CAPOS: The bulge Cluster APOgee Survey

Geisler, D.; Villanova, S.; O’Connell, Julia; Cohen, Roger E.; Bidin, C. Moni; Fernández-Trincado, J. G.; Muñoz, C.; Minniti, D.; Zoccali, M.; Rojas-Arriagada, Á.; Ramos, R. Contreras; Catelan, M.; Mauro, F.; Cortés, C.; Lopes, C. E. Ferreira; Arentsen, Anke; Starkenburg, Else; Martín, Nicolás F.; Tang, Baitian; Parisi, M. C.; Alonso-García, J.; Gran, F.; Cunha, Kátia; Smith, Verne V.; Majewski, Steven R.; Jönsson, Henrik; García–Hernández, D. A.; Horta, Danny; Mészáros, Szabolcs; Monaco, L.; Monachesi, Antonela; Muñoz, Ricardo R.; Brownstein, Joel R.; Barbuy, B.; Sobeck, Jennifer; Henao, Lady; González-Díaz, D.; Miranda, Raúl E.; Reinarz, Y.; Santander, Tatiana A.

doi:10.1051/0004-6361/202140436

Cited by 23 publications

(6 citation statements)

References 144 publications

(221 reference statements)

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“…8) NGC 6540 (Djorg 3) is a compact cluster that is located toward the Galactic bulge, with literature distances varying between d e = 3-5.3 kpc. The Harris (1996) [Fe/H] value for the cluster is −1.35 but literature estimates tend to vary considerably between −1.01 and −1.5 (Vulic et al 2018;Geisler et al 2021). NGC 6540 was assumed to be an open cluster until Bica et al (1994) confirmed its identity as a GC, with an extended blue HB.…”

Section: Ngc 6453 (Figurementioning

confidence: 99%

Blanco DECam Bulge Survey (BDBS). VI. Extinction Maps Toward Southern Galactic Bulge Globular Clusters

Kader

Pilachowski

Johnson

et al. 2023

ApJ

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We present wide-field, high resolution maps of the color excess for 14 globular clusters toward the Southern Galactic bulge. The maps were derived using Gaia EDR3 astrometry and stellar photometry from the Blanco DECam Bulge Survey, which is a deep, wide-field ugrizY photometric survey of the southern Galactic bulge. Comparisons with WISE 12 μm images of thermal continuum emission demonstrate that the maps presented here trace interstellar extinction by dust down to 5″ scales. We use the reddening-corrected photometry of proper motion-selected cluster stars to build color–magnitude diagrams for the target globular clusters, which show residual broadening in excess of that expected from the photometric errors alone. This residual broadening is likely to be driven by star-to-star elemental abundance variations.

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Section: Ngc 6453 (Figurementioning

confidence: 99%

Blanco DECam Bulge Survey (BDBS). VI. Extinction Maps Toward Southern Galactic Bulge Globular Clusters

Kader

Pilachowski

Johnson

et al. 2023

ApJ

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“…Figure 12 shows a more compact PM distribution for stars within the cluster area with respect to those in the comparison field, suggesting a cohesive structure. As most bulge GCs, Minni 48 follows the local bulge stellar content (Geisler et al 2021;Minniti et al 2021a,b)…”

