Galaxy Evolution Viewed as Functions of Environment and Mass

  • Tadayuki Kodama
  • Masayuki Tanaka
  • Ichi Tanaka
  • Masaru Kajisawa
Conference paper
Part of the Astrophysics and Space Science Proceedings book series (ASSSP)

We present two large surveys of distant clusters currently being carried out with Subaru, making use of its great capability of wide-field study both in the optical and in the near-infrared. The optical surveys, called PISCES, have mapped out large scale structures in and around 8 distant clusters at 0.4 < z <1.3, composed of multiple filaments and clumps extended over 15-30 Mpc scale. From the photometric and spectroscopic properties of galaxies over a wide range in environment, we find that the truncation of galaxies is seen in the outskirts of clusters rather than in the cluster cores.We also see a clear environmental dependence of the down-sizing (progressively later quenching of star formation in smaller galaxies). The near-infrared surveys are being conducted with a new wide-field instrument targeting proto-clusters around high-zradio-loud galaxies up to z ~4. Most of these field are known to show a large number of Lyαand/or Hαemitters at the same redshifts of the radio galaxies. We see a clear excess of near-infrared selected galaxies (JHK s -selected galaxies as well as DRG) in these fields, and they are indeed proto-clusters with not only young emitters but also evolved populations. Spatial distribution of such NIR selected galaxies is filamentary and track similar structures traced by the emitters. There is an hint that the bright-end of the red sequence first appeared between z= 3 and 2.


Star Formation Large Scale Structure Radio Galaxy Distant Cluster Monthly Notice 
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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Tadayuki Kodama
    • 1
  • Masayuki Tanaka
    • 2
  • Ichi Tanaka
    • 3
  • Masaru Kajisawa
    • 1
  1. 1.National Astronomical Obseravtory of JapanMitakaJapan
  2. 2.Department of AstronomyUniversity of TokyoBunkyo-kuJapan
  3. 3.Subaru TelescopeNational Astronomical Observatory of JapanHiloUSA

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