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The impact of cored density profiles on the observable quantities of dwarf spheroidal galaxies

Harvey, David; Revaz, Yves; Robertson, Andrew; Hausammann, Loic

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Authors

David Harvey

Yves Revaz

Loic Hausammann



Abstract

We modify the chemo-dynamical code GEAR to simulate the impact of self-interacting dark matter (SIDM) on the observable quantities of 19 low-mass dwarf galaxies with a variety star-forming properties. We employ a relatively high, velocity independent cross-section of σ/m=10cm2g−1 and extract, in addition to integrated quantities, the total mass density profile, the luminosity profile, the line-of-sight velocities, the chemical abundance, and the star formation history. We find that despite the creation of large cores at the centre of the dark matter haloes, the impact of SIDM on the observable quantities of quenched galaxies is indiscernible, dominated mostly by the stochastic build up of the stellar matter. As such we conclude that it is impossible to make global statements on the density profile of dwarf galaxies from single or small samples. Although based mostly on quenched galaxies, this finding supports other recent work putting into question the reliability of inferred cored density profiles that are derived from observed line-of-sight velocities.

Citation

Harvey, D., Revaz, Y., Robertson, A., & Hausammann, L. (2018). The impact of cored density profiles on the observable quantities of dwarf spheroidal galaxies. Monthly Notices of the Royal Astronomical Society: Letters, 481(1), L89-L93. https://doi.org/10.1093/mnrasl/sly159

Journal Article Type Article
Acceptance Date Aug 29, 2018
Online Publication Date Sep 4, 2018
Publication Date Sep 4, 2018
Deposit Date Dec 13, 2018
Publicly Available Date Mar 29, 2024
Journal Monthly Notices of the Royal Astronomical Society: Letters
Electronic ISSN 1745-3933
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 481
Issue 1
Pages L89-L93
DOI https://doi.org/10.1093/mnrasl/sly159

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.




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