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Structural Parameters of Seven Small Magellanic Cloud Intermediate-Age and Old Star Clusters

Glatt, Katharina; Grebel, E K; Gallagher, John S; Nota, Antonella; Sabbi, Elena; Sirianni, Marco; Clementini, G; Da Costa, Gary; Tosi, Monica; Harbeck, Daniel; Koch, Andreas; Kayser, Adrea

Description

We present structural parameters for the seven intermediate-age and old star clusters NGC121, Lindsay1, Kron3, NGC339, NGC416, Lindsay38, and NGC419 in the Small Magellanic Cloud (SMC). We fit King profiles and Elson, Fall, and Freeman profiles to both surface-brightness and star-count data taken with the Advanced Camera for Surveys aboard the Hubble Space Telescope. Clusters older than ∼ 1Gyr show a spread in cluster core radii that increases with age, while the youngest clusters have...[Show more]

dc.contributor.authorGlatt, Katharina
dc.contributor.authorGrebel, E K
dc.contributor.authorGallagher, John S
dc.contributor.authorNota, Antonella
dc.contributor.authorSabbi, Elena
dc.contributor.authorSirianni, Marco
dc.contributor.authorClementini, G
dc.contributor.authorDa Costa, Gary
dc.contributor.authorTosi, Monica
dc.contributor.authorHarbeck, Daniel
dc.contributor.authorKoch, Andreas
dc.contributor.authorKayser, Adrea
dc.date.accessioned2015-12-07T22:32:34Z
dc.identifier.issn0004-6256
dc.identifier.urihttp://hdl.handle.net/1885/22873
dc.description.abstractWe present structural parameters for the seven intermediate-age and old star clusters NGC121, Lindsay1, Kron3, NGC339, NGC416, Lindsay38, and NGC419 in the Small Magellanic Cloud (SMC). We fit King profiles and Elson, Fall, and Freeman profiles to both surface-brightness and star-count data taken with the Advanced Camera for Surveys aboard the Hubble Space Telescope. Clusters older than ∼ 1Gyr show a spread in cluster core radii that increases with age, while the youngest clusters have relatively compact cores. No evidence for post-core-collapse clusters was found. We find no correlation between core radius and distance from the SMC center, although consistent with other studies of dwarf galaxies, some relatively old and massive clusters have low densities. The oldest SMC star cluster, the only globular NGC121, is the most elliptical object of the studied clusters. No correlation is seen between ellipticity and distance from the SMC center. The structures of these massive intermediate-age (1-8 Gyr) SMC star clusters thus appear to primarily result from internal evolutionary processes.
dc.publisherUniversity of Chicago Press
dc.sourceAstronomical Journal
dc.subjectKeywords: Galaxies; Star clusters Magellanic Clouds
dc.titleStructural Parameters of Seven Small Magellanic Cloud Intermediate-Age and Old Star Clusters
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume138
dc.date.issued2009
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationu3356449xPUB24
local.type.statusPublished Version
local.contributor.affiliationGlatt, Katharina , University of Basel
local.contributor.affiliationGrebel, E K, Universitat Basel
local.contributor.affiliationGallagher, John S, University of Wisconsin
local.contributor.affiliationNota, Antonella, Space Telescope Science Institute
local.contributor.affiliationSabbi, Elena, Space Telescope Science Institute
local.contributor.affiliationSirianni, Marco, Space Telescope Science Institute
local.contributor.affiliationClementini, G, INAF, Osservatorio Astronomico di Bologna
local.contributor.affiliationDa Costa, Gary, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationTosi, Monica, INAF - Osservatorio Astronomico di Bologna
local.contributor.affiliationHarbeck, Daniel, University of Wisconsin
local.contributor.affiliationKoch, Andreas, University of Leicester
local.contributor.affiliationKayser, Adrea, University of Basel
local.description.embargo2037-12-31
local.bibliographicCitation.issue5
local.bibliographicCitation.startpage1403
local.bibliographicCitation.lastpage1416
local.identifier.doi10.1088/0004-6256/138/5/1403
dc.date.updated2016-02-24T09:54:47Z
local.identifier.scopusID2-s2.0-70350589087
local.identifier.thomsonID000270852100015
CollectionsANU Research Publications

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