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


Leauthaud, Alexie; Singh, Sukhdeep; Luo, Yifei; Ardila, Felipe; Greco, Johnny P; Capak, Peter; Greene, Jenny E; Mayer, Lucio (2020). Deep, wide lensing surveys can measure the dark matter halos of dwarf galaxies. Physics of the Dark Universe, 30:100719.

Abstract

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 . 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/N200. Roman and Rubin will have the greatest potential to push below the mass scale thanks to the depth of their imaging data. Studies of the dark matter halos of dwarf galaxies at 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.

Abstract

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 . 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/N200. Roman and Rubin will have the greatest potential to push below the mass scale thanks to the depth of their imaging data. Studies of the dark matter halos of dwarf galaxies at 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.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Astronomy and Astrophysics
Physical Sciences > Space and Planetary Science
Uncontrolled Keywords:Space and Planetary Science, Astronomy and Astrophysics
Language:English
Date:1 December 2020
Deposited On:15 Feb 2021 07:12
Last Modified:16 Feb 2021 21:00
Publisher:Elsevier
ISSN:2212-6864
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1016/j.dark.2020.100719

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