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arXiv · 1306.2262

Dependence of Nebular Heavy-Element Abundance on H I Content for Spiral Galaxies

Paul Robertson·Gregory A. Shields·Romeel Davé·Guillermo A. Blanc·Audrey Wright
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Abstract

We analyze the galactic H I content and nebular log(O/H) for 60 spiral galaxies in the Moustakas et al. (2006) spectral catalog. After correcting for the mass-metallicity relationship, we show that the spirals in cluster environments show a positive correlation for log(O/H) on DEF, the galactic H I deficiency parameter, extending the results of previous analyses of the Virgo and Pegasus I clusters. Additionally, we show for the first time that galaxies in the field obey a similar dependence. The observed relationship between H I deficiency and galactic metallicity resembles similar trends shown by cosmological simulations of galaxy formation including inflows and outflows. These results indicate the previously observed metallicity-DEF correlation has a more universal interpretation than simply a cluster's effects on its member galaxies. Rather, we observe in all environments the stochastic effects of metal-poor infall as minor mergers and accretion help to build giant spirals.

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Paul Robertson, Gregory A. Shields, Romeel Davé, Guillermo A. Blanc, Audrey Wright. 2013-06-10. Dependence of Nebular Heavy-Element Abundance on H I Content for Spiral Galaxies. https://doi.org/10.1088/0004-637x/773/1/4

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