Analysis of the physical nature of 22 New VVV Survey Globular Cluster candidates in the Milky Way bulge

Tali Palma, Dante Minniti, Javier Alonso-García, Juliana Crestani, Henryka Netzel, Juan J. Clariá, Roberto K. Saito, Bruno Dias, José G. Fernández-Trincado, Roberto Kammers, Douglas Geisler, Matías Gómez, Maren Hempel, Joyce Pullen

Resultado de la investigación: Article

2 Citas (Scopus)

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 originalEnglish
Número de artículostz1489
Páginas (desde-hasta)3140-3149
Número de páginas10
PublicaciónMonthly Notices of the Royal Astronomical Society
Volumen487
N.º3
DOI
EstadoPublished - ago 2019

Huella dactilar

color-magnitude diagram
globular clusters
diagram
proper motion
diagrams
luminosity
Mira variables
stars
galactic bulge
variable stars
analysis
near infrared

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

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. / Analysis of the physical nature of 22 New VVV Survey Globular Cluster candidates in the Milky Way bulge. En: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 487, N.º 3. pp. 3140-3149.
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title = "Analysis of the physical nature of 22 New VVV Survey Globular Cluster candidates in the Milky Way bulge",
abstract = "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.",
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author = "Tali Palma and Dante Minniti and Javier Alonso-Garc{\'i}a and Juliana Crestani and Henryka Netzel and Clari{\'a}, {Juan J.} and Saito, {Roberto K.} and Bruno Dias and Fern{\'a}ndez-Trincado, {Jos{\'e} G.} and Roberto Kammers and Douglas Geisler and Mat{\'i}as G{\'o}mez and Maren Hempel and Joyce Pullen",
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month = "8",
doi = "10.1093/mnras/stz1489",
language = "English",
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journal = "Monthly Notices of the Royal Astronomical Society",
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Palma, T, Minniti, D, Alonso-García, J, Crestani, J, Netzel, H, Clariá, JJ, Saito, RK, Dias, B, Fernández-Trincado, JG, Kammers, R, Geisler, D, Gómez, M, Hempel, M & Pullen, J 2019, 'Analysis of the physical nature of 22 New VVV Survey Globular Cluster candidates in the Milky Way bulge', Monthly Notices of the Royal Astronomical Society, vol. 487, n.º 3, stz1489, pp. 3140-3149. https://doi.org/10.1093/mnras/stz1489

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

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M1 - stz1489

ER -