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dc.contributor.authorBalbinot, Eduardopt_BR
dc.contributor.authorSantiago, Basilio Xavierpt_BR
dc.contributor.authorCosta, Luiz N. dapt_BR
dc.contributor.authorMaia, Marcio Antonio Geimbapt_BR
dc.contributor.authorMajewski, Steven Raymondpt_BR
dc.contributor.authorNidever, D.L.pt_BR
dc.contributor.authorRocha-Pinto, H.J.pt_BR
dc.contributor.authorThomas, D.pt_BR
dc.contributor.authorWechsler, Risa H.pt_BR
dc.contributor.authorYanny, Brianpt_BR
dc.date.accessioned2015-01-20T02:15:20Zpt_BR
dc.date.issued2013pt_BR
dc.identifier.issn0004-637Xpt_BR
dc.identifier.urihttp://hdl.handle.net/10183/109064pt_BR
dc.description.abstractWe report on the discovery of a new Milky Way (MW) companion stellar system located at (αJ 2000, δJ 2000) = (22h10 m 43 s. 15,14º56'58".8). The discovery was made using the eighth data release of SDSS after applying an automated method to search for overdensities in the Baryon Oscillation Spectroscopic Survey footprint. Follow-up observations were performed using Canada–France–Hawaii-Telescope/MegaCam, which reveal that this system is comprised of an old stellar population, located at a distance of 31.9+1.0 −1.6 kpc, with a half-light radius of rh = 7.24+1.94 −1.29 pc and a concentration parameter of c = log10(rt/rc) = 1.55. A systematic isochrone fit to its color–magnitude diagram resulted in log (age yr-ˡ) = 10.07+0.05 −0.03 and [Fe/H] = −1.58+0.08 −0.13. These quantities are typical of globular clusters in the MW halo. The newly found object is of low stellar mass, whose observed excess relative to the background is caused by 95 ± 6 stars. The direct integration of its background decontaminated luminosity function leads to an absolute magnitude of MV = −1.21 ± 0.66. The resulting surface brightness is μV = 25.90 mag arcsec-². Its position in the MV versus rh diagram lies close to AM4 and Koposov 1, which are identified as star clusters. The object is most likely a very faint star cluster—one of the faintest and lowest mass systems yet identified.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofThe astrophysical journal. Bristol. Vol. 767, no. 2 (Apr. 2013), 101, 6 p.pt_BR
dc.rightsOpen Accessen
dc.subjectAglomerados estelares globularespt_BR
dc.subjectGalaxies: dwarfen
dc.subjectGalaxiapt_BR
dc.subjectGlobular clusters: generalen
dc.subjectMassa estelarpt_BR
dc.subjectLocal groupen
dc.subjectEspectros estelarespt_BR
dc.titleA new Milk Way halo star cluster in the southern galactic skypt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000900517pt_BR
dc.type.originEstrangeiropt_BR


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