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Title: Too big to fail in light of Gaia

Abstract

ABSTRACT We point out an anticorrelation between the central dark matter (DM) densities of the bright Milky Way dwarf spheroidal galaxies (dSphs) and their orbital pericenter distances inferred from Gaia data. The dSphs that have not come close to the Milky Way centre (like Fornax, Carina and Sextans) are less dense in DM than those that have come closer (like Draco and Ursa Minor). The same anticorrelation cannot be inferred for the ultrafaint dSphs due to large scatter, while a trend that dSphs with more extended stellar distributions tend to have lower DM densities emerges with ultrafaints. We discuss how these inferences constrain proposed solutions to the Milky Way’s too-big-to-fail problem and provide new clues to decipher the nature of DM.

Authors:
 [1]; ORCiD logo [1];  [2]
  1. Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
  2. Department of Physics and Astronomy, University of California, Riverside, CA 92521, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1569296
Grant/Contract Number:  
de-sc0008541
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 490 Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Kaplinghat, Manoj, Valli, Mauro, and Yu, Hai-Bo. Too big to fail in light of Gaia. United Kingdom: N. p., 2019. Web. doi:10.1093/mnras/stz2511.
Kaplinghat, Manoj, Valli, Mauro, & Yu, Hai-Bo. Too big to fail in light of Gaia. United Kingdom. doi:10.1093/mnras/stz2511.
Kaplinghat, Manoj, Valli, Mauro, and Yu, Hai-Bo. Tue . "Too big to fail in light of Gaia". United Kingdom. doi:10.1093/mnras/stz2511.
@article{osti_1569296,
title = {Too big to fail in light of Gaia},
author = {Kaplinghat, Manoj and Valli, Mauro and Yu, Hai-Bo},
abstractNote = {ABSTRACT We point out an anticorrelation between the central dark matter (DM) densities of the bright Milky Way dwarf spheroidal galaxies (dSphs) and their orbital pericenter distances inferred from Gaia data. The dSphs that have not come close to the Milky Way centre (like Fornax, Carina and Sextans) are less dense in DM than those that have come closer (like Draco and Ursa Minor). The same anticorrelation cannot be inferred for the ultrafaint dSphs due to large scatter, while a trend that dSphs with more extended stellar distributions tend to have lower DM densities emerges with ultrafaints. We discuss how these inferences constrain proposed solutions to the Milky Way’s too-big-to-fail problem and provide new clues to decipher the nature of DM.},
doi = {10.1093/mnras/stz2511},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 490,
place = {United Kingdom},
year = {2019},
month = {9}
}

Journal Article:
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This content will become publicly available on September 10, 2020
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