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Deep+Wide Lensing Surveys will Provide Exquisite Measurements of 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 (2019) Deep+Wide Lensing Surveys will Provide Exquisite Measurements of the Dark Matter Halos of Dwarf Galaxies. . (Unpublished)

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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, LSST will have the most overall constraining power with a predicted signal-to-noise for the galaxy-galaxy lensing signal around dwarfs of SN=200. WFIRST and LSST 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:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Leauthaud, Alexie0000-0002-3677-3617
Ardila, Felipe0000-0002-6100-4852
Capak, Peter0000-0003-3578-6843
Additional Information:We thank Clotilde Laigle for providing the COSMOS point source sensitivity. We thank Henk Hoekstra for proving the Euclid point source sensitivity. This material is based upon work supported by the National Science Foundation under Grant No. 1714610. This research was also supported in part by National Science Foundation under Grant No. NSF PHY11-25915. AL acknowledges support from the David and Lucille Packard foundation and from the Alfred P. Sloan foundation.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
David and Lucille Packard FoundationUNSPECIFIED
Alfred P. Sloan foundationUNSPECIFIED
Subject Keywords:dwarf galaxies, gravitational lensing
Record Number:CaltechAUTHORS:20190812-161714076
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97804
Deposited By: Tony Diaz
Deposited On:12 Aug 2019 23:26
Last Modified:26 Nov 2019 00:56

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