Galaxy and Mass Assembly (GAMA)

the connection between metals, specific sfr and hi gas in galaxies: the z-ssfr relation

M. A. Lara-López*, A. M. Hopkins, A. R. López-Sánchez, S. Brough, M. Colless, J. Bland-Hawthorn, S. Driver, C. Foster, J. Liske, J. Loveday, A. S G Robotham, R. G. Sharp, O. Steele, E. N. Taylor

*Corresponding author for this work

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article numberslt054
Pages (from-to)L35-L39
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume433
Issue number1
DOIs
Publication statusPublished - 11 May 2013

Keywords

  • galaxies: abundances
  • galaxies: fundamental parameters
  • galaxies: star formation
  • galaxies: statistics

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