Tuesday, June 11, 2013

1306.2262 (Paul Robertson et al.)

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

Paul Robertson, Gregory A. Shields, Romeel Davé, Guillermo A. Blanc, Audrey Wright
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.
View original: http://arxiv.org/abs/1306.2262

No comments:

Post a Comment