Star Formation at 4 < z < 6 from the Spitzer Large Area Survey with Hyper-Suprime-Cam (SPLASH)
Strauss, Michael A.; Capak, Peter; Scoville, Nick; Ilbert, Olivier; McCracken, Henry J.; Dunlop, James; Lee, Nicholas; Hsieh, Bau-Ching; Lin, Yen-Ting; Nagao, Tohru; Silverman, John D.; Lin, Lihwai; Hashimoto, Yasuhiro; Le Floc'h, Emeric; Taniguchi, Yoshiaki; Salvato, Mara; Petric, Andreea; Steinhardt, Charles L.; Speagle, Josh S.; Carollo, Marcella; Le Fevre, Olivier; Masters, Dan; Sanders, Dave; Sheth, Kartik
United States, Japan, Switzerland, United Kingdom, Taiwan, France, Germany
Abstract
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.