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A homogeneous sample of galaxy redshifts in the core regions (R < 0.5 h$^{-1}$ Mpc) of 12 clusters is used to measure the frequency of substructure with different tests. In 50 % of the cases substructure is detected, a frequency which…

Astrophysics · Physics 2007-05-23 P. Stein

We present an investigation of the globular cluster (GC) systems of NGC 3607 and NGC 3608 as part of the ongoing SLUGGS survey. We use wide-field imaging data from the Subaru telescope in the g, r, and i filters to analyse the radial…

The bimodal globular cluster (GC) metallicity distributions of many giant elliptical galaxies are often cited as evidence for the formation of such galaxies through mergers involving gas-rich spirals. In such models, the metal- rich GCs are…

Astrophysics · Physics 2011-02-11 Patrick Cote , Ronald O. Marzke , Michael J. West

We present Lick line-index measurements of extragalactic globular clusters in seven early-type galaxies (NGC 1380, 2434, 3115, 3379, 3585, 5846, and 7192) with different morphological types (E-S0) located in field and group/cluster…

We present new Hubble Space Telescope imaging of the outer regions of M87 in order to study its globular cluster (GC) population out to large galactocentric distances. We discuss particularly the relationship between GC effective radii…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-17 Jeremy J. Webb , Alison Sills , William E. Harris

Prompted by a new catalogue of M31 globular clusters, we have collected together individual metallicity values for globular clusters in the Local Group. Although we briefly describe the globular cluster systems of the individual Local Group…

Astrophysics · Physics 2007-05-23 Duncan A. Forbes , Karen L. Masters , Dante Minniti , Pauline Barmby

We report the discovery of significant localized structures in the projected two-dimensional (2D) spatial distributions of the Globular Cluster (GC) systems of the ten brightest galaxies in the Virgo Cluster. We use catalogs of GCs…

Astrophysics of Galaxies · Physics 2015-05-27 R. D'Abrusco , G. Fabbiano , A. Zezas

We study the globular cluster (GC) populations of 21 giant elliptical galaxies in 19 Abell clusters. This method, applied here primarily in the R band, is based on the surface brightness fluctuations technique of extragalactic distance…

Astrophysics · Physics 2009-10-30 John P. Blakeslee , John L. Tonry , Mark R. Metzger

We present a photometric study of the prototype merger remnant NGC 3610 and its globular cluster (GC) system, based on new GEMINI/GMOS and ACS/HST archival images. Thanks to the large FOV of our GMOS data, larger than previous studies, we…

Astrophysics of Galaxies · Physics 2017-01-10 Lilia P. Bassino , Juan P. Caso

We present an analysis of compact star clusters in deep HST/WFPC2 images of NGC 1275. B and R band photometry of roughly 3000 clusters shows a bimodality in the B-R colors, suggesting that distinct old and young cluster populations are…

The merger remnant NGC 1316 (Fornax A) is one of the most important objects regarding the investigation of merger-related processes. We use kinematical data of globular clusters (GCs) and the diffuse stellar light to investigate the global…

Astrophysics of Galaxies · Physics 2014-09-17 Tom Richtler , Michael Hilker , Brijesh Kumar , Lilia P. Bassino , Matias Gomez , Boris Dirsch

Globular clusters show abundance variations for light elements that are not yet well understood. The preferred explanation involves a self-enrichment scenario, with two subsequent generations of stars. Observations of main sequence stars…

Astrophysics of Galaxies · Physics 2015-05-19 E. Pancino , M. Rejkuba , M. Zoccali , R. Carrera

The global properties of all known Galactic globular clusters are examined. The relationship between the luminosities and the metallicities of Galactic globular clusters is found to be complex. Among luminous clusters there is a correlation…

Astrophysics of Galaxies · Physics 2015-05-30 Sidney van den Bergh

The Advanced Camera for Surveys on board the Hubble Space Telescope has been used to obtain deep high-resolution images of the giant early-type galaxy NGC 1316 which is an obvious merger remnant. These observations supersede previous,…

Astrophysics · Physics 2009-11-10 Paul Goudfrooij , Diane Gilmore , Bradley C. Whitmore , Francois Schweizer

We have discovered three globular clusters beyond the Holmberg radius in Hubble Space Telescope Advanced Camera for Surveys images of the gas-rich dark matter dominated blue compact dwarf galaxy NGC2915. The clusters, all of which start to…

Slit spectra, covering the rest frame near-ultraviolet and blue wavelength regions, are combined with moderately deep g and R images to investigate radial population gradients in the brightest components of six z=0.2 galaxy clusters…

Astrophysics · Physics 2016-08-30 T. J. Davidge , M. Grinder

High signal-to-noise, low-resolution spectra have been obtained for 22 globular clusters (GCs) in NGC 4365. Some of these were selected as probable representatives of an intermediate-age (2-5 Gyr), extremely metal-rich GC subpopulation. The…

In this work we perform the photometric analysis of the globular cluster system (GCS) of the giant elliptical NGC4696, which is the brightest member of Centaurus, a rich and dynamically young galaxy cluster. We obtained deep Magellan 6.5…

Astrophysics of Galaxies · Physics 2024-09-25 S. Federle , M. Gómez , S. Mieske , W. E. Harris , M. Hilker , I. A. Yegorova , G. L. H. Harris

We use high-precision photometry of red-giant-branch (RGB) stars in 57 Galactic globular clusters (GCs), mostly from the `Hubble Space Telescope (HST) UV Legacy Survey of Galactic globular clusters', to identify and characterize their…

Aims.We study the photometric and structural properties of the star cluster system in the late type Sc spiral NGC 3370. Methods. BVI observations from the Advanced Camera for Surveys on board of HST are used to analyse in detail the…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-13 Michele Cantiello , Enzo Brocato , John P. Blakeslee
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