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The Dwarfs beyond: The Stellar-to-halo Mass Relation for a New Sample of Intermediate Redshift Low-mass Galaxies

Miller, Sarah H. and Ellis, Richard S. and Newman, Andrew B. and Benson, Andrew (2014) The Dwarfs beyond: The Stellar-to-halo Mass Relation for a New Sample of Intermediate Redshift Low-mass Galaxies. Astrophysical Journal, 782 (2). Art. No. 115. ISSN 0004-637X. doi:10.1088/0004-637X/782/2/115.

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A number of recent challenges to the standard ΛCDM paradigm relate to discrepancies that arise in comparing the abundance and kinematics of local dwarf galaxies with the predictions of numerical simulations. Such arguments rely heavily on the assumption that the Local Volume's dwarf and satellite galaxies form a representative distribution in terms of their stellar-to-halo mass ratios. To address this question, we present new, deep spectroscopy using DEIMOS on Keck for 82 low-mass (10^7-10^9 M_☉), star-forming galaxies at intermediate redshift (0.2 < z < 1). For 50% of these we are able to determine resolved rotation curves using nebular emission lines and thereby construct the stellar mass Tully-Fisher relation to masses as low as 10^7 M_☉. Using scaling relations determined from weak lensing data, we convert this to a stellar-to-halo mass relation for comparison with abundance matching predictions. We find a discrepancy between our observations and the predictions from abundance matching in the sense that we observe 3-12 times more stellar mass at a given halo mass. We suggest possible reasons for this discrepancy, as well as improved tests for the future.

Item Type:Article
Related URLs:
URLURL TypeDescription
Ellis, Richard S.0000-0001-7782-7071
Newman, Andrew B.0000-0001-7769-8660
Benson, Andrew0000-0001-5501-6008
Additional Information:© 2014 American Astronomical Society. Received 2013 October 2; accepted 2014 January 7; published 2014 February 4. S.H.M. thanks the Rhodes Trust, the British Federation of Women Graduates, the sub-department of Astrophysics and New College at the University of Oxford, the University of California, Riverside, and the California Institute of Technology for supporting her work. We thank the referee for his helpful comments which have improved the quality of this work. The spectroscopic data was secured with the W. M. Keck Observatory on Mauna Kea. We thank the observatory staff for their dedication and support. The authors recognize and acknowledge the cultural role and reverence that the summit of Mauna Kea has always had with the indigenous Hawaiian community, and we are most fortunate to have the opportunity to conduct observations from this mountain. Facilities: Keck:II (DEIMOS), HST (WFC3/IR).
Funding AgencyGrant Number
British Federation of Women GraduatesUNSPECIFIED
University of OxfordUNSPECIFIED
University of California, RiversideUNSPECIFIED
Subject Keywords:galaxies: dwarf; galaxies: evolution; galaxies: fundamental parameters; galaxies: kinematics and dynamics
Issue or Number:2
Record Number:CaltechAUTHORS:20140520-081436664
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Official Citation:The Dwarfs beyond: The Stellar-to-halo Mass Relation for a New Sample of Intermediate Redshift Low-mass Galaxies Sarah H. Miller et al. 2014 ApJ 782 115
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45832
Deposited By: Ruth Sustaita
Deposited On:22 May 2014 17:22
Last Modified:10 Nov 2021 17:17

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