New VVV Survey Globular Cluster Candidates in the Milky Way Bulge

Dante Minniti, Douglas Geisler, Javier Alonso-Garcia, Tali Palma, Juan Carlos Beamin, Jura Borissova, Marcio Catelan, Juan J. Clariá, Roger E. Cohen, Rodrigo Contreras Ramos, Bruno Dias, Jose G. Fernández-Trincado, Matias Gómez, Maren Hempel, Valentin D. Ivanov, Radostin Kurtev, Phillip W. Lucas, Christian Moni-Bidin, Joyce Pullen, Sebastian Ramirez AlegriaRoberto K. Saito, Elena Valenti

Resultado de la investigación: Article

18 Citas (Scopus)

Resumen

It is likely that a number of Galactic globular clusters remain to be discovered, especially toward the Galactic bulge. High stellar density combined with high and differential interstellar reddening are the two major problems for finding globular clusters located toward the bulge. We use the deep near-IR photometry of the VISTA Variables in the Via Láctea (VVV) Survey to search for globular clusters projected toward the Galactic bulge, and hereby report the discovery of 22 new candidate globular clusters. These objects, detected as high density regions in our maps of bulge red giants, are confirmed as globular cluster candidates by their color-magnitude diagrams. We provide their coordinates as well as their near-IR color-magnitude diagrams, from which some basic parameters are derived, such as reddenings and heliocentric distances. The color-magnitude diagrams reveal well defined red giant branches in all cases, often including a prominent red clump. The new globular cluster candidates exhibit a variety of extinctions (0.06 < A Ks < 2.77) and distances (5.3 < D < 9.5 kpc). We also classify the globular cluster candidates into 10 metal-poor and 12 metal-rich clusters, based on the comparison of their color-magnitude diagrams with those of known globular clusters also observed by the VVV Survey. Finally, we argue that the census for Galactic globular clusters still remains incomplete, and that many more candidate globular clusters (particularly the low luminosity ones) await to be found and studied in detail in the central regions of the Milky Way.

Idioma originalEnglish
Número de artículoL24
PublicaciónAstrophysical Journal Letters
Volumen849
N.º2
DOI
EstadoPublished - 10 nov 2017

Huella dactilar

globular clusters
diagram
color-magnitude diagram
metal
galactic bulge
census
extinction
interstellar extinction
clumps
metal clusters
photometry
luminosity

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Minniti, D., Geisler, D., Alonso-Garcia, J., Palma, T., Beamin, J. C., Borissova, J., ... Valenti, E. (2017). New VVV Survey Globular Cluster Candidates in the Milky Way Bulge. Astrophysical Journal Letters, 849(2), [L24]. https://doi.org/10.3847/2041-8213/aa95b8
Minniti, Dante ; Geisler, Douglas ; Alonso-Garcia, Javier ; Palma, Tali ; Beamin, Juan Carlos ; Borissova, Jura ; Catelan, Marcio ; Clariá, Juan J. ; Cohen, Roger E. ; Ramos, Rodrigo Contreras ; Dias, Bruno ; Fernández-Trincado, Jose G. ; Gómez, Matias ; Hempel, Maren ; Ivanov, Valentin D. ; Kurtev, Radostin ; Lucas, Phillip W. ; Moni-Bidin, Christian ; Pullen, Joyce ; Alegria, Sebastian Ramirez ; Saito, Roberto K. ; Valenti, Elena. / New VVV Survey Globular Cluster Candidates in the Milky Way Bulge. En: Astrophysical Journal Letters. 2017 ; Vol. 849, N.º 2.
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abstract = "It is likely that a number of Galactic globular clusters remain to be discovered, especially toward the Galactic bulge. High stellar density combined with high and differential interstellar reddening are the two major problems for finding globular clusters located toward the bulge. We use the deep near-IR photometry of the VISTA Variables in the Via L{\'a}ctea (VVV) Survey to search for globular clusters projected toward the Galactic bulge, and hereby report the discovery of 22 new candidate globular clusters. These objects, detected as high density regions in our maps of bulge red giants, are confirmed as globular cluster candidates by their color-magnitude diagrams. We provide their coordinates as well as their near-IR color-magnitude diagrams, from which some basic parameters are derived, such as reddenings and heliocentric distances. The color-magnitude diagrams reveal well defined red giant branches in all cases, often including a prominent red clump. The new globular cluster candidates exhibit a variety of extinctions (0.06 < A Ks < 2.77) and distances (5.3 < D < 9.5 kpc). We also classify the globular cluster candidates into 10 metal-poor and 12 metal-rich clusters, based on the comparison of their color-magnitude diagrams with those of known globular clusters also observed by the VVV Survey. Finally, we argue that the census for Galactic globular clusters still remains incomplete, and that many more candidate globular clusters (particularly the low luminosity ones) await to be found and studied in detail in the central regions of the Milky Way.",
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Minniti, D, Geisler, D, Alonso-Garcia, J, Palma, T, Beamin, JC, Borissova, J, Catelan, M, Clariá, JJ, Cohen, RE, Ramos, RC, Dias, B, Fernández-Trincado, JG, Gómez, M, Hempel, M, Ivanov, VD, Kurtev, R, Lucas, PW, Moni-Bidin, C, Pullen, J, Alegria, SR, Saito, RK & Valenti, E 2017, 'New VVV Survey Globular Cluster Candidates in the Milky Way Bulge', Astrophysical Journal Letters, vol. 849, n.º 2, L24. https://doi.org/10.3847/2041-8213/aa95b8

