Steinhardt, Charles L. and Speagle, Josh S. and Capak, Peter and Silverman, John D. and Carollo, Marcella and Dunlop, James and Hashimoto, Yasuhiro and Hsieh, Bau-Ching and Ilbert, Olivier and Le Fèvre, Olivier and Le Floc'h, Emeric and Lee, Nicholas and Lin, Lihwai and Lin, Yen-Ting and Masters, Dan and McCracken, Henry J. and Nagao, Tohru and Petric, Andreea and Salvato, Mara and Sanders, Dave and Scoville, Nick and Sheth, Kartik and Strauss, Michael A. and Taniguchi, Yoshiaki (2014) Star Formation at 4 < z < 6 from the Spitzer Large Area Survey with Hyper-Suprime-Cam (SPLASH). Astrophysical Journal Letters, 791 (2). Art. No. L25. ISSN 2041-8205. http://resolver.caltech.edu/CaltechAUTHORS:20141002-133810713
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Using the first 50% of data collected for the Spitzer Large Area Survey with Hyper-Suprime-Cam observations on the 1.8 deg^2 Cosmological Evolution Survey we estimate the masses and star formation rates of 3398 M_* > 10^(10) M_☉ star-forming galaxies at 4 < z < 6 with a substantial population up to M_* ≳ 10^(11.5) 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.
|Additional Information:||© 2014 The American Astronomical Society. Received 2014 April 7; accepted 2014 June 22; published 2014 August 6. The authors would like to thank Steve Bickerton, Sean Carey, Martin Elvis, and Brian Feldstein for helpful comments.|
|Subject Keywords:||galaxies: evolution|
|Official Citation:||Star Formation at 4 < z < 6 from the Spitzer Large Area Survey with Hyper-Suprime-Cam (SPLASH) Charles L. Steinhardt et al. 2014 ApJ 791 L25|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||02 Oct 2014 21:53|
|Last Modified:||19 Oct 2015 23:11|
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