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

Alexie Leauthaud, Sukhdeep Singh, Yifei Luo, Felipe Ardila, Johnny P. Greco, Peter Capak, Jenny E. Greene, Lucio Mayer

Research output: Contribution to journalArticlepeer-review

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 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.

Original languageEnglish (US)
Article number100719
JournalPhysics of the Dark Universe
Volume30
DOIs
StatePublished - Dec 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Dark matter
  • Dwarf galaxies
  • Gravitational lensing

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