Under the FIRElight: Stellar Tracers of the Local Dark Matter Velocity Distribution in the Milky Way
Abstract
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.
- Authors:
-
[1];
[1];
[3];
[4];
[1];
[5];
[6]
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- Princeton Univ., NJ (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)
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); Alfred P. Sloan Foundation
- OSTI Identifier:
- 1600644
- Grant/Contract Number:
- SC0007968; SC0011632; PF5-160136; NAS8-03060; 80NSSC18K1097; HST-GO-14734; HST-AR-15057; AST-1517491; AST-1715216; AST-1652522; NNX15AB22G; 17-ATP17-0067; 1715847; 1455342; NNX15AT06G; JPL 1589742; 17-ATP17-0214; AST-1715101; PHY-1607611
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 883; Journal Issue: 1; Journal ID: ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; dark matter; galaxy formation; kinematics and dynamics
Citation Formats
Necib, Lina, Lisanti, Mariangela, Garrison-Kimmel, Shea, Wetzel, Andrew, Sanderson, Robyn, Hopkins, Philip F., Faucher-Giguère, Claude-André, and Kereš, Dušan. Under the FIRElight: Stellar Tracers of the Local Dark Matter Velocity Distribution in the Milky Way. United States: N. p., 2019.
Web. doi:10.3847/1538-4357/ab3afc.
Necib, Lina, Lisanti, Mariangela, Garrison-Kimmel, Shea, Wetzel, Andrew, Sanderson, Robyn, Hopkins, Philip F., Faucher-Giguère, Claude-André, & Kereš, Dušan. Under the FIRElight: Stellar Tracers of the Local Dark Matter Velocity Distribution in the Milky Way. United States. https://doi.org/10.3847/1538-4357/ab3afc
Necib, Lina, Lisanti, Mariangela, Garrison-Kimmel, Shea, Wetzel, Andrew, Sanderson, Robyn, Hopkins, Philip F., Faucher-Giguère, Claude-André, and Kereš, Dušan. Wed .
"Under the FIRElight: Stellar Tracers of the Local Dark Matter Velocity Distribution in the Milky Way". United States. https://doi.org/10.3847/1538-4357/ab3afc. https://www.osti.gov/servlets/purl/1600644.
@article{osti_1600644,
title = {Under the FIRElight: Stellar Tracers of the Local Dark Matter Velocity Distribution in the Milky Way},
author = {Necib, Lina and Lisanti, Mariangela and Garrison-Kimmel, Shea and Wetzel, Andrew and Sanderson, Robyn and Hopkins, Philip F. and Faucher-Giguère, Claude-André and Kereš, Dušan},
abstractNote = {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.},
doi = {10.3847/1538-4357/ab3afc},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 883,
place = {United States},
year = {Wed Sep 18 00:00:00 EDT 2019},
month = {Wed Sep 18 00:00:00 EDT 2019}
}
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Gaia reveals a metal-rich in-situ component of the local stellar halo
text, January 2017
- Bonaca, Ana; Conroy, Charlie; Wetzel, Andrew
- arXiv
The Metal-Poor Stellar Halo in RAVE-TGAS and its Implications for the Velocity Distribution of Dark Matter
text, January 2017
- Herzog-Arbeitman, Jonah; Lisanti, Mariangela; Necib, Lina
- arXiv
Modelling chemical abundance distributions for dwarf galaxies in the Local Group: the impact of turbulent metal diffusion
text, January 2017
- Escala, Ivanna; Wetzel, Andrew; Kirby, Evan N.
- arXiv
The origin of the diverse morphologies and kinematics of Milky Way-mass galaxies in the FIRE-2 simulations
text, January 2017
- Garrison-Kimmel, Shea; Hopkins, Philip F.; Wetzel, Andrew
- arXiv
Halo Substructure in the SDSS-Gaia Catalogue : Streams and Clumps
text, January 2017
- Myeong, G. C.; Evans, N. W.; Belokurov, V.
- arXiv
Apocenter Pile-Up: Origin of the Stellar Halo Density Break
text, January 2018
- Deason, Alis J.; Belokurov, Vasily; Koposov, Sergey E.
- arXiv
The Local Group on FIRE: Dwarf galaxy populations across a suite of hydrodynamic simulations
text, January 2018
- Garrison-Kimmel, Shea; Hopkins, Philip F.; Wetzel, Andrew
- arXiv
A Dark Matter Hurricane: Measuring the S1 Stream with Dark Matter Detectors
text, January 2018
- O'Hare, Ciaran A. J.; McCabe, Christopher; Evans, N. Wyn
- arXiv
The phase-space structure of cold dark-matter halos: Insights into the Galactic halo
text, January 2002
- Helmi, Amina; White, Simon D. M.; Springel, Volker
- arXiv
Chemical Abundance Distributions of Galactic Halos and their Satellite Systems in a Lambda CDM Universe
text, January 2005
- Font, Andreea S.; Johnston, Kathryn V.; Bullock, James S.
- arXiv
Starburst99: Synthesis Models for Galaxies with Active Star Formation
text, January 1999
- Leitherer, Claus; Schaerer, Daniel; Goldader, Jeffrey D.
- arXiv
Works referencing / citing this record:
A profile in FIRE: resolving the radial distributions of satellite galaxies in the Local Group with simulations
journal, October 2019
- Samuel, Jenna; Wetzel, Andrew; Tollerud, Erik
- Monthly Notices of the Royal Astronomical Society, Vol. 491, Issue 1
Towards a more rigorous treatment of uncertainties on the velocity distribution of dark matter particles for capture in stars
journal, January 2021
- Lopes, José; Lacroix, Thomas; Lopes, Ilídio
- Journal of Cosmology and Astroparticle Physics, Vol. 2021, Issue 01
Dark matter capture by the Sun: revisiting velocity distribution uncertainties
text, January 2019
- Nuñez-Castiñeyra, A.; Nezri, E.; Bertin, V.
- arXiv