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A 500 parsec halo surrounding the galactic globular NGC 1851

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dc.contributor.author Olszewski, E. W
dc.contributor.author Saha, A
dc.contributor.author Knezek, P
dc.contributor.author Subramaniam, A
dc.contributor.author de Boer, T
dc.contributor.author Seitzer, P
dc.date.accessioned 2009-12-01T16:25:39Z
dc.date.available 2009-12-01T16:25:39Z
dc.date.issued 2009-12
dc.identifier.citation The Astronomical Journal, Vol. 138, No. 6, pp. 1570 - 1576 en
dc.identifier.issn 0004-6256
dc.identifier.uri http://hdl.handle.net/2248/4921
dc.description Open Access
dc.description.abstract Using imaging that shows 4 mag of main-sequence stars, we have discovered that the Galactic globular cluster NGC 1851 is surrounded by a halo that is visible from the tidal radius of 700 arcsec (41 pc) to more than 4500 arcsec (> 250 pc). This halo is symmetric and falls in density as a power law of r(-1.24). It contains approximately 0.1% of the dynamical mass of NGC 1851. There is no evidence for tidal tails. Current models of globular cluster evolution do not explain this feature, although simulations of tidal influences on dwarf spheroidal galaxies qualitatively mimic these results. Given the state of published models, it is not possible to decide between creation of this halo from either isolated cluster evaporation or from tidal or disk shocking, or from destruction of a dwarf galaxy in which this object may have once been embedded. en
dc.language.iso en en
dc.publisher American Astronomical Society en
dc.relation.uri http://dx.doi.org/10.1088/0004-6256/138/6/1570 en
dc.rights © American Astronomical Society en
dc.subject Globular Clusters en
dc.subject Individual: NGC 1851 en
dc.subject Hertzsprung-Russell (HR) Diagram en
dc.title A 500 parsec halo surrounding the galactic globular NGC 1851 en
dc.type Article en

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