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Influence of the Void Environment on Chemical Abundances in Dwarf Galaxies and Implications for Connecting Star Formation and Halo Mass

Published online by Cambridge University Press:  30 October 2019

Kelly A. Douglass Open the ORCID record for Kelly A. Douglass [Opens in a new window] ,
Michael S. Vogeley  and
Renyue Cen
Kelly A. Douglass*
Affiliation:
Department of Physics, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA email: [email protected]
Michael S. Vogeley
Affiliation:
Department of Physics, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA email: [email protected]
Renyue Cen
Affiliation:
Department of Astrophysics, Princeton University, Peyton Hall, Princeton, NJ, 05844, USA
*
†Present address: Department of Physics & Astronomy, University of Rochester, 500 Wilson Blvd., Rochester, NY 14611, USA.
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Abstract

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We study how the void environment affects the chemical evolution of galaxies by comparing the metallicity of dwarf galaxies in voids with dwarf galaxies in denser regions. Using spectroscopic observations from SDSS DR7, we estimate oxygen and nitrogen abundances of 889 void dwarf galaxies and 672 dwarf galaxies in denser regions. A substitute for the [OII] λ3727 doublet is developed, permitting oxygen abundance estimates of SDSS dwarf galaxies at all redshifts with the direct method. We find that void dwarf galaxies have about the same oxygen abundances and slightly lower N/O ratios than dwarf galaxies in denser environments. The lower N/O ratios seen in void dwarf galaxies may indicate both delayed star formation and a dependence of cosmic downsizing on the large-scale environment. Similar oxygen abundances in the two dwarf galaxy populations might be evidence of larger ratios of dark matter halo mass to stellar mass in voids.

Keywords

galaxies: abundancesgalaxies: dwarfgalaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 369 - 372
Copyright
© International Astronomical Union 2019 

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