The SFR-radius connection: data and implications for wind strength and halo concentration

Abstract

This paper is one in a series that explores the importance of radius as a second parameter in galaxy evolution. The topic investigated here is the relationship between star formation rate (SFR) and galaxy radius ($R_{\mathrm{e}}$) for main-sequence star-forming galaxies. The key observational result is that, over a wide range of stellar mass and redshift in both CANDELS and SDSS, there is little trend between SFR and $R_{\mathrm{e}}$ at fixed stellar mass. The Kennicutt-Schmidt law, or any similar density-related star formation law, then implies that smaller galaxies must have lower gas fractions than larger galaxies (at fixed $M_{\ast }$), and this is supported by observations of local star-forming galaxies. We investigate the implication by adopting the equilibrium "bathtub" model: the ISM gas mass is assumed to be constant over time and the net star formation rate is the difference between the accretion rate of gas onto the galaxy from the halo and the outflow rate due to winds. To match the observed null correlation between SFR and radius, the bathtub model requires that smaller galaxies at fixed mass have weaker galactic winds. Our hypothesis is that galaxies are a 2-dimensional family whose properties are set mainly by halo mass and concentration. Galaxy radius and accretion rate plausibly both depend on halo concentration, which predicts how wind strength should vary with $R_{\mathrm{e}}$ and SFR.

arXiv comment21 pages, 9 figures, ApJ accepted

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Cited by in corpus (7)

• What is Important? Morphological Asymmetries are Useful Predictors of Star Formation Rates of Star-forming Galaxies in SDSS Stripe 82
• SHAMe-SF: Predicting the clustering of star-forming galaxies with an enhanced abundance matching model
• Implications of Increased Central Mass Surface Densities for the Quenching of Low-mass Galaxies
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• Dust around massive stars is agnostic to galactic environment: New insights from PHAT/BEAST
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• The role of HI in regulating size growth of local galaxies