Galaxy And Mass Assembly (GAMA): the dependence of star formation on surface brightness in low-redshift galaxies
Abstract
The star-formation rate in galaxies is well known to correlate with stellar mass (the 'star-forming main sequence'). Here, we extend this further to explore any additional dependence on galaxy surface brightness, a proxy for stellar mass surface density. We use a large sample of low-redshift (z ≤ 0.08) galaxies from the Galaxy And Mass Assembly survey which have both spectral energy distribution (SED) derived star-formation rates and photometric bulge-disc decompositions, the latter providing measures of disc surface brightness and disc masses. Using two samples, one of galaxies fitted by a single component with Sérsic index below 2 and one of the discs from two-component fits, we find that once the overall mass dependence of star-formation rate is accounted for, there is no evidence in either sample for a further dependence on stellar surface density.
- Publication:
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Monthly Notices of the Royal Astronomical Society
- Pub Date:
- February 2023
- DOI:
- arXiv:
- arXiv:2211.15998
- Bibcode:
- 2023MNRAS.518.5475P
- Keywords:
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- galaxies: photometry;
- galaxies: star formation;
- galaxies: structure;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- Accepted for publication in MNRAS