scholarly journals The Outer Halo Cluster System of NGC 1399

2002 ◽  
Vol 207 ◽  
pp. 324-326 ◽  
Author(s):  
B. Dirsch ◽  
D. Geisler ◽  
T. Richtler ◽  
J.C. Forte
Keyword(s):  
Globular Cluster ◽  
Cluster System ◽  
Wide Field ◽  
Ccd Photometry ◽  
The Galaxy ◽  
Specific Frequency ◽  
Field Imaging ◽  
Wide Field Imaging

We investigate the outer halo globular cluster population of NGC 1399. This study uses wide-field imaging of this cluster system, which covers the largest area studied with CCD photometry until now. The cluster system of NGC 1399 is found to extend further than 100 kpc from the galaxy. A population of metal-rich, as well as metal-poor clusters has been identified at these large radii. At radii smaller than 55 kpc the specific frequency of the red cluster system remains constant, while that of the blue clusters increases proportional tor0.8±0.2. For larger radii, the uncertainty of the galaxy light profile does not permit any reliable statement.

scholarly journals The SLUGGS Survey: wide field imaging of the globular cluster system of NGC 4278

2013 ◽  
Vol 436 (2) ◽  
pp. 1172-1190 ◽  
Author(s):  
Christopher Usher ◽  
Duncan A. Forbes ◽  
Lee R. Spitler ◽  
Jean P. Brodie ◽  
Aaron J. Romanowsky ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Cluster System ◽  
Wide Field ◽  
Globular Cluster System ◽  
Field Imaging ◽  
Wide Field Imaging

scholarly journals Erratum: The SLUGGS Survey: the globular cluster systems of three early-type galaxies using wide-field imaging

2016 ◽  
Vol 457 (2) ◽  
pp. 1702-1702 ◽  
Author(s):  
Sreeja S. Kartha ◽  
Duncan A. Forbes ◽  
Lee R. Spitler ◽  
Aaron J. Romanowsky ◽  
Jacob A. Arnold ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Wide Field ◽  
Early Type ◽  
Cluster Systems ◽  
Field Imaging ◽  
Wide Field Imaging

scholarly journals The SLUGGS survey★: the globular cluster systems of three early-type galaxies using wide-field imaging

2013 ◽  
Vol 437 (1) ◽  
pp. 273-292 ◽  
Author(s):  
Sreeja S. Kartha ◽  
Duncan A. Forbes ◽  
Lee R. Spitler ◽  
Aaron J. Romanowsky ◽  
Jacob A. Arnold ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Wide Field ◽  
Early Type ◽  
Cluster Systems ◽  
Field Imaging ◽  
Wide Field Imaging

Wide-field study of NGC 1172 and its rich globular cluster system

2019 ◽  
Vol 14 (S351) ◽  
pp. 101-104
Author(s):  
Ana I. Ennis ◽  
Lilia P. Bassino ◽  
Juan P. Caso ◽  
Matías Gómez ◽  
Bruno J. De Bórtoli
Keyword(s):  
Field Study ◽  
Globular Cluster ◽  
Elliptical Galaxy ◽  
Cluster System ◽  
Wide Field ◽  
Photometric Study ◽  
Preliminary Results ◽  
Specific Frequency ◽  
Globular Cluster System

AbstractWe present preliminary results of the wide-field photometric study of the isolated elliptical galaxy NGC 1172, and its globular cluster system. Our data was obtained with the GMOS camera mounted on the Gemini South telescope, in the g′, r′, i′ and z′ bands. The aim of this work is to further our understanding of the evolution of NGC 1172, and to look for possible explanations for its unusual high specific frequency.

scholarly journals Dwarf Spheroidal Galaxies

1994 ◽  
Vol 161 ◽  
pp. 525-533
Author(s):  
P.B. Eskridge
Keyword(s):  
Galaxy Formation ◽  
General Problem ◽  
Wide Field ◽  
Crucial Step ◽  
Dwarf Spheroidal Galaxies ◽  
Galaxy Formation And Evolution ◽  
The Galaxy ◽  
Formation And Evolution ◽  
Field Imaging ◽  
Wide Field Imaging

