The ACS Survey of Galactic Globular Clusters. I. Overview and Clusters Without Previous HST Photometry

Abstract

We present the first results of a large ACS Survey of Galactic globular clusters. This Hubble Space Telescope (HST) Treasury project is designed to obtain photometry with S/N > ~10 for main sequence stars with masses > ~0.2Msun in a sample of globulars using the Advanced Camera for Surveys (ACS) Wide Field Channel. Here we focus on clusters without previous HST imaging data. These include NGC 5466, 6779, 5053, 6144, Palomar 2, E 3, Lynga 7, Palomar 1, and NGC 6366. Our CMDs extend reliably from the horizontal branch to as much as seven magnitudes fainter than the main sequence turnoff and represent the deepest CMDs published to-date for these clusters. Using fiducial sequences for three standard clusters (M92, NGC 6752, and 47 Tuc) with well-known metallicities and distances, we perform main sequence fitting on the target clusters in order to obtain estimates of their distances and reddenings. These comparisons along with fitting the cluster main sequences to theoretical isochrones yield ages for the target clusters. We find that the majority of the clusters have ages that are consistent with the standard clusters at their metallicities. The exceptions are E 3 which appears ~2 Gyr younger than 47 Tuc, and Pal 1, which could be as much as 8 Gyr younger than 47 Tuc.

22 pages, 29 figures, accepted for publication in The Astronomical Journal, April 2007. High resolution version available at http://www.astro.ufl.edu/~ata/GC_Treasury/Web_Page/publications.html

