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

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Po-Feng Wu ,
Rolf-Peter Kudritzki ,
R. Brent Tully  and
J. D. Neill
Po-Feng Wu
Affiliation:
University of Hawaii, Institute for Astronomy, 2680 Woodlawn Drive, HI 96822, USA
Rolf-Peter Kudritzki
Affiliation:
University of Hawaii, Institute for Astronomy, 2680 Woodlawn Drive, HI 96822, USA University Observatory Munich, Scheinerstr. 1, D-81679 Munich, Germany
R. Brent Tully
Affiliation:
University of Hawaii, Institute for Astronomy, 2680 Woodlawn Drive, HI 96822, USA
J. D. Neill
Affiliation:
California Institute of Technology, 1200 E. California Blvd. MC 278-17, Pasadena, CA 91125, USA
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Abstract

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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.

Keywords

galaxies: abundances galaxies: formation galaxies: spiral
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , E83
Copyright
Copyright © International Astronomical Union 2016 

References

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