon
; | | Date: |
28 Oct 2011 | | Abstract: | The dependence of galaxy star formation activity on environment - especially
in clusters - at high redshift is still poorly understood, as illustrated by
the still limited number of z>1.4 clusters on the one hand, and by the still
debated star formation-density relation at high redshift on the other hand. The
zphot~2.2 JKCS041 cluster allows to probe such environmental dependence of star
formation activity at an unprecedented combination of redshifts and
environments. Its study permits to enlarge the knowledge of high redshift
clusters and to put strong leverage on observational constraints for galaxy
evolution models. We analyze deep uastg’r’i’z’JHKs images from the
CFHTLS/WIRDS surveys, which cover JKCS041 cluster field. We first estimate
photometric redshifts based on multi-wavelength photometry. We then lead a
careful analysis to test the presence of a Butcher-Oemler effect. We work on
galaxies within 2 imesr200 and with masses >1.34 imes10^11 Msun, and use two
comparison clusters at z=0 and z=1 of similar mass. We estimate the radial
profiles of the fraction of blue galaxies, taking into account the star aging
with decreasing redshift. After confirming the high redshift nature of JKCS041,
we find no evidence for a Butcher-Oemler effect between z~2.2 and z~0 for
galaxies more massive than 1.34 imes10^11 Msun. In the cluster center, a
change greater than Deltafblue/Deltaz=0.16 between z~0 and z~2.2 would be
easily detected. We also find that JKCS041 shows a consistent and systematic
increase of the fraction of star-forming galaxies with cluster-centric
distance, hence with decreasing density, for both a M>1.34 imes10^11 Msun
selected sample and a lower mass sample. In particular, very few (less than
15%) star-forming galaxies are found within r200/2 among high mass
(M>1.34 imes10^11 Msun) galaxies. Our results show that the present-day star
formation-density relation is already in place at z~2.2. | | Source: | arXiv, 1110.6446 | | Services: | Forum | Review | PDF | Favorites | |
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