Confirmation of a New Metal-poor Globular Cluster in the Galactic Bulge

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dc.contributor.authorMinniti, Dante
dc.contributor.authorSchlafly E.F.
dc.contributor.authorPalma, Tali
dc.contributor.authorClariá, Juan J.
dc.contributor.authorHempel, Maren
dc.contributor.authorAlonso-García, Javier
dc.contributor.authorBica, Eduardo
dc.contributor.authorBonatto, Charles
dc.contributor.authorBraga, Vittorio F.
dc.contributor.authorClementini, Gisella
dc.contributor.authorGarofalo, Alessia
dc.contributor.authorGómez, Matías
dc.contributor.authorIvanov, Valentin D.
dc.contributor.authorLucas, Phillip W.
dc.contributor.authorPullen, Joyce
dc.contributor.authorSaito, Roberto K.
dc.contributor.authorSmith, Leigh C.
dc.date.accessioned2022-07-04T22:52:49Z
dc.date.available2022-07-04T22:52:49Z
dc.date.issued2018-10
dc.descriptionIndexación Scopuses
dc.description.abstractWe use deep near-IR photometry of the VISTA Variables in the V'a L'ctea (VVV) Survey and deep DECam Plane Survey (DECaPS) optical photometry to confirm the physical reality of the candidate globular cluster (GC) Minni 22, which is located in the Galactic bulge. This object, which was detected as a high density region in our maps of bulge red giants, is now confirmed as a real GC based on the optical and near-IR color'magnitude diagrams. We also recover three known fundamental mode (ab type) RR Lyrae stars within 2 arcmin of the cluster center. The presence of RR Lyrae stars also seems to confirm Minni 22 as a bonafide old and metal-poor GC. We estimate a cluster reddening E(J - Ks) = 0.6 mag and determine its heliocentric distance D = 7.4 ± 0.3 kpc. The optical and near-IR color'magnitude diagrams reveal well-defined red giant branches in all cases, including a red giant branch bump at Ks = 13.30 ± 0.05 mag. The comparison with theoretical isochrones yields a mean metallicity of [Fe/H] = -1.3 ± 0.3 dex, and age of t ∼ 11.2 Gyr. This is a good example of a new low-luminosity (MV = -6.2 mag) GC found in the central bulge of the Milky Way. After discussing the different ways to confirm the existence of bulge GC candidates, we find that one of the best methods is to use the CMDs from the combination of the DECaPS + VVV photometries. © 2018 The American Astronomical Society. All rights reserved.es
dc.description.urihttps://iopscience-iop-org.recursosbiblioteca.unab.cl/article/10.3847/1538-4357/aadd06
dc.identifier.citationAstrophysical Journal Volume 866, Issue 110 October 2018 Article number 12es
dc.identifier.doi10.3847/1538-4357/aadd06
dc.identifier.issn0004637X
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/23148
dc.language.isoenes
dc.publisherInstitute of Physics Publishinges
dc.rights.licenseCC BY 4.0
dc.subjectGlobular Clusterses
dc.subjectGiant Starses
dc.subjectGalaxieses
dc.titleConfirmation of a New Metal-poor Globular Cluster in the Galactic Bulgees
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