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Massive starburst galaxies in a z=2.16 proto-cluster unveiled by panoramic H-alpha mapping | | Yusei Koyama
; Tadayuki Kodama
; Ken-ichi Tadaki
; Masao Hayashi
; Masayuki Tanaka
; Ian Smail
; Ichi Tanaka
; Jaron Kurk
; | | Date: |
3 Oct 2012 | | Abstract: | We present a panoramic narrow-band study of H-alpha emitters in the field of
the z=2.16 proto-cluster around PKS1138-262 using MOIRCS on the Subaru
Telescope. We find 83 H-alpha emitters down to a SFR(Ha)~10Msun/yr across a
~7’x7’ region centered on the radio galaxy, and identify ~10-Mpc scale
filaments of emitters running across this region. By examining the properties
of H-alpha emitters within the large-scale structure, we find that galaxies in
the higher-density environments at z=2.16 tend to have redder colours and
higher stellar masses compared to galaxies in more underdense regions. We also
find a population of H-alpha emitters with red colours ((J-Ks)>1), which are
much more frequent in the denser environments and which have apparently very
high stellar masses with M*>~10^11Msun, implying that these cluster galaxies
have already formed a large part of their stellar mass before z~2. Spitzer
Space Telescope 24-micron data suggests that many of these red H-alpha emitters
are bright, dusty starbursts (rather than quiescent sources). We also find that
the proto-cluster galaxies follow the same correlation between SFR and M* (the
"main sequence") of z~2 field star-forming galaxies, but with an excess of
massive galaxies. These very massive star-forming galaxies are not seen in our
similar, previous study of z~1 clusters, suggesting that their star-formation
activity has been shut off at 1<~z<~2. We infer that the massive red (but
active) galaxies in this rich proto-cluster are likely to be the products of
environmental effects, and they represent the accelerated galaxy formation and
evolution in a biased high density region in the early Universe. | | Source: | arXiv, 1210.0972 | | Services: | Forum | Review | PDF | Favorites | |
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