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Title: Galactoseismology and the local density of dark matter

Abstract

Here, we model vertical breathing mode perturbations in the Milky Way's stellar disc and study their effects on estimates of the local dark matter density, surface density, and vertical force. Evidence for these perturbations, which involve compression and expansion of the Galactic disc perpendicular to its midplane, come from the SEGUE, RAVE, and LAMOST surveys. We show that their existence may lead to systematic errors of $$10\%$$ or greater in the vertical force $$K_z(z)$$ at $$|z|=1.1\,{\rm kpc}$$. These errors translate to $$\gtrsim 25\%$$ errors in estimates of the local dark matter density. Using different mono-abundant subpopulations as tracers offers a way out: if the inferences from all tracers in the Gaia era agree, then the dark matter determination will be robust. Disagreement in the inferences from different tracers will signal the breakdown of the unperturbed model and perhaps provide the means for determining the nature of the perturbation.

Authors:
 [1];  [2];  [3]
  1. Univ. of Florida, Gainesville, FL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  2. Queen's Univ., Kingston, ON (Canada)
  3. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1331120
Report Number(s):
FERMILAB-PUB-16-315-A-AE-PPD-T; arXiv:1608.03338
Journal ID: ISSN 0035-8711; 1480936
Grant/Contract Number:  
AC02-07CH11359
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 464; Journal Issue: 4; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; solar neighborhood; galaxies: kinematics and dynamics; galaxies: structure; dark matter

Citation Formats

Banik, Nilanjan, Widrow, Lawrence M., and Dodelson, Scott. Galactoseismology and the local density of dark matter. United States: N. p., 2016. Web. doi:10.1093/mnras/stw2603.
Banik, Nilanjan, Widrow, Lawrence M., & Dodelson, Scott. Galactoseismology and the local density of dark matter. United States. doi:10.1093/mnras/stw2603.
Banik, Nilanjan, Widrow, Lawrence M., and Dodelson, Scott. Sat . "Galactoseismology and the local density of dark matter". United States. doi:10.1093/mnras/stw2603. https://www.osti.gov/servlets/purl/1331120.
@article{osti_1331120,
title = {Galactoseismology and the local density of dark matter},
author = {Banik, Nilanjan and Widrow, Lawrence M. and Dodelson, Scott},
abstractNote = {Here, we model vertical breathing mode perturbations in the Milky Way's stellar disc and study their effects on estimates of the local dark matter density, surface density, and vertical force. Evidence for these perturbations, which involve compression and expansion of the Galactic disc perpendicular to its midplane, come from the SEGUE, RAVE, and LAMOST surveys. We show that their existence may lead to systematic errors of $10\%$ or greater in the vertical force $K_z(z)$ at $|z|=1.1\,{\rm kpc}$. These errors translate to $\gtrsim 25\%$ errors in estimates of the local dark matter density. Using different mono-abundant subpopulations as tracers offers a way out: if the inferences from all tracers in the Gaia era agree, then the dark matter determination will be robust. Disagreement in the inferences from different tracers will signal the breakdown of the unperturbed model and perhaps provide the means for determining the nature of the perturbation.},
doi = {10.1093/mnras/stw2603},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 464,
place = {United States},
year = {2016},
month = {10}
}

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Cited by: 5 works
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    Works referencing / citing this record:

    3D Asymmetrical motions of the Galactic outer disc with LAMOST K giant stars
    journal, March 2018

    • Wang, Haifeng; López-Corredoira, Martín; Carlin, Jeffrey L.
    • Monthly Notices of the Royal Astronomical Society, Vol. 477, Issue 3
    • DOI: 10.1093/mnras/sty739

    3D Asymmetrical motions of the Galactic outer disc with LAMOST K giant stars
    journal, March 2018

    • Wang, Haifeng; López-Corredoira, Martín; Carlin, Jeffrey L.
    • Monthly Notices of the Royal Astronomical Society, Vol. 477, Issue 3
    • DOI: 10.1093/mnras/sty739