New VVV Survey Globular Cluster Candidates in the Milky Way Bulge. / Minniti, Dante; Geisler, Douglas; Alonso-Garcia, Javier; Palma, Tali; Beamin, Juan Carlos; Borissova, Jura; Catelan, Marcio; Clariá, Juan J.; Cohen, Roger E.; Ramos, Rodrigo Contreras; Dias, Bruno; Fernández-Trincado, Jose G.; Gómez, Matias; Hempel, Maren; Ivanov, Valentin D.; Kurtev, Radostin; Lucas, Phillip W.; Moni-Bidin, Christian; Pullen, Joyce; Alegria, Sebastian Ramirez; Saito, Roberto K.; Valenti, Elena.

En: Astrophysical Journal Letters, Vol. 849, N.º 2, L24, 10.11.2017.

Resultado de la investigación: Article

TY - JOUR

T1 - New VVV Survey Globular Cluster Candidates in the Milky Way Bulge

AU - Minniti, Dante

AU - Geisler, Douglas

AU - Alonso-Garcia, Javier

AU - Palma, Tali

AU - Beamin, Juan Carlos

AU - Borissova, Jura

AU - Catelan, Marcio

AU - Clariá, Juan J.

AU - Cohen, Roger E.

AU - Ramos, Rodrigo Contreras

AU - Dias, Bruno

AU - Fernández-Trincado, Jose G.

AU - Gómez, Matias

AU - Hempel, Maren

AU - Ivanov, Valentin D.

AU - Kurtev, Radostin

AU - Lucas, Phillip W.

AU - Moni-Bidin, Christian

AU - Pullen, Joyce

AU - Alegria, Sebastian Ramirez

AU - Saito, Roberto K.

AU - Valenti, Elena

PY - 2017/11/10

Y1 - 2017/11/10

N2 - It is likely that a number of Galactic globular clusters remain to be discovered, especially toward the Galactic bulge. High stellar density combined with high and differential interstellar reddening are the two major problems for finding globular clusters located toward the bulge. We use the deep near-IR photometry of the VISTA Variables in the Via Láctea (VVV) Survey to search for globular clusters projected toward the Galactic bulge, and hereby report the discovery of 22 new candidate globular clusters. These objects, detected as high density regions in our maps of bulge red giants, are confirmed as globular cluster candidates by their color-magnitude diagrams. We provide their coordinates as well as their near-IR color-magnitude diagrams, from which some basic parameters are derived, such as reddenings and heliocentric distances. The color-magnitude diagrams reveal well defined red giant branches in all cases, often including a prominent red clump. The new globular cluster candidates exhibit a variety of extinctions (0.06 < A Ks < 2.77) and distances (5.3 < D < 9.5 kpc). We also classify the globular cluster candidates into 10 metal-poor and 12 metal-rich clusters, based on the comparison of their color-magnitude diagrams with those of known globular clusters also observed by the VVV Survey. Finally, we argue that the census for Galactic globular clusters still remains incomplete, and that many more candidate globular clusters (particularly the low luminosity ones) await to be found and studied in detail in the central regions of the Milky Way.

AB - It is likely that a number of Galactic globular clusters remain to be discovered, especially toward the Galactic bulge. High stellar density combined with high and differential interstellar reddening are the two major problems for finding globular clusters located toward the bulge. We use the deep near-IR photometry of the VISTA Variables in the Via Láctea (VVV) Survey to search for globular clusters projected toward the Galactic bulge, and hereby report the discovery of 22 new candidate globular clusters. These objects, detected as high density regions in our maps of bulge red giants, are confirmed as globular cluster candidates by their color-magnitude diagrams. We provide their coordinates as well as their near-IR color-magnitude diagrams, from which some basic parameters are derived, such as reddenings and heliocentric distances. The color-magnitude diagrams reveal well defined red giant branches in all cases, often including a prominent red clump. The new globular cluster candidates exhibit a variety of extinctions (0.06 < A Ks < 2.77) and distances (5.3 < D < 9.5 kpc). We also classify the globular cluster candidates into 10 metal-poor and 12 metal-rich clusters, based on the comparison of their color-magnitude diagrams with those of known globular clusters also observed by the VVV Survey. Finally, we argue that the census for Galactic globular clusters still remains incomplete, and that many more candidate globular clusters (particularly the low luminosity ones) await to be found and studied in detail in the central regions of the Milky Way.

KW - Galaxy: bulge

KW - Galaxy: general

KW - globular clusters: general

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U2 - 10.3847/2041-8213/aa95b8

DO - 10.3847/2041-8213/aa95b8

M3 - Article

AN - SCOPUS:85034430943

VL - 849

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

SN - 2041-8205

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M1 - L24

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Minniti D, Geisler D, Alonso-Garcia J, Palma T, Beamin JC, Borissova J y otros. New VVV Survey Globular Cluster Candidates in the Milky Way Bulge. Astrophysical Journal Letters. 2017 nov 10;849(2). L24. https://doi.org/10.3847/2041-8213/aa95b8