Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/213432
Title: | Structure, Kinematics, and Observability of the Large Magellanic Cloud's Dynamical Friction Wake in Cold versus Fuzzy Dark Matter |
Author: | Foote, Hayden R. Besla, Gurtina Mocz, Philip Garavito-Camargo, Nicolás Lancaster, Lachlan Sparre, Martin Cunningham, Emily C. Vogelsberger, Mark Gómez, Facundo A. Laporte, Chervin F. P. |
Keywords: | Halos (Meteorologia) Matèria fosca (Astronomia) Cinemàtica Núvols Halos (Meteorology) Dark matter (Astronomy) Kinematics Clouds |
Issue Date: | 2023 |
Publisher: | Institute of Physics (IOP) |
Abstract: | The Large Magellanic Cloud (LMC) will induce a dynamical friction (DF) wake on infall to the Milky Way (MW). The MW's stellar halo will respond to the gravity of the LMC and the dark matter (DM) wake, forming a stellar counterpart to the DM wake. This provides a novel opportunity to constrain the properties of the DM particle. We present a suite of high-resolution, windtunnel-style simulations of the LMC's DF wake that compare the structure, kinematics, and stellar tracer response of the DM wake in cold DM (CDM), with and without self-gravity, versus fuzzy DM (FDM) with ma = 10−23 eV. We conclude that the self-gravity of the DM wake cannot be ignored. Its inclusion raises the wake's density by ∼10%, and holds the wake together over larger distances (∼50 kpc) than if self-gravity is ignored. The DM wake's mass is comparable to the LMC's infall mass, meaning the DM wake is a significant perturber to the dynamics of MW halo tracers. An FDM wake is more granular in structure and is ∼20% dynamically colder than a CDM wake, but with comparable density. The granularity of an FDM wake increases the stars' kinematic response at the percent level compared to CDM, providing a possible avenue of distinguishing a CDM versus FDM wake. This underscores the need for kinematic measurements of stars in the stellar halo at distances of 70–100 kpc. |
Note: | Reproducció del document publicat a: https://doi.org/10.3847/1538-4357/ace533 |
It is part of: | Astrophysical Journal, 2023 |
URI: | http://hdl.handle.net/2445/213432 |
Related resource: | https://doi.org/10.3847/1538-4357/ace533 |
ISSN: | 0004-637X |
Appears in Collections: | Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB)) Articles publicats en revistes (Física Quàntica i Astrofísica) |
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841733.pdf | 2.77 MB | Adobe PDF | View/Open |
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