摘要
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.
原文 | 英語 |
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文章編號 | L25 |
期刊 | Astrophysical Journal Letters |
卷 | 791 |
發行號 | 2 |
DOIs | |
出版狀態 | 已發佈 - 2014 8月 20 |
ASJC Scopus subject areas
- 天文和天體物理學
- 空間與行星科學