University of Surrey

Test tubes in the lab Research in the ATI Dance Research

A low pre-infall mass for the Carina dwarf galaxy from disequilibrium modelling.

Ural, U, Wilkinson, MI, Read, JI and Walker, MG (2015) A low pre-infall mass for the Carina dwarf galaxy from disequilibrium modelling. Nat Commun, 6. p. 7599.

[img]
Preview
Text
A low pre-infall mass for the Carina dwarf galaxy from disequilibrium modelling..pdf - Version of Record
Available under License : See the attached licence file.

Download (430kB) | Preview
[img]
Preview
PDF (licence)
SRI_deposit_agreement.pdf
Available under License : See the attached licence file.

Download (33kB) | Preview

Abstract

Dark matter-only simulations of galaxy formation predict many more subhalos around a Milky Way-like galaxy than the number of observed satellites. Proposed solutions require the satellites to inhabit dark matter halos with masses 10(9)-10(10 )Msun at the time they fell into the Milky Way. Here we use a modelling approach, independent of cosmological simulations, to obtain a pre-infall mass of 3.6(-2.3)(+3.8) × 10(8) Msun for one of the Milky Way's satellites: Carina. This determination of a low halo mass for Carina can be accommodated within the standard model only if galaxy formation becomes stochastic in halos below ∼10(10 )Msun. Otherwise Carina, the eighth most luminous Milky Way dwarf, would be expected to inhabit a significantly more massive halo. The implication of this is that a population of 'dark dwarfs' should orbit the Milky Way: halos devoid of stars and yet more massive than many of their visible counterparts.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Ural, UUNSPECIFIEDUNSPECIFIED
Wilkinson, MIUNSPECIFIEDUNSPECIFIED
Read, JIUNSPECIFIEDUNSPECIFIED
Walker, MGUNSPECIFIEDUNSPECIFIED
Date : 2015
Identification Number : 10.1038/ncomms8599
Copyright Disclaimer : This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 29 Jul 2016 16:18
Last Modified : 29 Jul 2016 16:18
URI: http://epubs.surrey.ac.uk/id/eprint/811280

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800