TY - JOUR
T1 - Galaxy and mass assembly (gama)
T2 - The connection between metals, specific sfr and hi gas in galaxies: The z-ssfr relation
AU - Lara-López, M. A.
AU - Hopkins, A. M.
AU - López-Sánchez, A. R.
AU - Brough, S.
AU - Colless, M.
AU - Bland-Hawthorn, J.
AU - Driver, S.
AU - Foster, C.
AU - Liske, J.
AU - Loveday, J.
AU - Robotham, A. S.G.
AU - Sharp, R. G.
AU - Steele, O.
AU - Taylor, E. N.
PY - 2013/7
Y1 - 2013/7
N2 - We study the interplay between gas phase metallicity (Z), specific star formation rate (SSFR) and neutral hydrogen gas (HI) for galaxies of different stellar masses. Our study uses spectroscopic data from Galaxy and Mass Assembly and Sloan Digital Sky Survey (SDSS) starforming galaxies, as well as HI 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.
AB - We study the interplay between gas phase metallicity (Z), specific star formation rate (SSFR) and neutral hydrogen gas (HI) for galaxies of different stellar masses. Our study uses spectroscopic data from Galaxy and Mass Assembly and Sloan Digital Sky Survey (SDSS) starforming galaxies, as well as HI 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.
KW - Galaxies: Abundances
KW - Galaxies: Statistics.
KW - Galaxies:Fundamental parameters
KW - Galaxies:Star formation
UR - http://www.scopus.com/inward/record.url?scp=84880301691&partnerID=8YFLogxK
U2 - 10.1093/mnrasl/slt054
DO - 10.1093/mnrasl/slt054
M3 - Article
SN - 1745-3925
VL - 433
SP - L35-L39
JO - Monthly Notices of the Royal Astronomical Society: Letters
JF - Monthly Notices of the Royal Astronomical Society: Letters
IS - 1
M1 - slt054
ER -