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.
| Idioma original | English |
|---|---|
| Número de artículo | stz1489 |
| Páginas (desde-hasta) | 3140-3149 |
| Número de páginas | 10 |
| Publicación | Monthly Notices of the Royal Astronomical Society |
| Volumen | 487 |
| N.º | 3 |
| DOI | |
| Estado | Published - ago 2019 |
Huella dactilar
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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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 J.; Saito, Roberto K.; Dias, Bruno; Fernández-Trincado, José G.; Kammers, Roberto; Geisler, Douglas; Gómez, Matías; Hempel, Maren; Pullen, Joyce.
En: Monthly Notices of the Royal Astronomical Society, Vol. 487, N.º 3, stz1489, 08.2019, p. 3140-3149.Resultado de la investigación: Article
TY - JOUR
T1 - Analysis of the physical nature of 22 New VVV Survey Globular Cluster candidates in the Milky Way bulge
AU - Palma, Tali
AU - Minniti, Dante
AU - Alonso-García, Javier
AU - Crestani, Juliana
AU - Netzel, Henryka
AU - Clariá, Juan J.
AU - Saito, Roberto K.
AU - Dias, Bruno
AU - Fernández-Trincado, José G.
AU - Kammers, Roberto
AU - Geisler, Douglas
AU - Gómez, Matías
AU - Hempel, Maren
AU - Pullen, Joyce
PY - 2019/8
Y1 - 2019/8
N2 - 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.
AB - 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.
KW - Galaxy: bulge
KW - Globular clusters: general
UR - http://www.scopus.com/inward/record.url?scp=85072240890&partnerID=8YFLogxK
U2 - 10.1093/mnras/stz1489
DO - 10.1093/mnras/stz1489
M3 - Article
AN - SCOPUS:85072240890
VL - 487
SP - 3140
EP - 3149
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 1745-3925
IS - 3
M1 - stz1489
ER -