The M33 globular cluster system with PAndAS data : the last outer halo cluster?

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DOIResolve DOI: http://doi.org/10.1088/0004-637X/730/2/112
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TypeArticle
Journal titleThe Astrophysical Journal
ISSN0004-637X
Volume730
Issue2
Article number112
Pages112-1
Subjectgalaxies: evolution; galaxies: halos; galaxies: individual (M33); galaxies: spiral; galaxies: star clusters: general; Local Group
AbstractWe use CFHT/MegaCam data to search for outer halo star clusters in M33 as part of the Pan-Andromeda Archaeological Survey. This work extends previous studies out to a projected radius of 50 kpc and covers over 40 deg(2). We find only one new unambiguous star cluster in addition to the five previously known in the M33 outer halo (10 kpc <= r <= 50 kpc). Although we identify 2440 cluster candidates of various degrees of confidence from our objective image search procedure, almost all of these are likely background contaminants, mostly faint unresolved galaxies. We measure the luminosity, color, and structural parameters of the new cluster in addition to the five previously known outer halo clusters. At a projected radius of 22 kpc, the new cluster is slightly smaller, fainter, and redder than all but one of the other outer halo clusters, and has g' approximate to 19.9, (g' - i') approximate to 0.6, concentration parameter c approximate to 1.0, a core radius r(c) approximate to 3.5 pc, and a half-light radius r(h) approximate to 5.5 pc. For M33 to have so few outer halo clusters compared to M31 suggests either tidal stripping of M33' s outer halo clusters by M31, or a very different, much calmer accretion history of M33.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Herzberg Institute of Astrophysics
Peer reviewedYes
NPARC number19793789
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Record identifierca7a5dc5-ac7f-4380-b1ca-c3fe9170b239
Record created2012-04-10
Record modified2016-07-18
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