University of Surrey

Test tubes in the lab Research in the ATI Dance Research

SMASH 1: A Very Faint Globular Cluster Disrupting in the Outer Reaches of the LMC?

Noel, N (2016) SMASH 1: A Very Faint Globular Cluster Disrupting in the Outer Reaches of the LMC? Letters of the Astrophysical Journal, 830 (L10).

[img]
Preview
Text
Noel_SMASH_I.pdf - Accepted version Manuscript
Available under License : See the attached licence file.

Download (531kB) | Preview
[img]
Preview
Text (licence)
SRI_deposit_agreement.pdf
Available under License : See the attached licence file.

Download (33kB) | Preview

Abstract

We present the discovery of a very faint stellar system, SMASH 1, that is potentially a satellite of the Large Magellanic Cloud. Found within the Survey of the MAgellanic Stellar History (SMASH), SMASH 1 is a compact ( rh 9.1 pc 3.4 5.9 ) and very low luminosity (MV o 1.0 0.9, o LV 10 L: 2.3 0.4 ) stellar system that is revealed by its sparsely populated main sequence and a handful of red giant branch candidate member stars. The photometric properties of these stars are compatible with a metal-poor ([Fe H 2.2 ] ) and old (13 Gyr) isochrone located at a distance modulus of ∼18.8, i.e., a distance of _57 kpc. Situated at 11°. 3 from the LMC in projection, its three-dimensional distance from the Cloud is _13 kpc, consistent with a connection to the LMC, whose tidal radius is at least 16 kpc. Although the nature of SMASH 1 remains uncertain, its compactness favors it being a stellar cluster and hence dark-matter free. If this is the case, its dynamical tidal radius is only 119 pc at this distance from the LMC, and smaller than the system’s extent on the sky. Its low luminosity and apparent high ellipticity (� 0.62 0.21 0.17) with its major axis pointing toward the LMC may well be the tell-tale sign of its imminent tidal demise.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Noel, NUNSPECIFIEDUNSPECIFIED
Date : 1 October 2016
Identification Number : https://doi.org/10.3847/2041-8205/830/1/L10
Copyright Disclaimer : Copyright 2016 The American Astronomical Society
Depositing User : Symplectic Elements
Date Deposited : 04 Apr 2017 17:32
Last Modified : 04 Apr 2017 17:32
URI: http://epubs.surrey.ac.uk/id/eprint/813864

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