A census of new globular clusters in the Galactic bulge

Abstract

The number of known globular clusters in the Galactic bulge has been increasing steadily thanks to different new surveys. The aim of this study is to provide a census of the newly revealed globular clusters in the Galactic bulge, and analyze their characteristics. In recent years, many globular clusters have been discovered or identified. The stellar populations to which they belong are indicated in their original studies: they are mostly bulge clusters, with some identified as disk or halo members. We collected 41 new globular clusters revealed in the last decade and compared them to the known bulge clusters. The new clusters are intrinsically faint with $M_V$ of around -6.0 mag. The distance to the Sun of the ensemble of well-known and new bulge clusters is compatible with the Galactocentric distance measurements from the Galactic black hole location. The ensemble sample shows metallicity peaks at [Fe/H] ~ -1.08 $\pm$ 0.35 and -0.51 $\pm$ 0.25 dex, confirming previous findings. The age-metallicity relation of the new clusters younger than 10 Gyr is compatible with that of the ex situ samples of the dwarf galaxies Sagittarius, Canis Majoris, and Gaia-Enceladus-Sausage. The clusters with ages between 11.5 and 13.5 Gyr show no age-metallicity relation, because they are all old. This is compatible with their formation in situ in the early Galaxy.

9 pages, 5 figures. Accepted for publication in A&A. Galactic coordinates of Minni 22 and Gran 5 were corrected in the new version

