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Thin stellar streams originating from globular clusters are among the most sensitive tracers of low-mass dark-matter subhalos. Joint analysis of the entire population of stellar streams will place the most robust constraints on the…

Astrophysics of Galaxies · Physics 2024-10-08 Sarah Pearson , Ana Bonaca , Yingtian Chen , Oleg Y. Gnedin

We use Hubble Space Telescope (HST) imaging from the ACS Treasury Survey to determine fits for single population isochrones of 69 Galactic globular clusters. Using robust Bayesian analysis techniques, we simultaneously determine ages,…

Solar and Stellar Astrophysics · Physics 2017-03-03 R. Wagner-Kaiser , A. Sarajedini , T. von Hippel , D. C. Stenning , D. A. van Dyk , E. Jeffery , E. Robinson , N. Stein , J. Anderson , W. H. Jefferys

In this study, we search for Globular Clusters (GCs) in the inner halo of the Circinus galaxy using a combination of observational data. Our dataset includes observations from the VISTA Variables in the V\'ia L\'actea Extended Survey…

Astrophysics of Galaxies · Physics 2024-03-06 C. O. Obasi , M. Gomez , D. Minniti , L. D. Baravalle , M. V. Alonso , B. I. Okere

We present a second set of results from a wide-field photometric survey of the environs of Milky Way globular clusters. The clusters studied are NGC 1261, NGC 1851 and NGC 5824: all have data from DECam on the Blanco 4m telescope. NGC 5824…

Astrophysics of Galaxies · Physics 2017-11-29 P. B. Kuzma , G. S. Da Costa , A. D. Mackey

We present the discovery of four remote star clusters in M33, one of which is of an extended nature. Three of the clusters were discovered using survey data from the Isaac Newton Telescope Wide-Field Camera while one was discovered…

Cosmology and Nongalactic Astrophysics · Physics 2011-02-11 A. Huxor , A. M. N. Ferguson , M. K. Barker , N. R. Tanvir , M. J. Irwin , S. C. Chapman , R. Ibata , G. Lewis

We use CTIO 4-m Mosaic II images taken with the Washington $CM$ and Harris $R$ filters to identify candidate globular clusters in the six major galaxies of the Sculptor group: NGC 45, NGC 55, NGC 247, NGC 254, NGC 300, and NGC 7793. From…

Astrophysics · Physics 2009-11-10 K. A. G. Olsen , B. W. Miller , N. B. Suntzeff , R. A. Schommer , J. Bright

CONTEXT: Extragalactic globular clusters have been studied in elliptical galaxies and in a few luminous spiral galaxies, but little is known about globular clusters in low-luminosity spirals. AIMS: Past observations with the ACS have shown…

Astrophysics · Physics 2009-11-13 Marcelo D. Mora , Soeren S. Larsen , Markus Kissler-Patig

We present the results of a wide-field photometric study of the globular cluster (GC) system of the edge-on Sab spiral NGC7814. This is the first spiral to be fully analyzed from our survey of the GC systems of a large sample of galaxies…

Astrophysics · Physics 2009-11-10 K. L. Rhode , S. E. Zepf

This paper is part of a project to search the inner Milky Way for hidden massive clusters and to address the question of whether our Galaxy still forms clusters similar to the progenitors of the present-day globular clusters. We report high…

Astrophysics · Physics 2009-11-10 J. Borissova , V. D. Ivanov , D. Minniti , D. Geisler , A. W. Stephens

We have obtained deep photometry of NGC 1199 (in HCG 22) and NGC 6868 (in the Telescopium group). Both galaxies are the optically brightest galaxies of their groups. Our analysis of B and R images taken with the Keck II and the VLT/ESO…

Astrophysics · Physics 2009-11-06 C. Da Rocha , C. Mendes de Oliveira , M. Bolte , B. L. Ziegler , T. H. Puzia

We report on the discovery of an extended stellar halo surrounding the distant Galactic globular cluster NGC 5694, based on new deep (V ~ 24.5) wide-field (24' * 20') photometry acquired with VIMOS at VLT. Stars with colour and magnitude…

Solar and Stellar Astrophysics · Physics 2015-05-28 M. Correnti , M. Bellazzini , E. Dalessandro , A. Mucciarelli , L. Monaco , M. Catelan

We report the first results from deep ACS imaging of ten classical globular clusters in the far outer regions (15 < R_p < 100 kpc) of M31. Eight of the clusters, including two of the most remote M31 globular clusters presently known, are…

This paper presents results from wide-field imaging of the globular cluster (GC) systems of five intermediate-luminosity (M_V ~-21 to -22) early-type galaxies. The aim is to accurately quantify the global properties of the GC systems by…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-11 Jonathan R. Hargis , Katherine L. Rhode

We present the results of a photometric and spectroscopic survey of the globular cluster system of NGC 5128 (Centaurus A), a galaxy whose proximity makes it an important target for early-type galaxy studies. We imaged three fields in UBVRI…

Astrophysics · Physics 2009-11-10 Eric W. Peng , Holland C. Ford , Kenneth C. Freeman

We report the discovery of 4 candidate intracluster globular clusters (IGCs) in a single deep HST ACS field of the Virgo Cluster. We show that each cluster is roughly spherical, has a magnitude near the peak of the Virgo globular cluster…

We here present the luminosity function (LF) of globular clusters (GCs) in five nearby spiral galaxies using the samples of GC candidates selected in Hubble Space Telescope mosaic images in F435W, F555W and F814W filters. Our search, which…

Astrophysics of Galaxies · Physics 2021-10-20 Luis Lomelí-Núñez , Y. D. Mayya , L. H. Rodríguez-Merino , P. A. Ovando , D. Rosa-González

The ACS Survey of Galactic Globular Clusters is a Hubble Space Telescope (HST) Treasury program designed to provide a new large, deep and homogeneous photometric database. Based on observations from this program, we have measured precise…

We present the first measurement of the globular cluster populations of galaxies in Hickson compact groups, in order to investigate the effect of these high density environments on the formation and evolution of globular cluster systems.…

Astrophysics · Physics 2009-11-06 Wayne A. Barkhouse , Michael J. West , Gregory D. Bothun

We present a new catalog of 40502 globular cluster (GC) candidates in NGC 5128 out to a projected radius of $\sim$150 kpc, based on data from the Panoramic Imaging Survey of Centaurus and Sculptor (PISCeS), Gaia Data Release 2, and the NOAO…

Updated data of the 153 Galactic globular clusters are used to readdress fundamental parameters of the Milky Way. We build a reduced sample, decontaminated of the clusters younger than 10Gyr, those with retrograde orbits and/or evidence of…

Astrophysics · Physics 2011-03-28 Eduardo Bica , Charles Bonatto , Beatriz Barbuy , Sergio Ortolani