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1 results

  • How surface density of galaxy disks affects metallicity? Outflow and Accretion

  • Part of
  • Po-Feng Wu, Rolf-Peter Kudritzki, R. Brent Tully, J. D. Neill
  • Journal:
    Proceedings of the International Astronomical Union / Volume 11 / Issue S315 / August 2015
    Published online by Cambridge University Press:
    12 September 2016, E83
    Print publication:
    August 2015
    • Article
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  • In this study, we examine the effect of surface density of disks on chemical evolution of galaxies. We find that, higher surface brightness galaxies on average possess higher gas-phase metallicity compared to lower surface brightness galaxies with the same stellar and gas mass. The surface brightness effect is more significant for low-mass galaxies. Using an analytical model of chemical evolution involving gas outflow and accretion, we find that the surface brightness dependence can be attributed to the strength of inflowing pristine gas. Galaxies with lower surface brightness experience stronger inflow than galaxies with a higher surface brightness of a similar mass.