Discovery of VVV CL001: A low-mass globular cluster next to UKS 1 in the direction of the Galactic bulge

D. Minniti, M. Hempel, I. Toledo, V. D. Ivanov, J. Alonso-García, R. K. Saito, M. Catelan, D. Geisler, A. Jordán, J. Borissova, M. Zoccali, R. Kurtev, G. Carraro, B. Barbuy, J. Clariá, M. Rejkuba, J. Emerson, C. Moni Bidin

Resultado de la investigación: Article

36 Citas (Scopus)

Resumen

Context. It is not known how many globular clusters may remain undetected towards the Galactic bulge. Aims. One of the aims of the VISTA Variables in the Via Lactea (VVV) Survey is to accurately measure the physical parameters of the known globular clusters in the inner regions of the Milky Way and search for new ones, hidden in regions of large extinction. Methods. From deep near-infrared images, we derive deep JHKS-band photometry of a region surrounding the known globular cluster UKS 1 and reveal a new low-mass globular cluster candidate that we name VVV CL001. Results. We use the horizontal-branch red clump to measure E(B - V) ∼ 2.2 mag, (m - M)0 = 16.01 mag, and D = 15.9 kpc for the globular cluster UKS 1. On the basis of near-infrared colour - magnitude diagrams, we also find that VVV CL001 has E(B - V) ∼ 2.0, and that it is at least as metal-poor as UKS 1, although its distance remains uncertain. Conclusions. Our finding confirms the previous projection that the central region of the Milky Way harbours more globular clusters. VVV CL001 and UKS 1 are good candidates for a physical cluster binary, but follow-up observations are needed to decide if they are located at the same distance and have similar radial velocities.

Idioma originalEnglish
Número de artículoA81
PublicaciónAstronomy and Astrophysics
Volumen527
N.º10
DOI
EstadoPublished - 1 mar 2011

Huella dactilar

galactic bulge
globular clusters
near infrared
harbor
harbors
color-magnitude diagram
extinction
diagram
clumps
radial velocity
photometry
metal
projection
metals

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Minniti, D. ; Hempel, M. ; Toledo, I. ; Ivanov, V. D. ; Alonso-García, J. ; Saito, R. K. ; Catelan, M. ; Geisler, D. ; Jordán, A. ; Borissova, J. ; Zoccali, M. ; Kurtev, R. ; Carraro, G. ; Barbuy, B. ; Clariá, J. ; Rejkuba, M. ; Emerson, J. ; Moni Bidin, C. / Discovery of VVV CL001 : A low-mass globular cluster next to UKS 1 in the direction of the Galactic bulge. En: Astronomy and Astrophysics. 2011 ; Vol. 527, N.º 10.
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title = "Discovery of VVV CL001: A low-mass globular cluster next to UKS 1 in the direction of the Galactic bulge",
abstract = "Context. It is not known how many globular clusters may remain undetected towards the Galactic bulge. Aims. One of the aims of the VISTA Variables in the Via Lactea (VVV) Survey is to accurately measure the physical parameters of the known globular clusters in the inner regions of the Milky Way and search for new ones, hidden in regions of large extinction. Methods. From deep near-infrared images, we derive deep JHKS-band photometry of a region surrounding the known globular cluster UKS 1 and reveal a new low-mass globular cluster candidate that we name VVV CL001. Results. We use the horizontal-branch red clump to measure E(B - V) ∼ 2.2 mag, (m - M)0 = 16.01 mag, and D = 15.9 kpc for the globular cluster UKS 1. On the basis of near-infrared colour - magnitude diagrams, we also find that VVV CL001 has E(B - V) ∼ 2.0, and that it is at least as metal-poor as UKS 1, although its distance remains uncertain. Conclusions. Our finding confirms the previous projection that the central region of the Milky Way harbours more globular clusters. VVV CL001 and UKS 1 are good candidates for a physical cluster binary, but follow-up observations are needed to decide if they are located at the same distance and have similar radial velocities.",
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author = "D. Minniti and M. Hempel and I. Toledo and Ivanov, {V. D.} and J. Alonso-Garc{\'i}a and Saito, {R. K.} and M. Catelan and D. Geisler and A. Jord{\'a}n and J. Borissova and M. Zoccali and R. Kurtev and G. Carraro and B. Barbuy and J. Clari{\'a} and M. Rejkuba and J. Emerson and {Moni Bidin}, C.",
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Minniti, D, Hempel, M, Toledo, I, Ivanov, VD, Alonso-García, J, Saito, RK, Catelan, M, Geisler, D, Jordán, A, Borissova, J, Zoccali, M, Kurtev, R, Carraro, G, Barbuy, B, Clariá, J, Rejkuba, M, Emerson, J & Moni Bidin, C 2011, 'Discovery of VVV CL001: A low-mass globular cluster next to UKS 1 in the direction of the Galactic bulge', Astronomy and Astrophysics, vol. 527, n.º 10, A81. https://doi.org/10.1051/0004-6361/201015795

