Star formation at 4 < z < 6 from the Spitzer Large Area Survey with Hyper-Suprime-Cam (SPLASH)

Charles L. Steinhardt*, Josh S. Speagle, Peter Capak, John D. Silverman, Marcella Carollo, James Dunlop, Yasuhiro Hashimoto, Bau Ching Hsieh, Olivier Ilbert, Olivier Le Fevre, Emeric Le Floc'H, Nicholas Lee, Lihwai Lin, Yen Ting Lin, Dan Masters, Henry J. McCracken, Tohru Nagao, Andreea Petric, Mara Salvato, Dave SandersNick Scoville, Kartik Sheth, Michael A. Strauss, Yoshiaki Taniguchi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

159 Citations (Scopus)


Using the first 50% of data collected for the Spitzer Large Area Survey with Hyper-Suprime-Cam observations on the 1.8 deg2 Cosmological Evolution Survey we estimate the masses and star formation rates of 3398 M * > 1010 M star-forming galaxies at 4 < z < 6 with a substantial population up to M* ≳ 1011.5 M. We find that the strong correlation between stellar mass and star formation rate seen at lower redshift (the "main sequence" of star-forming galaxies) extends to z ∼ 6. The observed relation and scatter is consistent with a continued increase in star formation rate at fixed mass in line with extrapolations from lower-redshift observations. It is difficult to explain this continued correlation, especially for the most massive systems, unless the most massive galaxies are forming stars near their Eddington-limited rate from their first collapse. Furthermore, we find no evidence for moderate quenching at higher masses, indicating quenching either has not occurred prior to z ∼ 6 or else occurs rapidly, so that few galaxies are visible in transition between star-forming and quenched.

Original languageEnglish
Article numberL25
JournalAstrophysical Journal Letters
Issue number2
Publication statusPublished - 2014 Aug 20


  • galaxies: evolution

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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