References in corpus (102)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Gaia Data Release 3: Summary of the content and survey properties
• The Dartmouth Stellar Evolution Database
• The Galaxy in Context: Structural, Kinematic and Integrated Properties
• The merger that led to the formation of the Milky Way's inner stellar halo and thick disk
• Co-formation of the Galactic disc and the stellar halo
• A geometric distance measurement to the Galactic Center black hole with 0.3% uncertainty
• Intrinsic iron spread and a new metallicity scale for Globular Clusters
• A large stellar evolution database for population synthesis studies. II. Stellar models and isochrones for an alpha-enhanced metal distribution
• Reddening and Extinction Toward the Galactic Bulge from OGLE-III: The Inner Milky Way's Rv ~ 2.5 Extinction Curve
• Evidence for Two Early Accretion Events That Built the Milky Way Stellar Halo
• The ACS Survey of Galactic Globular Clusters. VII. Relative Ages
• The Ages of 55 Globular Clusters as Determined Using an Improved delta V_TO^HB Method Along with Color-Magnitude Diagram Constraints, and Their Implications for Broader Issues
• Gaia EDR3 view on Galactic globular clusters
• Origin of the system of globular clusters in the Milky Way
• Accurate distances to Galactic globular clusters through a combination of Gaia EDR3, HST and literature data
• The formation and assembly history of the Milky Way revealed by its globular cluster population
• The ACS Virgo Cluster Survey. XII. The Luminosity Function of Globular Clusters in Early Type Galaxies
• ARGOS III: Stellar Populations in the Galactic Bulge of the Milky Way
• Kraken reveals itself -- the merger history of the Milky Way reconstructed with the E-MOSAICS simulations
• The Bifurcated Age-Metallicity Relation of Milky Way Globular Clusters and its Implications For the Accretion History of the Galaxy
• Chemodynamical history of the Galactic Bulge
• Globular clusters in the outer Galactic halo: new HST/ACS imaging of 6 globular clusters and the Galactic globular cluster age-metallicity relation
• Globular cluster system and Milky Way properties revisited
• From the bulge to the outer disc: StarHorse stellar parameters, distances, and extinctions for stars in APOGEE DR16 and other spectroscopic surveys
• Reverse engineering the Milky Way
• The GIRAFFE Inner Bulge Survey (GIBS) III. Metallicity distributions and kinematics of 26 Galactic bulge fields
• The chemical characterisation of halo substructure in the Milky Way based on APOGEE
• The Milky Way bar and bulge revealed by APOGEE DR16 and Gaia EDR3
• An abundance analysis for four Red Horizontal Branch Stars in the extremely metal rich globular cluster NGC 6528
• Ceci n'est pas a globular cluster: the metallicity distribution of the stellar system Terzan 5
• Isochrones for Old (> 5 Gyr) Stars and Stellar Populations. I. Models for $-2.4\le$ [Fe/H] $\le +0.6$, $0.25\le Y\le 0.33$, and $-0.4\le$ [$\alpha$\Fe] $\le +0.4$
• High resolution infrared spectra of bulge globular clusters: Liller~1 and NGC 6553
• A Sequoia in the Garden: FSR 1758 - Dwarf Galaxy or Giant Globular Cluster?
• FORS2/VLT survey of Milky Way globular clusters II. Fe and Mg abundances of 51 Milky Way globular clusters on a homogeneous scale
• Globular clusters in the Galactic bulge
• A Multi-Band Catalog of 10978 Star Clusters, Associations and Candidates in the Milky Way
• Reconstructing the Disrupted Dwarf Galaxy $Gaia$-Sausage/Enceladus Using its Stars and Globular Clusters
• High resolution infrared spectra of bulge globular clusters: The extreme chemical abundances of Terzan 4 and Terzan 5
• The age of the young bulge-like population in the stellar system Terzan5: linking the Galactic bulge to the high-z Universe
• VLT-FLAMES Analysis of 8 giants in the Bulge Metal-poor Globular Cluster NGC 6522: Oldest Cluster in the Galaxy?
• Discovery of VVV CL001. A Low-Mass Globular Cluster Next to UKS~1 in the Direction of the Galactic Bulge
• Gemini-Phoenix infrared high-resolution abundance analysis of five giants in the bulge globular cluster NGC 6553
• Distances of the bulge globular clusters Terzan 5, Liller 1, UKS 1 and Terzan 4 based on HST NICMOS photometry
• The Metal Content of the Bulge Globular Cluster NGC 6528
• Three Galactic globular cluster candidates
• The WFC3 Galactic Bulge Treasury Program: Relative Ages of Bulge Stars of High and Low Metallicity
• A Deep View of a Fossil Relic in the Galactic Bulge: The Globular Cluster HP1
• A new class of fossil fragments from the hierarchical assembly of the Galactic bulge
• Red giant branch stars as probes of stellar populations. II. Properties of the newly discovered globular cluster GLIMPSE-C01
• Ages of the Bulge globular clusters NGC 6522 and NGC 6626 (M28) from HST Proper-motion-cleaned Color-Magnitude Diagrams
• Chemical analysis of NGC 6528: one of the most metal-rich bulge globular cluster
• VLT-UVES abundance analysis of four giants in NGC 6553
• Ultra-deep GEMINI near-infrared observations of the bulge globular cluster NGC 6624
• Homogeneous metallicities and radial velocities for Galactic globular clusters. II. New CaT metallicities for 28 distant and reddened globular clusters
• A spectroscopic study of the Globular Cluster M28 (NGC~6626)
• High-resolution abundance analysis of red giants in the metal-poor bulge globular cluster HP~1
• CAPOS: The bulge Cluster APOgee Survey I. Overview and initial ASPCAP results
