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research article

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

Harvey, David  
•
Revaz, Yves  
•
Robertson, Andrew
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November 1, 2018
Monthly Notices Of The Royal Astronomical Society

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 sigma/m =10cm(2) g(-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.

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Type
research article
DOI
10.1093/mnrasl/sly159
Web of Science ID

WOS:000451569100019

Author(s)
Harvey, David  
•
Revaz, Yves  
•
Robertson, Andrew
•
Hausammann, Loic  
Date Issued

2018-11-01

Publisher

OXFORD UNIV PRESS

Published in
Monthly Notices Of The Royal Astronomical Society
Volume

481

Issue

1

Start page

L89

End page

L93

Subjects

Astronomy & Astrophysics

•

Astronomy & Astrophysics

•

galaxies: dwarf

•

galaxies: evolution

•

local group

•

dark matter

•

interacting dark-matter

•

cosmological simulations

•

cold

•

cdm

•

milky

•

sidm

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASTRO  
Available on Infoscience
December 13, 2018
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/152878
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