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Deep+ wide lensing surveys can measure the dark matter halos of dwarf galaxies

Leauthaud, Alexie and Singh, Sukhdeep and Luo, Yifei and Ardila, Felipe and Greco, Johnny P. and Capak, Peter and Greene, Jenny E. and Mayer, Lucio (2020) Deep+ wide lensing surveys can measure the dark matter halos of dwarf galaxies. Physics of the Dark Universe, 30 . Art. No. 100719. ISSN 2212-6864. doi:10.1016/j.dark.2020.100719.

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The advent of new deep+ wide photometric lensing surveys will open up the possibility of direct measurements of the dark matter halos of dwarf galaxies. The HSC wide survey will be the first with the statistical capability of measuring the lensing signal with high signal-to-noise at log(M∗)∼8. At this same mass scale, The Rubin Observatory LSST will have the most overall constraining power with a predicted signal-to-noise for the galaxy–galaxy lensing signal around dwarfs of S/N∼200. Roman and Rubin will have the greatest potential to push below the log(M∗)=7 mass scale thanks to the depth of their imaging data. Studies of the dark matter halos of dwarf galaxies at z∼0.1 with gravitational lensing are soon within reach. However, further work will be required to develop optimized strategies for extracting dwarfs samples from these surveys, determining redshifts, and accurately measuring lensing on small radial scales. Dwarf lensing will be a new and powerful tool to constrain the halo masses and inner density slopes of dwarf galaxies and to distinguish between baryonic feedback and modified dark matter scenarios.

Item Type:Article
Related URLs:
URLURL TypeDescription
Leauthaud, Alexie0000-0002-3677-3617
Luo, Yifei0000-0001-7729-6629
Ardila, Felipe0000-0002-6100-4852
Capak, Peter0000-0003-3578-6843
Additional Information:© 2020 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license ( Received 11 March 2020, Revised 11 September 2020, Accepted 15 September 2020, Available online 29 September 2020. This research was supported in part by the National Science Foundation under Grant No. NSF PHY-1748958. This material is based upon work supported by the National Science Foundation under Grant No. 1714610. AL acknowledges support from the David and Lucille Packard foundation, and from the Alfred P. Sloan Foundation. We acknowledge use of the lux supercomputer at UC Santa Cruz, funded by NSF MRI grant AST 1828315. FA is supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1842400. CRediT authorship contribution statement: Alexie Leauthaud: Conceptualization, Methodology, Writing. Sukhdeep Singh: Lensing error formalism. Yifei Luo: Lensing error computation. Felipe Ardila: Dwarf lensing signal computation. Johnny P. Greco: Mass completeness computations. Peter Capak: Mass completeness computations. Jenny E. Greene: Surface brightness considerations. Lucio Mayer: Writing. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
David and Lucille Packard FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
NSF Graduate Research FellowshipDGE-1842400
Subject Keywords:Dwarf galaxies; Dark matter; Gravitational lensing
Record Number:CaltechAUTHORS:20200930-132913937
Persistent URL:
Official Citation:Alexie Leauthaud, Sukhdeep Singh, Yifei Luo, Felipe Ardila, Johnny P. Greco, Peter Capak, Jenny E. Greene, Lucio Mayer, Deep+ wide lensing surveys can measure the dark matter halos of dwarf galaxies, Physics of the Dark Universe, Volume 30, 2020, 100719, ISSN 2212-6864, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105691
Deposited By: Tony Diaz
Deposited On:30 Sep 2020 20:36
Last Modified:16 Nov 2021 18:45

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