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The cosmic web of dwarf galaxies in a warm versus cold dark matter universe: mock galaxies in CDM and WDM simulations
conference contribution
posted on 2023-06-09, 18:32 authored by Darren S Reed, Aurel Schneider, Doug Potter, Joachim Stadel, Ben Moore, Robert E SmithRobert E SmithUsing cosmological simulations, we show that the cosmic web of dwarf galaxies in a warm dark matter (WDM) universe, wherein low mass halo formation is heavily suppressed, is nearly indistinguishable to that of a cold dark matter (CDM) universe whose low mass halos are not seen because galaxy formation is suppressed below some threshold mass. Low mass warm dark matter halos are suppressed nearly equally in all environments. For example, WDM voids in the galaxy distribution are neither larger nor emptier than CDM voids, once normalized to the same total galaxy number density and assuming galaxy luminosity scales with halo mass. It is thus a challenge to find hints about the dark matter particle in the cosmic web of galaxies. However, if the scatter between dwarf galaxy luminosity and halo properties is large, low mass CDM halos would sometimes host bright galaxies thereby populating voids that would be empty in WDM. Future surveys that will capture the small scale clustering in the local volume could thus help determine whether the CDM problem of the over-abundance of small halos with respect to the number density of observed dwarf galaxies has a cosmological solution or an astrophysical solution.
History
Publication status
- Published
File Version
- Published version
Journal
Proceedings of the MG14 Meeting on General RelativityPublisher
World ScientificExternal DOI
Volume
2017Page range
2453-2458Event name
The Fourteenth Marcel Grossmann MeetingEvent location
Rome, ItalyEvent type
conferenceEvent date
12 – 18 July 2015ISBN
9789813226593Department affiliated with
- Mathematics Publications
Research groups affiliated with
- Astronomy Centre Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2019-08-01First Open Access (FOA) Date
2019-08-01First Compliant Deposit (FCD) Date
2019-07-30Usage metrics
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