Galactoseismology and the local density of dark matter

Banik, Nilanjan; Widrow, Lawrence M.; Dodelson, Scott

doi:10.1093/mnras/stw2603

Title: Galactoseismology and the local density of dark matter

Journal Article · Sat Oct 08 00:00:00 EDT 2016 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stw2603· OSTI ID:1331120

Banik, Nilanjan ^[1]; Widrow, Lawrence M. ^[2]; Dodelson, Scott ^[3]

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)

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.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1331120

Report Number(s):: FERMILAB-PUB-16-315-A-AE-PPD-T; arXiv:1608.03338; 1480936

Journal Information:: Monthly Notices of the Royal Astronomical Society, Vol. 464, Issue 4; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 32 works

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The localdark matter density from SDSS-SEGUE G-dwarfs Sivertsson, S.; Silverwood, H.; Read, J. I. Monthly Notices of the Royal Astronomical Society, Vol. 478, Issue 2 https://doi.org/10.1093/mnras/sty977	journal	April 2018
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