Under the FIRElight: Stellar Tracers of the Local Dark Matter Velocity Distribution in the Milky Way

Necib, Lina; Lisanti, Mariangela; Garrison-Kimmel, Shea; Wetzel, Andrew; Sanderson, Robyn; Hopkins, Philip F.; Faucher-Giguère, Claude-André; Kereš, Dušan

doi:10.3847/1538-4357/ab3afc

Title: Under the FIRElight: Stellar Tracers of the Local Dark Matter Velocity Distribution in the Milky Way

Journal Article · 18 September 2019 · The Astrophysical Journal (Online)

DOI: https://doi.org/10.3847/1538-4357/ab3afc · OSTI ID:1600644

^[1]; Lisanti, Mariangela ^[2];

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California Institute of Technology (CalTech), Pasadena, CA (United States); Princeton University
Princeton Univ., NJ (United States)
California Institute of Technology (CalTech), Pasadena, CA (United States)
Univ. of California, Davis, CA (United States)
Univ. of Pennsylvania, Philadelphia, PA (United States); Flatiron Inst., New York, NY (United States)
Northwestern Univ., Evanston, IL (United States)
Univ. of California, San Diego, CA (United States)

The Gaia era opens new possibilities for discovering the remnants of disrupted satellite galaxies in the Solar neighborhood. If the population of local accreted stars is correlated with the dark matter sourced by the same mergers, one can then map the dark matter distribution directly. Using two cosmological zoom-in hydrodynamic simulations of Milky Way-mass galaxies from the Latte suite of Fire-2 simulations, we find a strong correlation between the velocity distribution of stars and dark matter at the solar circle that were accreted from luminous satellites. This correspondence holds for dark matter that is either relaxed or in kinematic substructure called debris flow, and is consistent between two simulated hosts with different merger histories. The correspondence is more problematic for streams because of possible spatial offsets between the dark matter and stars. Here, we demonstrate how to reconstruct the dark matter velocity distribution from the observed properties of the accreted stellar population by properly accounting for the ratio of stars to dark matter contributed by individual mergers. After demonstrating this method using the Fire-2 simulations, we apply it to the Milky Way and use it to recover the dark matter velocity distribution associated with the recently discovered stellar debris field in the Solar neighborhood. Finally, based on results from Gaia, we estimate that $$42^{+26}_{-22}$$% of the local dark matter that is accreted from luminous mergers is in debris flow.

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Research Organization:: The Trustees of Princeton University

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); NASA; National Science Foundation (NSF); Alfred P. Sloan Foundation

Grant/Contract Number:: SC0007968; SC0011632

OSTI ID:: 1600644

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 883; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Gaia reveals a metal-rich in-situ component of the local stellar halo Bonaca, Ana; Conroy, Charlie; Wetzel, Andrew arXiv https://doi.org/10.48550/arxiv.1704.05463	text	January 2017
The Metal-Poor Stellar Halo in RAVE-TGAS and its Implications for the Velocity Distribution of Dark Matter Herzog-Arbeitman, Jonah; Lisanti, Mariangela; Necib, Lina arXiv https://doi.org/10.48550/arxiv.1708.03635	text	January 2017
Modelling chemical abundance distributions for dwarf galaxies in the Local Group: the impact of turbulent metal diffusion Escala, Ivanna; Wetzel, Andrew; Kirby, Evan N. arXiv https://doi.org/10.48550/arxiv.1710.06533	text	January 2017
The origin of the diverse morphologies and kinematics of Milky Way-mass galaxies in the FIRE-2 simulations Garrison-Kimmel, Shea; Hopkins, Philip F.; Wetzel, Andrew arXiv https://doi.org/10.48550/arxiv.1712.03966	text	January 2017
Halo Substructure in the SDSS-Gaia Catalogue : Streams and Clumps Myeong, G. C.; Evans, N. W.; Belokurov, V. arXiv https://doi.org/10.48550/arxiv.1712.04071	text	January 2017
Apocenter Pile-Up: Origin of the Stellar Halo Density Break Deason, Alis J.; Belokurov, Vasily; Koposov, Sergey E. arXiv https://doi.org/10.48550/arxiv.1805.10288	text	January 2018
The Local Group on FIRE: Dwarf galaxy populations across a suite of hydrodynamic simulations Garrison-Kimmel, Shea; Hopkins, Philip F.; Wetzel, Andrew arXiv https://doi.org/10.48550/arxiv.1806.04143	text	January 2018
A Dark Matter Hurricane: Measuring the S1 Stream with Dark Matter Detectors O'Hare, Ciaran A. J.; McCabe, Christopher; Evans, N. Wyn arXiv https://doi.org/10.48550/arxiv.1807.09004	text	January 2018
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Towards a more rigorous treatment of uncertainties on the velocity distribution of dark matter particles for capture in stars Lopes, José; Lacroix, Thomas; Lopes, Ilídio Journal of Cosmology and Astroparticle Physics, Vol. 2021, Issue 01 https://doi.org/10.1088/1475-7516/2021/01/073	journal	January 2021
Dark matter capture by the Sun: revisiting velocity distribution uncertainties Nuñez-Castiñeyra, A.; Nezri, E.; Bertin, V. arXiv https://doi.org/10.48550/arxiv.1906.11674	text	January 2019
A profile in FIRE: resolving the radial distributions of satellite galaxies in the Local Group with simulations Samuel, Jenna; Wetzel, Andrew; Tollerud, Erik Monthly Notices of the Royal Astronomical Society, Vol. 491, Issue 1 https://doi.org/10.1093/mnras/stz3054	journal	October 2019
Velocity substructure from Gaia and direct searches for dark matter O’Hare, Ciaran A. J.; Evans, N. Wyn; McCabe, Christopher Physical Review D, Vol. 101, Issue 2 https://doi.org/10.1103/physrevd.101.023006	journal	January 2020

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