Discovery of VVV CL001 : A low-mass globular cluster next to UKS 1 in the direction of the Galactic bulge. / Minniti, D.; Hempel, M.; Toledo, I.; Ivanov, V. D.; Alonso-García, J.; Saito, R. K.; Catelan, M.; Geisler, D.; Jordán, A.; Borissova, J.; Zoccali, M.; Kurtev, R.; Carraro, G.; Barbuy, B.; Clariá, J.; Rejkuba, M.; Emerson, J.; Moni Bidin, C.

En: Astronomy and Astrophysics, Vol. 527, N.º 10, A81, 01.03.2011.

Resultado de la investigación: Article

TY - JOUR

T1 - Discovery of VVV CL001

T2 - A low-mass globular cluster next to UKS 1 in the direction of the Galactic bulge

AU - Minniti, D.

AU - Hempel, M.

AU - Toledo, I.

AU - Ivanov, V. D.

AU - Alonso-García, J.

AU - Saito, R. K.

AU - Catelan, M.

AU - Geisler, D.

AU - Jordán, A.

AU - Borissova, J.

AU - Zoccali, M.

AU - Kurtev, R.

AU - Carraro, G.

AU - Barbuy, B.

AU - Clariá, J.

AU - Rejkuba, M.

AU - Emerson, J.

AU - Moni Bidin, C.

PY - 2011/3/1

Y1 - 2011/3/1

N2 - Context. It is not known how many globular clusters may remain undetected towards the Galactic bulge. Aims. One of the aims of the VISTA Variables in the Via Lactea (VVV) Survey is to accurately measure the physical parameters of the known globular clusters in the inner regions of the Milky Way and search for new ones, hidden in regions of large extinction. Methods. From deep near-infrared images, we derive deep JHKS-band photometry of a region surrounding the known globular cluster UKS 1 and reveal a new low-mass globular cluster candidate that we name VVV CL001. Results. We use the horizontal-branch red clump to measure E(B - V) ∼ 2.2 mag, (m - M)0 = 16.01 mag, and D = 15.9 kpc for the globular cluster UKS 1. On the basis of near-infrared colour - magnitude diagrams, we also find that VVV CL001 has E(B - V) ∼ 2.0, and that it is at least as metal-poor as UKS 1, although its distance remains uncertain. Conclusions. Our finding confirms the previous projection that the central region of the Milky Way harbours more globular clusters. VVV CL001 and UKS 1 are good candidates for a physical cluster binary, but follow-up observations are needed to decide if they are located at the same distance and have similar radial velocities.

AB - Context. It is not known how many globular clusters may remain undetected towards the Galactic bulge. Aims. One of the aims of the VISTA Variables in the Via Lactea (VVV) Survey is to accurately measure the physical parameters of the known globular clusters in the inner regions of the Milky Way and search for new ones, hidden in regions of large extinction. Methods. From deep near-infrared images, we derive deep JHKS-band photometry of a region surrounding the known globular cluster UKS 1 and reveal a new low-mass globular cluster candidate that we name VVV CL001. Results. We use the horizontal-branch red clump to measure E(B - V) ∼ 2.2 mag, (m - M)0 = 16.01 mag, and D = 15.9 kpc for the globular cluster UKS 1. On the basis of near-infrared colour - magnitude diagrams, we also find that VVV CL001 has E(B - V) ∼ 2.0, and that it is at least as metal-poor as UKS 1, although its distance remains uncertain. Conclusions. Our finding confirms the previous projection that the central region of the Milky Way harbours more globular clusters. VVV CL001 and UKS 1 are good candidates for a physical cluster binary, but follow-up observations are needed to decide if they are located at the same distance and have similar radial velocities.

KW - globular clusters: general

KW - globular clusters: individual: UKS 1

KW - globular clusters: individual: VVV CL001

KW - surveys

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