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

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

Kelly A. Douglass, Michael S. Vogeley and Renyue Cen
DWARF GALAXIES: FROM THE DEEP UNIVERSE TO THE PRESENT, v 14(S344), pp 369-372
01 Jan 2019
DOI: https://doi.org/10.1017/S1743921318006816
url
https://arxiv.org/abs/1706.07099View
Submitted Open Open Access (License Unspecified)

Abstract

Astronomy & Astrophysics Physical Sciences Science & Technology
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] lambda 3727 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.

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Domestic collaboration
Web of Science research areas
Astronomy & Astrophysics
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