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An Ultra-faint Galaxy Candidate Discovered in Early Data from the Magellanic Satellites Survey

Noel, N (2016) An Ultra-faint Galaxy Candidate Discovered in Early Data from the Magellanic Satellites Survey The Astrophysical Journal: an international review of astronomy and astronomical physics, 833 (L5).

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Abstract

We report a new ultra-faint stellar system found in Dark Energy Camera data from the first observing run of the Magellanic Satellites Survey (MagLiteS). MagLiteS J0644−5953 (Pictor II or Pic II) is a low surface brightness (N 28.5 mag arcsec 1 1 2 within its half-light radius) resolved overdensity of old and metal-poor stars located at a heliocentric distance of 45 kpc 4 5 . The physical size ( r1 2 46 pc 11 15 ) and low luminosity ( M V 3.2 mag 0.5 0.4 ) of this satellite are consistent with the locus of spectroscopically confirmed ultra-faint galaxies. MagLiteS J0644−5953 (Pic II) is located 11.3 kpc 0.9 3.1 from the Large Magellanic Cloud (LMC), and comparisons with simulation results in the literature suggest that this satellite was likely accreted with the LMC. The close proximity of MagLiteS J0644−5953 (Pic II) to the LMC also makes it the most likely ultra-faint galaxy candidate to still be gravitationally bound to the LMC.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
AuthorsEmailORCID
Noel, NUNSPECIFIEDUNSPECIFIED
Date : 1 December 2016
Identification Number : https://doi.org/10.3847/2041-8205/833/1/L5
Copyright Disclaimer : Copyright 2016 The American Astronomical Society
Depositing User : Symplectic Elements
Date Deposited : 04 Apr 2017 17:21
Last Modified : 04 Apr 2017 17:21
URI: http://epubs.surrey.ac.uk/id/eprint/813863

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