Moircs deep survey. VIII. Evolution of star formation activity as a function of stellar mass in galaxies since z ∼ 3

M. Kajisawa, T. Ichikawa, T. Yamada, Y. K. Uchimoto, T. Yoshikawa, M. Akiyama, M. Onodera

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


We study the evolution of star formation activity of galaxies at 0.5 < z < 3.5 as a function of stellar mass, using very deep NIR data taken with the Multi-Object Infrared Camera and Spectrograph on the Subaru telescope in the GOODS-North region. The NIR imaging data reach K ∼ 23-24 Vega magnitude and they allow us to construct a nearly stellar-mass-limited sample down to ∼109.5-10 M even at z ∼ 3. We estimated star formation rates (SFRs) of the sample with two indicators, namely, the Spitzer/MIPS 24 μm flux and the rest-frame 2800 Å luminosity. The SFR distribution at a fixed Mstar shifts to higher values with increasing redshift at 0.5 < z < 3.5. More massive galaxies show stronger evolution of SFR at z ≳ 1. We found galaxies at 2.5 < z < 3.5 show a bimodality in their SSFR distribution, which can be divided into two populations by a constant SSFR of ∼ 2 Gyr-1. Galaxies in the low-SSFR group have SSFRs of ∼ 0.5-1.0 Gyr-1, while the high-SSFR population shows ∼ 10 Gyr-1. The cosmic SFR density (SFRD) is dominated by galaxies with Mstar = 1010-11M at 0.5 < z < 3.5, while the contribution of massive galaxies with M star = 1011-11.5 M shows a strong evolution at z > 1 and becomes significant at z ∼ 3, especially in the case with the SFR based on MIPS 24 μm. In galaxies with Mstar = 1010-11.5 M, those with a relatively narrow range of SSFR (≲1 dex) dominates the cosmic SFRD at 0.5 < z < 3.5. The SSFR of galaxies that dominate the SFRD systematically increases with redshift. At 2.5 < z < 3.5, the high-SSFR population, which is relatively small in number, dominates the SFRD. Major star formation in the universe at higher redshift seems to be associated with a more rapid growth of stellar mass of galaxies.

Original languageEnglish
Pages (from-to)129-145
Number of pages17
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 2010 Nov 1


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


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