Artículo
Analysis of the physical nature of 22 New VVV Survey Globular Cluster candidates in the Milky Way bulge
Palma, Tali
; Minniti, Dante; Alonso García, Javier; Crestani, Juliana; Netzel, Henryka; Clariá, Juan José
; Saito, Roberto; Dias, Bruno; Fernández Trincado, José G.; Kammers, Roberto; Geisler, Douglas; Gómez, Matías; Hempel, Maren; Pullen, Joyce
Fecha de publicación:
08/2019
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Monthly Notices of the Royal Astronomical Society
ISSN:
0035-8711
e-ISSN:
1365-2966
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In order to characterize 22 new globular cluster (GC) candidates in the Galactic bulge, we present their colour-magnitude diagrams (CMDs) and Ks-band luminosity functions (LFs) using the near-infrared VVV database as well as Gaia-DR2 proper motion data set. CMDs were obtained, on one hand, after properly decontaminating the observed diagrams from background/foreground disc stars and other sources. On the other hand, CMDs were also obtained based upon star selection in proper motion diagrams. Taking into account our deep CMDs and LFs analyses, we find that 17 out of 22 new GC candidates may be real and should therefore be followed up, while 5 candidates were discarded from the original sample. We also search for RR Lyrae and Mira variable stars in the fields of these new GC candidates. In particular, we confirm that Minni 40 may be a real cluster. If confirmed by further follow-up analysis, it would be the closest GC to the Galactic centre in projected angular distance, located only 0.5° away from it. We consider that it is very difficult to confirm the physical reality of these small, poorly-populated bulge GCs so in many cases alternative techniques are needed to corroborate our findings.
Palabras clave:
GALAXY: BULGE
,
GLOBULAR CLUSTERS: GENERAL
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Articulos(CCT - CORDOBA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CORDOBA
Citación
Palma, Tali; Minniti, Dante; Alonso García, Javier; Crestani, Juliana; Netzel, Henryka; et al.; Analysis of the physical nature of 22 New VVV Survey Globular Cluster candidates in the Milky Way bulge; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 487; 3; 8-2019; 3140-3149
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