Section: Colour-magnitude Diagramsmentioning

confidence: 98%

An intriguing globular cluster in the Galactic bulge from the VVV survey

Minniti

Palma²,

Camargo³

et al. 2021

A&A

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Context. Globular clusters (GCs) are the oldest objects known in the Milky Way, so each discovery of a new GC is astrophysically important. In the inner Galactic bulge regions these objects are difficult to find due to extreme crowding and extinction. However, recent near-IR surveys have discovered a number of new bulge GC candidates that need to be further investigated. Aims. Our main objective is to use public data from the Gaia mission, the VISTA Variables in the Via Lactea (VVV) survey, the Two Micron All Sky Survey, and the Wide-field Infrared Survey Explorer to measure the physical parameters of Minni 48, a new candidate globular star cluster located in the inner bulge of the Milky Way at l = 359.35 deg, b = 2.79 deg. The specific goals are to measure its main astrophysical parameters, such as size, proper motions, metallicity, reddening and extinction, distance, total luminosity, and age. Methods. Even though there is a bright foreground star contaminating the field, this cluster appears quite bright in near- and mid-IR images. The size of Minni 48 is derived from the cluster radial density profile, while its reddening and extinction are estimated from optical and near-IR reddening maps. We obtain statistically decontaminated optical and near-IR colour-magnitude diagrams (CMDs) for this cluster. Mean cluster proper motions are measured from Gaia data. The heliocentric cluster distance is determined from both the red clump (RC) and the red giant branch (RGB) tip magnitudes in the near-IR CMD, while the cluster metallicity is estimated from the RGB slope and the fit to theoretical stellar isochrones. Results. The size of this GC is found to be r = 6′±1′, and the reddening and extinction values are E(J − Ks) = 0.60 ± 0.05 mag, AG = 3.23 ± 0.10 mag, and AKs = 0.45 ± 0.05 mag. The resulting mean cluster proper motions are μα = −3.5 ± 0.5 mas yr−1 and μδ = −6.0 ± 0.5 mas yr−1. We also study the RR Lyrae stars recognized in the field, and we argue that they are not members of this GC. The magnitude of the RC in the near-IR CMD yields an accurate distance modulus estimate of (m − M)0 = 14.61 mag, equivalent to a distance D = 8.4 ± 1.0 kpc. Such a distance is consistent with the optical distance estimate, (m − M)0 = 14.67 mag, D = 8.6 ± 1.0 kpc, as well as with the distance estimated using the tip of the RGB, (m − M)0 = 14.45 mag, D = 7.8 ± 1.0 kpc. We also derive a cluster metallicity of [Fe/H] = − 0.20 ± 0.30 dex. Adopting these values of metallicity and distance, a good fit to the PARSEC stellar isochrones is obtained in all CMDs using Age = 10 ± 2 Gyr. The total absolute magnitude of this GC is estimated to be MKs = −9.04 ± 0.66 mag. Conclusions. Based on its position, kinematics, metallicity, and age, we conclude that Minni 48 is a genuine GC, similar to other well-known metal-rich bulge GCs. It is located at a projected galactocentric angular distance of 2.9 deg, equivalent to 0.4 kpc, situating this cluster as one of the closest GCs to the Galactic centre currently known.

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“…One hindrance in being able to draw connections between inner Galaxy GCs and place this population into context with Milky Way formation is that these are dense systems in a crowded, extinguished part of the Milky Way, so observational analysis of the inner Galaxy GCs is difficult. Many of them are understudied, with basic parameters such as radial velocities and metallicities being undetermined, prompting new spectroscopic surveys to target inner Galaxy GCs (e.g., Saviane et al 2012;Dias et al 2016;Geisler et al 2021;Kunder et al 2021). The Milky Way Bulge extra-tidal star survey, MWBest, has the goal of spectroscopically identifying stripped globular cluster stars from inner Galaxy clusters.…”

Section: Introductionmentioning

confidence: 99%

The Milky Way Bulge Extra-tidal Star Survey: BH 261 (AL 3)

Kunder,

Prudil,

Covey

et al. 2023

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The Milky Way Bulge extra-tidal star survey is a spectroscopic survey with the goal of identifying stripped globular cluster stars from inner Galaxy clusters. In this way, an indication of the fraction of metal-poor bulge stars that originated from globular clusters can be determined. We observed and analyzed stars in and around BH 261, an understudied globular cluster in the bulge. From seven giants within the tidal radius of the cluster, we measured an average heliocentric radial velocity of 〈RV〉 = −61 ± 2.6 km s−1 with a radial velocity dispersion of 〈σ〉 = 6.1 ± 1.9 km s−1. The large velocity dispersion may have arisen from tidal heating in the cluster’s orbit about the Galactic center, or because BH 261 has a high dynamical mass as well as a high mass-to-light ratio. From spectra of five giants, we measure an average metallicity of 〈[Fe/H]〉 = −1.1 ± 0.2 dex. We also spectroscopically confirm an RR Lyrae star in BH 261, which yields a distance to the cluster of 7.1 ± 0.4 kpc. Stars with 3D velocities and metallicities consistent with BH 261 reaching to ∼0.°5 from the cluster are identified. A handful of these stars are also consistent with the spatial distribution of potential debris from models focusing on the most recent disruption of the cluster.

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CAPOS: The bulge Cluster APOgee Survey

Cited by 23 publications

References 144 publications

Blanco DECam Bulge Survey (BDBS). VI. Extinction Maps Toward Southern Galactic Bulge Globular Clusters

Blanco DECam Bulge Survey (BDBS). VI. Extinction Maps Toward Southern Galactic Bulge Globular Clusters

An intriguing globular cluster in the Galactic bulge from the VVV survey

The Milky Way Bulge Extra-tidal Star Survey: BH 261 (AL 3)

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