2020MNRAS.496..111Z -
Mon. Not. R. Astron. Soc., 496, 111-124 (2020/July-3)
H I gas content of SDSS galaxies revealed by ALFALFA: implications for the mass-metallicity relation and the environmental dependence of H I in the local Universe.
ZU Y.
Abstract (from CDS):
The neutral hydrogen (H I) gas is an important barometer of recent star formation and metal enrichment activities in galaxies. I develop a novel statistical method for predicting the H I-to-stellar mass ratio, f_H I_, of galaxies from their stellar mass and optical colour, and apply it to a volume-limited galaxy sample jointly observed by the Sloan Digital Sky Survey and the Arecibo Legacy Fast ALFA survey. I eliminate the impact of the Malmquist bias against H I-deficient systems on the f_H I_ predictor by properly accounting for the H I detection probability of each galaxy in the analysis. The best-fitting f_H I_ predictor, with an estimated scatter of 0.272 dex, provides excellent description to the observed H I mass function. After defining an H I excess parameter as the deviation of the observed f_H I_ from the expected value, I confirm that there exists a strong secondary dependence of the mass-metallicity relation on H I excess. By further examining the 2D metallicity distribution on the specific star formation rate (sSFR) versus H I excess plane, I show that the metallicity dependence on H I is likely more fundamental than that on sSFR. In addition, I find that the environmental dependence of H I in the local Universe can be effectively described by the cross-correlation coefficient between H I excess and the red galaxy overdensity ρcc = - 0.18. This weak anticorrelation also successfully explains the observed dependence of H I clustering on f_H I_. My method provides a useful framework for learning H I gas evolution from the synergy between future H I and optical galaxy surveys.
Abstract Copyright:
© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
galaxies: abundances - galaxies: evolution - galaxies: formation - galaxies: ISM - galaxies: statistics - large-scale structure of Universe
Simbad objects:
1
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