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26 April 2024 |
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Deep+Wide Lensing Surveys will Provide Exquisite Measurements of 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
; | | Date: |
4 May 2019 | | 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, 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. | | Source: | arXiv, 1905.1433 | | Services: | Forum | Review | PDF | Favorites | |
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