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The Dwarfs Beyond: Relating Stellar and Halo Mass in Dwarf Galaxies to z ~ 1

Published online by Cambridge University Press:  10 April 2015

Sarah H. Miller
Sarah H. Miller*
Affiliation:
University of California, Irvine, email: [email protected]
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Abstract

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Do the kinematics and mass profiles of dwarf galaxies present a fundamental challenge to standard cold dark matter (CDM) models? New, deep spectroscopy using DEIMOS on Keck for hundreds of low stellar mass (107-109 M⊙ star-forming galaxies at intermediate redshift (0.2 < z < 1) addresses this inquiry in a way that is less subject to cosmic variance and environmental bias than previous, more local work. Half of this sample reveals resolved, doppler-shifted nebular emission, used to constrain rotation curves. From these we can construct the stellar mass Tully-Fisher relation to masses as low as ~107 M⊙, and a persistent discrepancy is found between predictions from simulations and models compared to our observations. We suggest on-going and future tests that will be more effective in distinguishing between the effects of baryonic feedback and alternative models of dark matter in this remarkable regime.

Keywords

galaxies: dwarfs - galaxies: evolution - galaxies: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S311: Galaxy Masses as Constraints of Formation Models , July 2014 , pp. 150 - 153
Copyright
Copyright © International Astronomical Union 2015 

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