MOIRCS deep survey. I: DRG number counts

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

Research output: Contribution to journalReview articlepeer-review

37 Citations (Scopus)


We used very deep near-infrared imaging data taken with the Multi-Object InfraRed Camera and Spectrograph (MOIRCS) on the Subaru Telescope to investigate the number counts of Distant Red Galaxies (DRGs). We observed a 4′ × 7′ field in the Great Observatories Origins Deep Survey-North (GOODS-N), and our data reached J = 24.6 and K = 23.2 (5σ, Vega magnitude). The surface density of DRGs selected by J - K > 2.3 is 2.35 ±0.31 arcmin-2 at K < 22 and 3.54 ±0.38arcmin -2 at K < 23, respectively. These values are consistent with those in the GOODS-South and FIRES. Our deep and wide data suggest that the number counts of DRGs turn over at K ∼ 22, and the surface density of the faint DRGs with K > 22 is smaller than that expected from the number counts at the brighter magnitude. The result indicates that while there are many bright galaxies at 2 < z < 4 with the relatively old stellar population and/or heavy dust extinction, the number of faint galaxies with a similar red color is relatively small. Different behavior patterns of the number counts of the DRGs and bluer galaxies with 2 < zphot < 4 at K > 22 suggest that the mass-dependent color distribution, where most of the low-mass galaxies are blue, while more massive galaxies tend to have redder colors, had already been established at that epoch.

Original languageEnglish
Pages (from-to)951-956
Number of pages6
JournalPublication of the Astronomical Society of Japan
Issue number6
Publication statusPublished - 2006


  • Galaxies: evolution
  • Galaxies: high-redshift
  • Infrared: galaxies


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