Confirmation of a New Metal-poor Globular Cluster in the Galactic Bulge

Dante Minniti, E. F. Schlafly, Tali Palma, Juan J. Clariá, Maren Hempel, Javier Alonso-García, Eduardo Bica, Charles Bonatto, Vittorio F. Braga, Gisella Clementini, Alessia Garofalo, Matías Gómez, Valentin D. Ivanov, Phillip W. Lucas, Joyce Pullen, Roberto K. Saito, Leigh C. Smith

Resultado de la investigación: Article

1 Cita (Scopus)

Resumen

We use deep near-IR photometry of the VISTA Variables in the V'a L'ctea (VVV) Survey and deep DECam Plane Survey (DECaPS) optical photometry to confirm the physical reality of the candidate globular cluster (GC) Minni 22, which is located in the Galactic bulge. This object, which was detected as a high density region in our maps of bulge red giants, is now confirmed as a real GC based on the optical and near-IR color'magnitude diagrams. We also recover three known fundamental mode (ab type) RR Lyrae stars within 2 arcmin of the cluster center. The presence of RR Lyrae stars also seems to confirm Minni 22 as a bonafide old and metal-poor GC. We estimate a cluster reddening E(J - Ks) = 0.6 mag and determine its heliocentric distance D = 7.4 ± 0.3 kpc. The optical and near-IR color'magnitude diagrams reveal well-defined red giant branches in all cases, including a red giant branch bump at Ks = 13.30 ± 0.05 mag. The comparison with theoretical isochrones yields a mean metallicity of [Fe/H] = -1.3 ± 0.3 dex, and age of t ∼ 11.2 Gyr. This is a good example of a new low-luminosity (MV = -6.2 mag) GC found in the central bulge of the Milky Way. After discussing the different ways to confirm the existence of bulge GC candidates, we find that one of the best methods is to use the CMDs from the combination of the DECaPS + VVV photometries.

Idioma originalEnglish
Número de artículo12
PublicaciónAstrophysical Journal
Volumen866
N.º1
DOI
EstadoPublished - 10 oct 2018

Huella dactilar

galactic bulge
globular clusters
metal
photometry
diagram
metals
color-magnitude diagram
stars
metallicity
luminosity
estimates

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Minniti, D., Schlafly, E. F., Palma, T., Clariá, J. J., Hempel, M., Alonso-García, J., ... Smith, L. C. (2018). Confirmation of a New Metal-poor Globular Cluster in the Galactic Bulge. Astrophysical Journal, 866(1), [12]. https://doi.org/10.3847/1538-4357/aadd06
Minniti, Dante ; Schlafly, E. F. ; Palma, Tali ; Clariá, Juan J. ; Hempel, Maren ; Alonso-García, Javier ; Bica, Eduardo ; Bonatto, Charles ; Braga, Vittorio F. ; Clementini, Gisella ; Garofalo, Alessia ; Gómez, Matías ; Ivanov, Valentin D. ; Lucas, Phillip W. ; Pullen, Joyce ; Saito, Roberto K. ; Smith, Leigh C. / Confirmation of a New Metal-poor Globular Cluster in the Galactic Bulge. En: Astrophysical Journal. 2018 ; Vol. 866, N.º 1.
@article{934fc2162a134e89b071eb3447ec514a,
title = "Confirmation of a New Metal-poor Globular Cluster in the Galactic Bulge",
abstract = "We use deep near-IR photometry of the VISTA Variables in the V'a L'ctea (VVV) Survey and deep DECam Plane Survey (DECaPS) optical photometry to confirm the physical reality of the candidate globular cluster (GC) Minni 22, which is located in the Galactic bulge. This object, which was detected as a high density region in our maps of bulge red giants, is now confirmed as a real GC based on the optical and near-IR color'magnitude diagrams. We also recover three known fundamental mode (ab type) RR Lyrae stars within 2 arcmin of the cluster center. The presence of RR Lyrae stars also seems to confirm Minni 22 as a bonafide old and metal-poor GC. We estimate a cluster reddening E(J - Ks) = 0.6 mag and determine its heliocentric distance D = 7.4 ± 0.3 kpc. The optical and near-IR color'magnitude diagrams reveal well-defined red giant branches in all cases, including a red giant branch bump at Ks = 13.30 ± 0.05 mag. The comparison with theoretical isochrones yields a mean metallicity of [Fe/H] = -1.3 ± 0.3 dex, and age of t ∼ 11.2 Gyr. This is a good example of a new low-luminosity (MV = -6.2 mag) GC found in the central bulge of the Milky Way. After discussing the different ways to confirm the existence of bulge GC candidates, we find that one of the best methods is to use the CMDs from the combination of the DECaPS + VVV photometries.",
keywords = "Galaxy: bulge, Galaxy: evolution, globular clusters: general, globular clusters: individual (Minni 22)",
author = "Dante Minniti and Schlafly, {E. F.} and Tali Palma and Clari{\'a}, {Juan J.} and Maren Hempel and Javier Alonso-Garc{\'i}a and Eduardo Bica and Charles Bonatto and Braga, {Vittorio F.} and Gisella Clementini and Alessia Garofalo and Mat{\'i}as G{\'o}mez and Ivanov, {Valentin D.} and Lucas, {Phillip W.} and Joyce Pullen and Saito, {Roberto K.} and Smith, {Leigh C.}",
year = "2018",
month = "10",
day = "10",
doi = "10.3847/1538-4357/aadd06",
language = "English",
volume = "866",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

