MOIRCS deep survey. II. Clustering Properties of K-band selected galaxies in GOODS-North Region

Takashi Ichikawa, Ryuji Suzuki, Chihiro Tokoku, Yuka Katsuno Uchimoto, Masahiro Konishi, Tomohiro Yoshikawa, Masaru Kajisawa, Masami Ouchi, Takashi Hamana, Masayuki Akiyama, Tetsuo Nishimura, Koji Omata, Ichi Tanaka, Toru Yamada

研究成果: Article査読

22 被引用数 (Scopus)


We present the first measurement of clustering properties of low-mass galaxies with a stellar mass down to M* ∼ 109 M⊙ at 1 < z <4 in 24.4 arcmin2 of the GOODS-North region with a depth of KAB ∼ 25. Luminous galaxies in the K-band have a larger correlation length than faint galaxies. For color-selected samples at 2 < z < 4, distant red galaxies with J - K > 1.3 show a large bias of b ∼ 7.2 ± 1.3 on scales of up to θ ∼ 100″ or 3.1 comoving Mpc, while blue galaxies with 0.5 < J - K < 1.3 have a weak clustering signal on large scales, but a possible strong small-scale excess at θ < 10″. For massive galaxies with M* ≳ 1010 M⊙, we estimate the correlation length and bias to be r0 ∼ 4.5h -1 Mpc and b - 1.9-3.5, which are much larger than those of low-mass (M* ∼ 109-1010 M⊙) galaxies. The comparison of our measurements with analytic CDM models constrains the properties of hosting dark halos, and indicates that the low-mass galaxies would be progenitors of galaxies with a typical luminosity of L ≲ L* in the local Universe. The blue galaxies in low-mass samples are more strongly clustered in more massive halos with higher occupation numbers than low-mass red galaxies. This fact suggests an environment effect due to the halo mass on the star-formation activity at high-z.

ジャーナルPublications of the Astronomical Society of Japan
出版ステータスPublished - 2007

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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