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Published August 20, 2014 | Submitted + Published
Journal Article Open

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


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.

Attached Files

Published - 2041-8205_791_2_L25.pdf

Submitted - 1407.7030v1.pdf


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August 20, 2023
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