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dc.contributor.authorLuque Canaza, Elmer Fidelpt_BR
dc.contributor.authorSantiago, Basilio Xavierpt_BR
dc.contributor.authorPieres, Adrianopt_BR
dc.contributor.authorQueiroz, Anna Bárbara de Andradept_BR
dc.contributor.authorDal Ponte, Marinapt_BR
dc.contributor.authorThomas, D.pt_BR
dc.date.accessioned2018-09-28T02:35:01Zpt_BR
dc.date.issued2018pt_BR
dc.identifier.issn0035-8711pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/182920pt_BR
dc.description.abstractWe report the discovery of a new star cluster, DES 3, in the constellation of Indus, and deeper observations of the previously identified satellite DES J0222.7−5217 (Eridanus III). DES 3 was detected as a stellar overdensity in first-year Dark Energy Survey data, and confirmed with deeper photometry from the 4.1-m Southern Astrophysical Research (SOAR) telescope. The new system was detected with a relatively high significance and appears in the DES images as a compact concentration of faint blue point sources. We determine that DES 3 is located at a heliocentric distance of 76.2 kpc and it is dominated by an old ( 9.8Gyr) and metal-poor ([Fe/H] −1.84) population. While the age and metallicity values of DES 3 are comparable to typical globular clusters (objects with a high stellar density, stellar mass of ∼105 M and luminosity MV ∼ −7.3), its half-light radius (rh ∼ 6.87 pc) and luminosity (MV ∼ −1.7) are more indicative of faint star cluster. Based on the angular size, DES 3, with a value of rh ∼ 0. 31, is among the smallest faint star clusters known to date. Furthermore, using deeper imaging of DES J0222.7−5217 taken with the SOAR telescope, we update structural parameters and perform the first isochrone modelling. Our analysis yields the first age ( 12.6Gyr) and metallicity ([Fe/H] −2.01) estimates for this object. The half-light radius (rh 11.24 pc) and luminosity (MV −2.4) of DES J0222.7−5217 suggest that it is likely a faint star cluster. The discovery of DES 3 indicates that the census of stellar systems in the MilkyWay is still far from complete, and demonstrates the power of modern wide-field imaging surveys to improve our knowledge of the Galaxy’s satellite population.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofMonthly notices of the royal astronomical society. Oxford. Vol. 478, no. 2 (Aug. 2018), p. 2006-2018pt_BR
dc.rightsOpen Accessen
dc.subjectAglomerados globularespt_BR
dc.subjectGlobular clusters: generalen
dc.subjectFotometria astronômicapt_BR
dc.subjectGalaxy: haloen
dc.subjectHalospt_BR
dc.titleDeep SOAR follow-up photometry of two Milky Way outer-halo companions discovered with Dark Energy Surveypt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001074997pt_BR
dc.type.originEstrangeiropt_BR


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