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

Par Conseil national de recherches du Canada

DOI	Trouver le DOI : https://doi.org/10.1088/0004-637X/730/2/112
Auteur	Rechercher : Cockcroft, Robert; Rechercher : Harris, William E.; Rechercher : Ferguson, Annette M. N.; Rechercher : Huxor, Avon; Rechercher : Ibata, Rodrigo; Rechercher : Irwin, Mike J.; Rechercher : McConnachie, Alan W.¹; Rechercher : Woodley, Kristin A.; Rechercher : Chapman, Scott C.; Rechercher : Lewis, Geraint F.; Rechercher : Puzia, Thomas H.
Affiliation	Conseil national de recherches du Canada. Institut Herzberg d'astrophysique du CNRC
Format	Texte, Article
Sujet	galaxies: evolution; galaxies: halos; galaxies: individual (M33); galaxies: spiral; galaxies: star clusters: general; local group
Résumé	We 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.
Date de publication	2011-03-10
Maison d’édition	American Astronomical Society IOP Publishing
Dans	The Astrophysical Journal 730, nº 2, 112.
Langue	anglais
Publications évaluées par des pairs	Oui
Numéro NPARC	19793789
Exporter la notice	Exporter en format RIS
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Identificateur de l’enregistrement	ca7a5dc5-ac7f-4380-b1ca-c3fe9170b239
Enregistrement créé	2012-04-10
Enregistrement modifié	2020-04-21

Date de modification :: 2024-06-30