Search for globular clusters associated with the Milky Way dwarf galaxies using Gaia DR2

Abstract

We report the result of searching for globular clusters (GCs) around 55 Milky Way satellite dwarf galaxies within the distance of 450 kpc from the Galactic Center except for the Large and Small Magellanic Clouds and the Sagittarius dwarf. For each dwarf, we analyze the stellar distribution of sources in Gaia DR2, selected by magnitude, proper motion, and source morphology. Using the kernel density estimation of stellar number counts, we identify eleven possible GC candidates. Crossed-matched with existing imaging data, all eleven objects are known either GCs or galaxies and only Fornax GC 1-6 among them are associated with the targeted dwarf galaxy. Using simulated GCs, we calculate the GC detection limit $M_{\mathrm{V}}^{\lim }$ that spans the range from $M_{\mathrm{V}}^{\lim }\sim -7$ for distant dwarfs to $M_{\mathrm{V}}^{\lim }\sim 0$ for nearby systems. Assuming a Gaussian GC luminosity function, we compute that the completeness of the GC search is above 90 percent for most dwarf galaxies. We construct the 90 percent credible intervals/upper limits on the GC specific frequency $S_{\mathrm{N}}$ of the MW dwarf galaxies: $12<S_{\mathrm{N}}<47$ for Fornax, $S_{\mathrm{N}}<20$ for the dwarfs with $-12<M_{\mathrm{V}}<-10$, $S_{\mathrm{N}}<30$ for the dwarfs with $-10<M_{\mathrm{V}}<-7$, and $S_{\mathrm{N}}<90$ for the dwarfs with $M_{\mathrm{V}}>-7$. Based on $S_{\mathrm{N}}$, we derive the probability of galaxies hosting GCs given their luminosity, finding that the probability of galaxies fainter than $M_{\mathrm{V}}=-9$ to host GCs is lower than 0.1.

References in corpus (66)

• Astropy: A Community Python Package for Astronomy
• The NumPy array: a structure for efficient numerical computation
• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• The SIMBAD astronomical database
• The observed properties of dwarf galaxies in and around the Local Group
• Extragalactic Globular Clusters and Galaxy Formation
• Resolved Massive Star Clusters in the Milky Way and its Satellites: Brightness Profiles and a Catalogue of Fundamental Parameters
• Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
• Gaia Data Release 2: Catalogue validation
• Beasts of the Southern Wild: Discovery of nine Ultra Faint satellites in the vicinity of the Magellanic Clouds
• Eight Ultra-faint Galaxy Candidates Discovered in Year Two of the Dark Energy Survey
• The Dark Energy Survey Data Release 1
• 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
• On the Origin of Globular Cluster Systems in Elliptical and cD Galaxies
• Gaia Data Release 1: Catalogue validation
• The formation and assembly history of the Milky Way revealed by its globular cluster population
• The Luminosity Function of the Milky Way Satellites
• The ACS Virgo Cluster Survey XV. The Formation Efficiencies of Globular Clusters in Early-Type Galaxies: The Effects of Mass and Environment
• The initial mass function : from Salpeter 1955 to 2005
• The ACS Virgo Cluster Survey. XII. The Luminosity Function of Globular Clusters in Early Type Galaxies
• Velocity Dispersion Profiles of Seven Dwarf Spheroidal Galaxies
• Surface Brightness Profiles and Structural Parameters for 53 Rich Stellar Clusters in the Large Magellanic Cloud
• Proper motions and dynamics of the Milky Way globular cluster system from Gaia DR2
• What is a globular cluster? An observational perspective
• Gaia DR2 Proper Motions of Dwarf Galaxies within 420 kpc: Orbits, Milky Way Mass, Tidal Influences, Planar Alignments, and Group Infall
• The feeble giant. Discovery of a large and diffuse Milky Way dwarf galaxy in the constellation of Crater
• Comparing the properties of local globular cluster systems: implications for the formation of the Galactic halo
• The hidden giant: discovery of an enormous Galactic dwarf satellite in Gaia DR2
• Building up the globular cluster system of the Milky Way. The contribution of the Sagittarius galaxy
• The Invisibles: A Detection Algorithm to Trace the Faintest Milky Way Satellites
• The ACS Fornax Cluster Survey. VIII. The Luminosity Function of Globular Clusters in Virgo and Fornax Early-Type Galaxies and its Use as a Distance Indicator
• Globular Cluster Systems in Nearby Dwarf Galaxies: III. Formation Efficiencies of Old Globular Clusters
• The formation and hierarchical assembly of globular cluster populations
• The Metallicity Distribution in the Halo Stars of NGC 5128: Implications for Galaxy Formation
• Gaia Proper Motions and Orbits of the Ultra-Faint Milky Way Satellites
• Surface Brightness Profiles and Structural Parameters for Globular Clusters in the Fornax and Sagittarius Dwarf Spheroidal Galaxies
• The Next Generation Virgo Cluster Survey. XXIII. Fundamentals of nuclear star clusters over seven decades in galaxy mass
• Extending the Globular Cluster System-Halo Mass Relation to the Lowest Galaxy Masses
• Discovery of two neighboring satellites in the Carina constellation with MagLiteS
• Surface Brightness Profiles and Structural Parameters for 10 Rich Stellar Clusters in the Small Magellanic Cloud
• Deep imaging of Eridanus II and its lone star cluster
• At the survey limits: discovery of the Aquarius 2 dwarf galaxy in the VST ATLAS and the SDSS data
• A New Catalog of Globular Clusters in the Milky Way
• Self-consistent proto-globular cluster formation in cosmological simulations of high-redshift galaxies
• Proper motions of Milky Way Ultra-Faint satellites with $Gaia$ DR2 $\times$ DES DR1
• A New Milky Way Satellite Discovered In The Subaru/Hyper Suprime-Cam Survey
• Searches for New Milky Way Satellites from the First Two Years of Data of the Subaru/Hyper Suprime-Cam Survey: Discovery of Cetus~III
• A single population of red globular clusters around the massive compact galaxy NGC 1277
• Formation histories of stars, clusters and globular clusters in the E-MOSAICS simulations
• Automated search for galactic star clusters in large multiband surveys: I. Discovery of 15 new open clusters in the Galactic anticenter region
• Gaia 1 and 2. A pair of new Galactic star clusters
• The Globular Cluster Luminosity Function: New Progress in Understanding an Old Distance Indicator
• A universal route for the formation of massive star clusters in giant molecular clouds
• The Little Engines That Could? Globular Clusters Contribute Significantly to Reionization-era Star Formation
• Hierarchical progressive surveys. Multi-resolution HEALPix data structures for astronomical images, catalogues, and 3-dimensional data cubes
• Nine tiny star clusters in Gaia DR1, PS1 and DES
• With and without spectroscopy: Gaia DR2 proper motions of seven Ultra-Faint Dwarf Galaxies
• Simulating Star Clusters Across Cosmic Time: II. Escape Fraction of Ionizing Photons from Molecular Clouds
• Formation of Globular Cluster Systems II: Impact of the Cutoff of the Cluster Initial Mass Function
• Simulating the UV Escape Fractions from Molecular Cloud Populations in Star-forming Dwarf and Spiral Galaxies
• The Globular Cluster System of NGC 6822
• Rediscovery of the Sixth Star Cluster in the Fornax Dwarf Spheroidal Galaxy
• Globular Clusters in Dwarf Galaxies
• Evidence That Hydra I is a Tidally Disrupting Milky Way Dwarf Galaxy

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