The emergence of the Star Formation Main Sequence with redshift unfolded by JWST
arxiv(2024)
摘要
We investigate the correlation between stellar mass (M*) and star formation
rate (SFR) across the stellar mass range log10(M*/Msun) 6-11. We consider
almost 50,000 star-forming galaxies at z 3-7, leveraging data from
COSMOS/SMUVS, JADES/GOODS-SOUTH, and MIDIS/XDF. This is the first study
spanning such a wide stellar mass range without relying on gravitational
lensing effects. We locate our galaxies on the SFR-M* plane to assess how the
location of galaxies in the star-formation main sequence (MS) and starburst
(SB) region evolves with stellar mass and redshift. We find that the two
star-forming modes tend to converge at log10(M*/Msun) < 7, with all galaxies
found in the SB mode. By dissecting our galaxy sample in stellar mass and
redshift, we show that the emergence of the star-formation MS is stellar-mass
dependent: while in galaxies with log10(M*/Msun) > 9 the MS is already well in
place at z = 5-7, for galaxies with log10(M*/Msun) 7-8 it only becomes
significant at z<4. Overall, our results are in line with previous findings
that the SB mode dominates amongst low stellar-mass galaxies. The earlier
emergence of the MS for massive galaxies is consistent with galaxy downsizing.
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