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We present the results from a wide-field imaging study of globular cluster (GC) systems in three early-type galaxies. Combinations of Subaru/Suprime-Cam, CFHT/MegaCam and HST/WFPC2/ACS data were used to determine the GC system properties of…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-17 Sreeja S. Kartha , Duncan A. Forbes , Lee R. Spitler , Aaron J. Romanowsky , Jacob A. Arnold , Jean P. Brodie

We measure the half-light radii of globular clusters (GCs) in 43 galaxies from the ACS Fornax Cluster Survey (ACSFCS). We use these data to extend previous work in which the environmental dependencies of the half-light radii of GCs in early…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 Karen L. Masters , Andres Jordan , Patrick Cote , Laura Ferrarese , John P. Blakeslee , Leopolde Infante , Eric Peng , Simona Mei , Michael J. West

Globular clusters (GCs) are excellent tracers of their host galaxies' evolutionary histories. Traditional methods for identifying GCs in galaxies rely on cuts over photometric catalogs and can yield source lists with high levels of…

We have investigated a number of globular cluster candidates from a recent wide-field study by Harris et al. (2004a) of the giant elliptical galaxy NGC 5128. We used the Magellan I telescope + MagIC camera under excellent seeing (0.3"-0.6")…

Astrophysics · Physics 2009-11-11 M. Gomez , D. Geisler , W. E. Harris , T. Richtler , G. L. H. Harris , K. Woodley

We present a study of the spatial and color distributions of four early-type galaxies and their globular cluster (GC) systems observed as part of our ongoing wide-field imaging survey. We use $BVR$ KPNO-4m+MOSAIC imaging data to…

Astrophysics of Galaxies · Physics 2015-06-22 Jonathan R. Hargis , Katherine L. Rhode

Globular clusters (GCs) are evolved stellar systems containing entire populations of millisecond pulsars (MSPs), which are efficient gamma-ray emitters. Observations of this emission can be used as a powerful tool to explore the dynamical…

High Energy Astrophysical Phenomena · Physics 2019-04-10 Raniere de Menezes , Fabio Cafardo , Rodrigo Nemmen

Obtain time-series photometry of the very crowded central regions of Galactic globular clusters with better angular resolution than previously achieved with conventional CCDs on ground-based telescopes to complete, or improve, the census of…

Compact stellar systems such as Ultra-compact dwarfs (UCDs) and Globular Clusters (GCs) around galaxies are known to be the tracers of the merger events that have been forming these galaxies. Therefore, identifying such systems allows to…

Astrophysics of Galaxies · Physics 2022-01-10 Mohammad Mohammadi , Jarvin Mutatiina , Teymoor Saifollahi , Kerstin Bunte

We homogeneously measured the elliptical shapes of 163 globular clusters (GCs) using the on-sky distribution of their cluster members and the third data release of the ESA mission Gaia (DR3). The astrometry enables the differentiation of…

Astrophysics of Galaxies · Physics 2024-08-02 Mauricio Cruz Reyes , Richard I. Anderson

As ancient star clusters, globular clusters (GCs) are regarded as powerful tracers of galaxy evolution and assembly. Due to their brightness and compact sizes, GCs are employed to probe the kinematics and stellar population properties of…

We present a study of the properties of the star-cluster systems around pseudo-bulges of late-type spiral galaxies using a sample of 11 galaxies with distances from 17 to 37 Mpc. Star clusters are identified from multiband HST ACS and WFPC2…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 Daiana Di Nino , Michele Trenti , Massimo Stiavelli , C. Marcella Carollo , Claudia Scarlata , Rosemary F. G. Wyse

We present a photometric analysis of globular clusters (GCs) in the massive galaxy cluster MACS J0416.1-2403 (z = 0.397) using deep JWST/NIRCam imaging from the PEARLS program. PSF photometry was performed in the short wavelength filters…

This paper supplements Jiang et al. (2003), who studied 172 M31 globular clusters (GCs) and globular cluster candidates from Battistini et al. (1987) on the basis of integrated photometric measurements in the…

Cosmology and Nongalactic Astrophysics · Physics 2009-11-13 Jun Ma , Zhou Fan , Richard de Grijs , Zhenyu Wu , Xu Zhou , Jianghua Wu

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…

Evolution of the mass function (MF) and radial distribution (RD) of the Galactic globular cluster (GC) system is calculated using an advanced and a realistic Fokker-Planck (FP) model that considers dynamical friction, disc/bulge shocks and…

Astrophysics · Physics 2009-11-13 Jihye Shin , Sungsoo S. Kim , Koji Takahashi

I briefly introduce a database of models that describe the evolution of star clusters in several broad-band photometric systems. Models are based on the latest Padova stellar evolutionary tracks - now including the alpha-enhanced case and…

Astrophysics · Physics 2007-05-23 Leo Girardi

We present the results of the analysis of deep photometric data of 32 Galactic globular clusters. We analysed 69 parallel field images observed with the Wide Field Channel of the Advanced Camera for Surveys of the Hubble Space Telescope…

Astrophysics of Galaxies · Physics 2020-04-22 H. Ebrahimi , A. Sollima , H. Haghi , H. Baumgardt , M. Hilker

Ultraviolet observations are the best tool to study hot stellar populations which emit most of their light at short wavelengths. As part of a large project devoted to the characterization of the UV properties of Galactic globular clusters…

Solar and Stellar Astrophysics · Physics 2015-06-18 E. P. Lagioia , E. Dalessandro , F. R. Ferraro , B. Lanzoni , M. Salaris

We use Hubble Space Telescope archival images to measure central surface brightness profiles of globular clusters around satellite galaxies of the Milky Way. We report results for 21 clusters around the LMC, 5 around the SMC, and 4 around…

Astrophysics · Physics 2009-06-23 Eva Noyola , Karl Gebhardt

The observational properties of globular cluster systems (GCSs) are vital tools to investigate the violent star formation histories of their host galaxies. This violence is thought to have been triggered by galaxy interactions or mergers.…

Astrophysics · Physics 2008-11-26 Peter Anders , Uta Fritze - v. Alvensleben , Richard de Grijs