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:
-
- Univ. of Florida, Gainesville, FL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Queen's Univ., Kingston, ON (Canada)
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- 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. https://doi.org/10.1093/mnras/stw2603
Banik, Nilanjan, Widrow, Lawrence M., and Dodelson, Scott. Sat .
"Galactoseismology and the local density of dark matter". United States. https://doi.org/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 = {Sat Oct 08 00:00:00 EDT 2016},
month = {Sat Oct 08 00:00:00 EDT 2016}
}
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Works referencing / citing this record:
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