The metal-poor stellar halo in RAVE-TGAS and its implications for the velocity distribution of dark matter
Abstract
The local velocity distribution of dark matter plays an integral role in interpreting the results from direct detection experiments. We previously showed that metal-poor halo stars serve as excellent tracers of the virialized dark matter velocity distribution using a high-resolution hydrodynamic simulation of a Milky Way-like halo. In this paper, we take advantage of the first Gaia data release, coupled with spectroscopic measurements from the RAdial Velocity Experiment (RAVE), to study the kinematics of stars belonging to the metal-poor halo within an average distance of ~5 kpc of the Sun. We study stars with iron abundances [Fe/H] < -1.5 and -1.8 that are located more than 1.5 kpc from the Galactic plane. Using a Gaussian mixture model analysis, we identify the stars that belong to the halo population, as well as some kinematic outliers. Here we find that both metallicity samples have similar velocity distributions for the halo component, within uncertainties. Assuming that the stellar halo velocities adequately trace the virialized dark matter, we study the implications for direct detection experiments. The Standard Halo Model, which is typically assumed for dark matter, is discrepant with the empirical distribution by ~6σ, predicts fewer high-speed particles, and is anisotropic. As a result,more »
- Authors:
-
- Princeton University, NJ (United States)
- Massachusetts Institute of Technology (MIT), Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); Alfred P. Sloan Foundation; Cottrell Scholar Program
- OSTI Identifier:
- 1540498
- Grant/Contract Number:
- SC0007968; SC00012567
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Cosmology and Astroparticle Physics
- Additional Journal Information:
- Journal Volume: 2018; Journal Issue: 04; Journal ID: ISSN 1475-7516
- Publisher:
- Institute of Physics (IOP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTRONOMY AND ASTROPHYSICS; dark matter experiments; dark matter theory; galaxy dynamics; stars
Citation Formats
Herzog-Arbeitman, Jonah, Lisanti, Mariangela, and Necib, Lina. The metal-poor stellar halo in RAVE-TGAS and its implications for the velocity distribution of dark matter. United States: N. p., 2018.
Web. doi:10.1088/1475-7516/2018/04/052.
Herzog-Arbeitman, Jonah, Lisanti, Mariangela, & Necib, Lina. The metal-poor stellar halo in RAVE-TGAS and its implications for the velocity distribution of dark matter. United States. https://doi.org/10.1088/1475-7516/2018/04/052
Herzog-Arbeitman, Jonah, Lisanti, Mariangela, and Necib, Lina. Fri .
"The metal-poor stellar halo in RAVE-TGAS and its implications for the velocity distribution of dark matter". United States. https://doi.org/10.1088/1475-7516/2018/04/052. https://www.osti.gov/servlets/purl/1540498.
@article{osti_1540498,
title = {The metal-poor stellar halo in RAVE-TGAS and its implications for the velocity distribution of dark matter},
author = {Herzog-Arbeitman, Jonah and Lisanti, Mariangela and Necib, Lina},
abstractNote = {The local velocity distribution of dark matter plays an integral role in interpreting the results from direct detection experiments. We previously showed that metal-poor halo stars serve as excellent tracers of the virialized dark matter velocity distribution using a high-resolution hydrodynamic simulation of a Milky Way-like halo. In this paper, we take advantage of the first Gaia data release, coupled with spectroscopic measurements from the RAdial Velocity Experiment (RAVE), to study the kinematics of stars belonging to the metal-poor halo within an average distance of ~5 kpc of the Sun. We study stars with iron abundances [Fe/H] < -1.5 and -1.8 that are located more than 1.5 kpc from the Galactic plane. Using a Gaussian mixture model analysis, we identify the stars that belong to the halo population, as well as some kinematic outliers. Here we find that both metallicity samples have similar velocity distributions for the halo component, within uncertainties. Assuming that the stellar halo velocities adequately trace the virialized dark matter, we study the implications for direct detection experiments. The Standard Halo Model, which is typically assumed for dark matter, is discrepant with the empirical distribution by ~6σ, predicts fewer high-speed particles, and is anisotropic. As a result, the Standard Halo Model overpredicts the nuclear scattering rate for dark matter masses below ~10 GeV. The kinematic outliers that we identify may potentially be correlated with dark matter substructure, though further study is needed to establish this correspondence.},
doi = {10.1088/1475-7516/2018/04/052},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 04,
volume = 2018,
place = {United States},
year = {Fri Apr 20 00:00:00 EDT 2018},
month = {Fri Apr 20 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
Dark Matter Energy Deposition and Production from the Table-Top to the Cosmos
preprint, January 2019
- Liu, Hongwan
- arXiv