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• Color-Magnitude Diagram Constraints on the Metallicities, Ages, and Star Formation History of the Stellar Populations in the Carina Dwarf Spheroidal Galaxy
• UVIT-HST-GAIA view of NGC 288: A census of hot stellar population and their properties from UV
• A Deep View into the Nucleus of the Sagittarius Dwarf Spheroidal Galaxy with MUSE. III. Discrete multi-component population-dynamical models based on the Jeans equations
• Multiband Probabilistic Cataloging: A Joint Fitting Approach to Point Source Detection and Deblending
• Rubin Observatory LSST Stars Milky Way and Local Volume Star Clusters Roadmap
• Photometry and astrometry with JWST -- II. NIRCam distortion correction
• Chemical Abundances of Globular Clusters in NGC 5128 (Centaurus A)
• A search for black hole microlensing signatures in globular cluster NGC 6656 (M 22)
• A stellar census in globular clusters with MUSE. A new perspective on the multiple main sequences of $\omega$ Centauri
• Ghosts of Milky Way's past: the globular cluster ESO 37-1 (E 3)
• Nuclei of dwarf spheroidal galaxies KKs3 and ESO269-66 and their counterparts in our Galaxy
• The ages of (the oldest) stars
• Euclid: Early Release Observations -- Unveiling the morphology of two Milky Way globular clusters out to their periphery
• The Kinematics of 30 Milky Way Globular Clusters and the Multiple Stellar Populations within
• Ultra-deep ATCA imaging of 47 Tucanae reveals a central compact radio source
• Integrated photometry of multiple stellar populations in Globular Clusters
• Blue Straggler Star Populations in Globular Clusters: I. Dynamical Properties of Blue Straggler Stars in NGC 3201, NGC 6218 and $\omega$ Centauri
• The M4 Core Project with HST --- I. Overview and First-Epoch
• High Resolution Spectroscopic Abundances of Red Giant Branch Stars in NGC 6681
• An HST/WFPC2 survey of bright young clusters in M31. IV. Ages and mass estimates
• Binary Frequencies in a Sample of Globular Clusters. I. Methodology and Initial Results
• X-ray and Optical Study of Low Core Density Globular Clusters NGC6144 and E3
• On the use of the main sequence knee (saddle) to measure globular cluster ages
• Chemical analysis of eight giant stars of the globular cluster NGC 6366
• Chemical Abundances in the Globular Clusters NGC 6229 and NGC 6779
• Dynamical estimate of post main sequence stellar masses in 47 Tucanae
• SHOTGLAS II. MUSE spectroscopy of blue horizontal branch stars in the core of $\omega$ Centauri and NGC 6752
• Binary properties of the globular cluster 47 Tuc (NGC 104). A dearth of short-period binaries
• Models of Metal-Poor Stars with Different Initial Abundances of C, N, O, Mg, and Si. I. Bolometric Corrections Derived from New MARCS Synthetic Spectra and Their Implications for Observed Colour-Magnitude Diagrams
• Optimal stellar photometry for multi-conjugate adaptive optics systems using science-based metrics
• Impact of distance determinations on Galactic structure. II. Old tracers
• Major Substructure in the M31 Outer Halo: the East Cloud
• Central kinematics of the Galactic globular cluster M80
• Identifications of Faint Chandra Sources in the Globular Cluster M3
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. XIII. ACS/WFC Parallel-Field Catalogues
• Galaxy archaeology for wet mergers: Globular cluster age distributions in the Milky Way and nearby galaxies
• Validation of optimised population synthesis through mock spectra and Galactic globular clusters
• Globular clusters hosting intermediate-mass black-holes: no mass-segregation based candidates
• Stellar collisions in globular clusters: the origin of multiple stellar populations
• Observations of the Ultraviolet-Bright Star Barnard 29 in the Globular Cluster M13 (NGC 6205)
• Stellar-Encounter Driven Red-Giant Star Mass-Loss in Globular Clusters
• X-ray Clusters of Galaxies as Cosmological Tools
• The Peculiar Globular Cluster Palomar 1 and Persistence in the SDSS-APOGEE Database
• Hubble Space Telescope imaging of the extremely metal-poor globular cluster EXT8 in Messier 31
• The VMC Survey. XVIII. Radial dependence of the low-mass, 0.55--0.82 $M_{\odot }$ stellar mass function in the Galactic globular cluster 47 Tucanae
• Red Giant Branch Bump Star Counts in Data and Stellar Models
• Identifying Contaminated K-band Globular Cluster RR Lyrae Photometry
• Bayesian Analysis of Two Stellar Populations in Galactic Globular Clusters II: NGC 5024, NGC 5272, and NGC 6352
• Blue Straggler Stars in Globular Clusters: a powerful tool to probe the internal dynamical evolution of stellar systems
• Towards Realistic Modeling of the Astrometric Capabilities of MCAO Systems: Detecting an Intermediate Mass Black Hole with MAVIS
• Stellar collisions in globular clusters: Constraints on the initial mass function of the first generation of stars
• Ultraviolet Imaging Telescope (UVIT) observation of the Galactic Globular Cluster NGC 7492
• MUSE narrow field mode observations of the central kinematics of M15
• The $Hubble$ Missing Globular Cluster Survey. I. Survey overview and the first precise age estimate for ESO452-11 and 2MASS-GC01
• The temperature distribution of horizontal branch stars: methods and first results
• Towards 21st Century Stellar Models: Star Clusters, Supercomputing, and Asteroseismology
• A stellar census in globular clusters with MUSE. Metallicity spread and dispersion among first-population stars
• Models for Metal-Poor Stars with Different Initial Abundances of C, N, O, Mg, and Si. III. Grids of Isochrones for $-2.5\le$ [Fe/H] $\le -0.5$ and Helium Abundances $Y=0.25$ and $0.29$ at Each Metallicity
• Successful application of PSF-R techniques to the case of the globular cluster NGC6121 (M4)
• Modelling of integrated-light spectra from the optical to the near-infrared: the globular cluster G280 in M31
• The Bottom-Light Present Day Mass Function of the Peculiar Globular Cluster NGC 6535
• Milky Way Globular Cluster Metallicity and Low-Mass X-ray Binaries: The Red Giant Influence
• Inferring the Helium abundance of extragalactic Globular Clusters using Integrated Spectra
• To Grow Old and Peculiar: A Survey of Anomalous Variable Stars in M80 and Age Determination using K2 and Gaia
• Analysis of integrated-light spectra of Galactic globular clusters
• 2MASS photometry and age estimate of globular clusters in the outer halo of M31
• Lifting the dust veil from the Globular Cluster Palomar2
• Optimal Differential Astrometry for Multiconjugate Adaptive Optics. I. Astrometric Distortion Mapping using On-sky GeMS Observations of NGC 6723
• Using the Agile software development lifecycle to develop a standalone application for generating colour magnitude diagrams
• Signature of a chemical spread in the open cluster M37
• A Differential RR Lyrae Line-of-Sight Distance Between M31 and M33
• The GeMS/GSAOI Galactic Globular Cluster Survey (G4CS) II: Characterization of 47 Tuc with Bayesian Statistics
• Direct N-body simulations of NGC 6397 and its tidal tails
• Studying Binary Systems in Omega Centauri with MUSE. I. Detection of Spectroscopic Binaries
• Spectroscopy of Red Giants in the globular cluster Terzan 8: kinematics and evidence for the surrounding Sagittarius stream
• A Multi-Wavelength Study of the Segue 3 Cluster
• Blue Stragglers in Globular Clusters: Observations, Statistics and Physics
• CAPOS: The bulge Cluster APOgee Survey VII. First detailed chemical analysis of NGC 6316
• The ACS survey of globular clusters. XIII. Photometric calibration in comparison with Stetson standards
• Exploring Multiple Stellar Populations in Globular Clusters with Euclid: A Theoretical Overview and Insights from NGC 6397
• Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud: III. Horizontal Branch Morphology
• Asymptotic Giant Branch Variables as Extragalactic Distance Indicators
• A Wide View of the Galactic Globular Cluster NGC 2808: Red Giant and Horizontal Branch Star Spatial Distributions
• Properties of Globular Clusters in Galaxy Clusters: Sensitivity from the Formation and Evolution of Globular Clusters
• The broadening of the main sequence in the open cluster M38
• Evidence for Photometric Contamination in Key Observations of Cepheids in the Benchmark Galaxy IC 1613
• RR Lyrae stars in the globular cluster Palomar 2
• Proper Motions and Internal Dynamics in the Core of the Globular Cluster M71
• Identification and characterization of optical companions to the population of millisecond pulsars in the globular cluster M3
• New variable stars in NGC 6652 and its background Sagittarius stream
• Age and chemical composition of the globular cluster NGC 6652
• He-enriched STAREVOL models for globular cluster multiple populations. Self-consistent isochrones from ZAMS to the TP-AGB phase
• Testing QUMOND theory with Galactic globular clusters in a weak external field
• The CUBES Science Case
• Horizontal branch structure, age, and chemical composition for very metal-poor extragalactic globular clusters
• The Two-infall Model Revisited: Constraints on Milky Way Bulge Assembly from >30,000 Galactic Chemical Evolution Models and Machine Learning
• Medium resolution spectroscopy and chemical composition of Galactic globular clusters
• Chemical composition and ages of four globular clusters in M31 from the analysis of their integrated-light spectra
• Radial Distribution of Blue Stragglers in NGC 5466 using AstroSat
• Globular Cluster Abundances and What They Can Tell Us About Galaxy Formation
• Gravitational Microlensing Rates in Milky Way Globular Clusters
• Discovery of a double white dwarf in the Galactic globular cluster NGC 6397