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

Drlica-Wagner, A., Bechtol, K., Allam, S., Tucker, D.L., Gruendl, R.A., Johnson, M.D., Walker, A.R., James, D.J., Nidever, D.L., Olsen, K.A.G. , Wechsler, R.H., Cioni, M.R.L., Conn, B.C., Kuehn, K., Li, T.S., Mao, Y.-Y., Martin, N.F., Neilsen, E., Noel, Noelia, Pieres, A., Simon, J.D., Stringfellow, G.S., van der Marel, R.P. and Yanny, B. (2016) An Ultra-faint Galaxy Candidate Discovered in Early Data from the Magellanic Satellites Survey The Astrophysical Journal, 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 :
NameEmailORCID
Drlica-Wagner, A.UNSPECIFIEDUNSPECIFIED
Bechtol, K.UNSPECIFIEDUNSPECIFIED
Allam, S.UNSPECIFIEDUNSPECIFIED
Tucker, D.L.UNSPECIFIEDUNSPECIFIED
Gruendl, R.A.UNSPECIFIEDUNSPECIFIED
Johnson, M.D.UNSPECIFIEDUNSPECIFIED
Walker, A.R.UNSPECIFIEDUNSPECIFIED
James, D.J.UNSPECIFIEDUNSPECIFIED
Nidever, D.L.UNSPECIFIEDUNSPECIFIED
Olsen, K.A.G.UNSPECIFIEDUNSPECIFIED
Wechsler, R.H.UNSPECIFIEDUNSPECIFIED
Cioni, M.R.L.UNSPECIFIEDUNSPECIFIED
Conn, B.C.UNSPECIFIEDUNSPECIFIED
Kuehn, K.UNSPECIFIEDUNSPECIFIED
Li, T.S.UNSPECIFIEDUNSPECIFIED
Mao, Y.-Y.UNSPECIFIEDUNSPECIFIED
Martin, N.F.UNSPECIFIEDUNSPECIFIED
Neilsen, E.UNSPECIFIEDUNSPECIFIED
Noel, Noelian.noel@surrey.ac.ukUNSPECIFIED
Pieres, A.UNSPECIFIEDUNSPECIFIED
Simon, J.D.UNSPECIFIEDUNSPECIFIED
Stringfellow, G.S.UNSPECIFIEDUNSPECIFIED
van der Marel, R.P.UNSPECIFIEDUNSPECIFIED
Yanny, B.UNSPECIFIEDUNSPECIFIED
Date : 30 November 2016
Identification Number : 10.3847/2041-8205/833/1/L5
Copyright Disclaimer : © 2016. The American Astronomical Society. All rights reserved.
Uncontrolled Keywords : Galaxies: dwarf. Local Group. Magellanic Clouds.
Depositing User : Symplectic Elements
Date Deposited : 04 Apr 2017 17:21
Last Modified : 17 Nov 2017 12:58
URI: http://epubs.surrey.ac.uk/id/eprint/813863

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