Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 433, Issue 1, Pages L35-L39Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnrasl/slt054
Keywords
galaxies: abundances; galaxies: fundamental parameters; galaxies: star formation; galaxies: statistics
Categories
Funding
- STFC (UK)
- ARC (Australia)
- AAO
- Alfred P. Sloan Foundation
- ARC [FS110200023]
- Australian Research Council [FS110200023] Funding Source: Australian Research Council
- STFC [ST/H008578/1, ST/I000976/1, ST/H00131X/1, ST/I505905/1, ST/I003088/1, ST/G001987/1, ST/J002291/1, ST/K003577/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J002291/1, ST/K003577/1, ST/H00131X/1, ST/I003088/1, ST/I000976/1, ST/G001987/1, ST/I505905/1, ST/H008578/1] Funding Source: researchfish
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We study the interplay between gas phase metallicity (Z), specific star formation rate (SSFR) and neutral hydrogen gas (H i) for galaxies of different stellar masses. Our study uses spectroscopic data from Galaxy and Mass Assembly and Sloan Digital Sky Survey (SDSS) star-forming galaxies, as well as H i detection from the Arecibo Legacy Fast Arecibo L-band Feed Array (ALFALFA) and Galex Arecibo SDSS Survey (GASS) public catalogues. We present a model based on the Z-SSFR relation that shows that at a given stellar mass, depending on the amount of gas, galaxies will follow opposite behaviours. Low-mass galaxies with a large amount of gas will show high SSFR and low metallicities, while low-mass galaxies with small amounts of gas will show lower SSFR and high metallicities. In contrast, massive galaxies with a large amount of gas will show moderate SSFR and high metallicities, while massive galaxies with small amounts of gas will show low SSFR and low metallicities. Using ALFALFA and GASS counterparts, we find that the amount of gas is related to those drastic differences in Z and SSFR for galaxies of a similar stellar mass.
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