Minniti, D, Schlafly, EF, Palma, T, Clariá, JJ, Hempel, M, Alonso-García, J, Bica, E, Bonatto, C, Braga, VF, Clementini, G, Garofalo, A, Gómez, M, Ivanov, VD, Lucas, PW, Pullen, J, Saito, RK & Smith, LC 2018, 'Confirmation of a New Metal-poor Globular Cluster in the Galactic Bulge', Astrophysical Journal, vol. 866, n.º 1, 12. https://doi.org/10.3847/1538-4357/aadd06

Confirmation of a New Metal-poor Globular Cluster in the Galactic Bulge. / Minniti, Dante; Schlafly, E. F.; Palma, Tali; Clariá, Juan J.; Hempel, Maren; Alonso-García, Javier; Bica, Eduardo; Bonatto, Charles; Braga, Vittorio F.; Clementini, Gisella; Garofalo, Alessia; Gómez, Matías; Ivanov, Valentin D.; Lucas, Phillip W.; Pullen, Joyce; Saito, Roberto K.; Smith, Leigh C.

En: Astrophysical Journal, Vol. 866, N.º 1, 12, 10.10.2018.

Resultado de la investigación: Article

TY - JOUR

T1 - Confirmation of a New Metal-poor Globular Cluster in the Galactic Bulge

AU - Minniti, Dante

AU - Schlafly, E. F.

AU - Palma, Tali

AU - Clariá, Juan J.

AU - Hempel, Maren

AU - Alonso-García, Javier

AU - Bica, Eduardo

AU - Bonatto, Charles

AU - Braga, Vittorio F.

AU - Clementini, Gisella

AU - Garofalo, Alessia

AU - Gómez, Matías

AU - Ivanov, Valentin D.

AU - Lucas, Phillip W.

AU - Pullen, Joyce

AU - Saito, Roberto K.

AU - Smith, Leigh C.

PY - 2018/10/10

Y1 - 2018/10/10

N2 - We use deep near-IR photometry of the VISTA Variables in the V'a L'ctea (VVV) Survey and deep DECam Plane Survey (DECaPS) optical photometry to confirm the physical reality of the candidate globular cluster (GC) Minni 22, which is located in the Galactic bulge. This object, which was detected as a high density region in our maps of bulge red giants, is now confirmed as a real GC based on the optical and near-IR color'magnitude diagrams. We also recover three known fundamental mode (ab type) RR Lyrae stars within 2 arcmin of the cluster center. The presence of RR Lyrae stars also seems to confirm Minni 22 as a bonafide old and metal-poor GC. We estimate a cluster reddening E(J - Ks) = 0.6 mag and determine its heliocentric distance D = 7.4 ± 0.3 kpc. The optical and near-IR color'magnitude diagrams reveal well-defined red giant branches in all cases, including a red giant branch bump at Ks = 13.30 ± 0.05 mag. The comparison with theoretical isochrones yields a mean metallicity of [Fe/H] = -1.3 ± 0.3 dex, and age of t ∼ 11.2 Gyr. This is a good example of a new low-luminosity (MV = -6.2 mag) GC found in the central bulge of the Milky Way. After discussing the different ways to confirm the existence of bulge GC candidates, we find that one of the best methods is to use the CMDs from the combination of the DECaPS + VVV photometries.

AB - We use deep near-IR photometry of the VISTA Variables in the V'a L'ctea (VVV) Survey and deep DECam Plane Survey (DECaPS) optical photometry to confirm the physical reality of the candidate globular cluster (GC) Minni 22, which is located in the Galactic bulge. This object, which was detected as a high density region in our maps of bulge red giants, is now confirmed as a real GC based on the optical and near-IR color'magnitude diagrams. We also recover three known fundamental mode (ab type) RR Lyrae stars within 2 arcmin of the cluster center. The presence of RR Lyrae stars also seems to confirm Minni 22 as a bonafide old and metal-poor GC. We estimate a cluster reddening E(J - Ks) = 0.6 mag and determine its heliocentric distance D = 7.4 ± 0.3 kpc. The optical and near-IR color'magnitude diagrams reveal well-defined red giant branches in all cases, including a red giant branch bump at Ks = 13.30 ± 0.05 mag. The comparison with theoretical isochrones yields a mean metallicity of [Fe/H] = -1.3 ± 0.3 dex, and age of t ∼ 11.2 Gyr. This is a good example of a new low-luminosity (MV = -6.2 mag) GC found in the central bulge of the Milky Way. After discussing the different ways to confirm the existence of bulge GC candidates, we find that one of the best methods is to use the CMDs from the combination of the DECaPS + VVV photometries.

KW - Galaxy: bulge

KW - Galaxy: evolution

KW - globular clusters: general

KW - globular clusters: individual (Minni 22)

UR - http://www.scopus.com/inward/record.url?scp=85055288213&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/aadd06

DO - 10.3847/1538-4357/aadd06

M3 - Article

AN - SCOPUS:85055288213

VL - 866

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 12

ER -

Minniti D, Schlafly EF, Palma T, Clariá JJ, Hempel M, Alonso-García J y otros. Confirmation of a New Metal-poor Globular Cluster in the Galactic Bulge. Astrophysical Journal. 2018 oct 10;866(1). 12. https://doi.org/10.3847/1538-4357/aadd06