• Globular cluster candidates in the Galactic bulge: Gaia and VVV view of the latest discoveries
• H-band discovery of additional Second-Generation stars in the Galactic Bulge Globular Cluster NGC 6522 as observed by APOGEE and Gaia
• Three candidate globular clusters discovered in the Galactic bulge
• Abundances of disk and bulge giants from hi-res optical spectra: II. O, Mg, Ca, and Ti in the bulge sample
• Discovery of Two New Globular Clusters in the Milky Way
• High-resolution abundance analysis of four red giants in the globular cluster NGC 6558
• Self-consistent analysis of stellar clusters: An application to HST data of the halo globular cluster NGC 6752
• VVV CL001: Likely the Most Metal-Poor Surviving Globular Cluster in the Inner Galaxy
• Detailed chemical composition and orbit of the new globular cluster FSR1758: Implications for the accretion of the Sequoia dwarf galaxy onto the Milky Way
• The enigmatic globular cluster UKS~1 obscured by the bulge: \textit{H}-band discovery of nitrogen-enhanced stars
• APOGEE discovery of a chemically atypical star disrupted from NGC 6723 and captured by the Milky Way bulge
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XX. Ages of single and multiple stellar populations in seven bulge globular clusters
• A stellar census in globular clusters with MUSE -- Extending the CaT-metallicity relation below the horizontal branch and applying it to multiple populations
• VVVX-Gaia Discovery of a Low Luminosity Globular Cluster in the Milky Way Disk
• ESO452-SC11: The lowest mass globular cluster with a potential chemical inhomogeneity
• First evidence of multi-iron sub-populations in the Bulge Fossil Fragment candidate Liller 1
• Obscured clusters. II. GLIMPSE-C02 - A new metal rich globular cluster in the Milky Way
• A new identity card for the bulge globular cluster NGC 6440 from resolved star counts
• Discovery of a new nearby globular cluster with extreme kinematics located in the extension of a halo stream
• Confirmation and physical characterization of the new bulge globular cluster Patchick 99 from the VVV and Gaia surveys
• The most metal-poor Galactic globular cluster: the first spectroscopic observations of ESO280-SC06
• Hidden in the Haystack: Low-luminosity globular clusters towards the Milky Way bulge
• New Galactic Star Clusters Discovered in the Disk Area of the VVVX Survey
• Chemical abundances in the metal-intermediate GC NGC 6723
• Unveiling the nature of 12 new low-luminosity Galactic Globular Cluster Candidates
• On the Color-Metallicity Relation of the Red Clump and the Reddening Toward the Magellanic Clouds
• Another relic bulge globular cluster: ESO 456-SC38 (Djorgovski~2)
• The Chemical Composition of Red Giant Branch Stars in the Galactic Globular Clusters NGC 6342 and NGC 6366
• Milky Way demographics with the VVV Survey III. Evidence for a Great Dark Lane in the 157 Million Star Bulge Color-Magnitude Diagram
• Spatial Distribution of Globular Clusters in the Galaxy
• A new low-luminosity globular cluster discovered in the Milky Way with the VVVX survey
• Halo intruders in the Galactic bulge revealed by HST and Gaia: the globular clusters Terzan 10 and Djorgovski 1
• APOGEE-2S view of the globular cluster Patchick 125 (Gran 3). New metallicity and elemental abundances from high-resolution spectroscopy
• Chrono-chemodynamical analysis of the globular cluster NGC 6355: Looking for the fundamental bricks of the Bulge
• Gaia-IGRINS synergy: Orbits of Newly Identified Milky Way Star Clusters
• Ca Triplet Metallicities and Velocities for twelve Globular Clusters towards the Galactic Bulge
• An Intriguing Globular Cluster in the Galactic Bulge from the VVV Survey
• High-resolution near-infrared spectroscopy of globular cluster and field stars toward the Galactic bulge
• The Interstellar Extinction Toward the Milky Way Bulge with Planetary Nebulae, Red Clump, and RR Lyrae stars
• Dust Properties in the Galactic Bulge
• Chemical analysis of the Bulge Globular Cluster NGC 6553
• Chemical Abundances of the Highly Obscured Galactic Globular Clusters 2MASS GC02 and Mercer 5
• A MUSE study of the inner bulge globular cluster Terzan 9: a fossil record in the Galaxy
• Precise distances from OGLE-IV member RR Lyrae stars in six bulge globular clusters

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• CAPOS: The bulge Cluster APOgee Survey V. Elemental abundances of the bulge globular cluster HP 1
• The $Hubble$ Missing Globular Cluster Survey. I. Survey overview and the first precise age estimate for ESO452-11 and 2MASS-GC01
• Dynamical mirages: how bar-induced resonant trapping can mimic substructure clustering in dynamical parameter spaces
• Investigating Phosphorus Abundances in a Sample of APOGEE-2 Bulge Globular Clusters
• CAPOS: The bulge Cluster APOgee Survey VIII. Final ASPCAP results for all clusters
• Globular clusters in \textsc{OrbIT}: complete dynamical characterisation of the globular cluster population of the Milky Way through updated orbital reconstruction
• CAPOS: The bulge Cluster APOgee Survey VII. First detailed chemical analysis of NGC 6316
• Revisited parameters for the twin bulge globular clusters NGC 6528 and NGC 6553
• The Spheroidal Bulge of the Milky Way: Chemodynamically Distinct from the Inner-Thick Disc and Bar
• Chemical enrichment in LINERs from MaNGA. I. Tracing Oxygen and Nitrogen Nuclear Abundances in LINERs with Varied Ionizing Sources