Dwarf Spheroidal (dSph) galaxies are the faintest baryonic systems recognized as galaxies. Understanding the structure and stellar populations of these systems is critical for the modelling of their formation and evolution, and by extension, for understanding the general problem of galaxy formation and evolution. Further, as dSphs are the only available probes of the distant halo of the Galaxy, understanding their structure is a crucial step in the study of the gravitational potential of the halo and the mass of the Galaxy. I will not attempt to review fully all current topics of dSph research. Instead, I will concentrate specifically on those issues that are directly related (as I see it) to the overall topic of wide-field imaging. Recent reviews covering other aspects of dSph research have been written by DaCosta (1988, 1992) and Pryor (1992).

scholarly journals Wide-field study of the peculiar globular cluster system hosted by the field lenticular NGC 1172

2020 ◽  
Vol 499 (2) ◽  
pp. 2554-2563
Author(s):  
Ana Inés Ennis ◽  
Juan Pablo Caso ◽  
Lilia P Bassino ◽  
Ricardo Salinas ◽  
Matías Gómez
Keyword(s):  
Field Study ◽  
Globular Cluster ◽  
Globular Clusters ◽  
Hubble Space Telescope ◽  
Large Fraction ◽  
Cluster System ◽  
Wide Field ◽  
Full Extension ◽  
Specific Frequency ◽  
Globular Cluster System

ABSTRACT We present a wide-field study of the globular cluster system (GCS) of the field lenticular galaxy NGC 1172, based on observations from Gemini Multi-Object Spectrograph/Gemini (optical), FourStar/Magellan (NIR), and archival data from ACS/Hubble Space Telescope (optical). This analysis covers the full extension of the GCS, and results in a value of specific frequency (SN = 8.6 ± 1.5) peculiarly high for an intermediate-mass galaxy in a low-density environment such as this one. We find that the GCS appears to be bimodal, although the colour distribution is narrow and does not allow for an accurate separation of the subpopulations. However, the combination of optical and NIR filters allows us to obtain an estimation of the metallicity distribution based on the photometry, which supports bimodality. We conclude that the presence of a large fraction of metal-poor globular clusters (GCs) and the high specific frequency point to NGC 1172 having accreted a significant amount of GCs from low-mass satellites in the past.

scholarly journals A Deep 20 cm Radio Mosaic of the ESO Key-project Galaxy Redshift Survey

1996 ◽  
Vol 175 ◽  
pp. 523-524
Author(s):  
I. Prandoni ◽  
L. Gregorini ◽  
P. Parma ◽  
H.R. De Ruiter ◽  
G. Vettolani ◽  
...  
Keyword(s):  
Large Fraction ◽  
Wide Field ◽  
Normal Galaxies ◽  
The Galaxy ◽  
Redshift Survey ◽  
Galaxy Redshift ◽  
Galaxy Populations ◽  
Galaxy Population ◽  
Field Imaging ◽  
Wide Field Imaging

In two strips of 22° × 1° and 5° × 1° near the SGP Vettolani et al. (1993, IA U Symposium 161, “Astronomy from Wide Field Imaging”, H.T. MacGillivray ed., Reidel, in press) have made a deep redshift survey as an ESO Key Project. All the galaxies down to bJ ≃ 19.4 were observed with the OPTO-PUS multi-fiber spectrograph on the 3.6 m telescope in La Silla, yielding 3348 redshifts. The survey has a typical depth of z = 0.1. It fully samples the optical luminosity function down to B = −15 and various galaxy populations (e.g. normal galaxies, LSBDs and BCDs) are present. Interestingly, emission lines (OII, Hβ, OIII) have been found in a large fraction of the galaxy spectra (≃ 40%), suggesting strong evolution of the galaxy population in terms of enhanced star formation.

scholarly journals The Globular Cluster System of NGC 1316

2002 ◽  
Vol 207 ◽  
pp. 321-323
Author(s):  
Matías Gómez ◽  
Tom Richtler ◽  
Leopoldo Infante ◽  
Georg Drenkhahn
Keyword(s):  
Globular Cluster ◽  
Stellar Population ◽  
Cluster System ◽  
Angular Distributions ◽  
Population Synthesis ◽  
Stellar Population Synthesis ◽  
The Galaxy ◽  
Specific Frequency ◽  
Globular Cluster System ◽  
Fornax Cluster

We have studied the Globular Cluster System of the merger galaxy NGC 1316 in Fornax, using CCD BV I photometry. Dividing the sample into red (presumably metal-rich) and blue (metal-poor) subpopulations at B - I = 1.75, we find that they follow strikingly different angular distributions. The red clusters show a strong correlation with the galaxy elongation, but the blue ones are circularly distributed. An astonishingly low specific frequency for NGC 1316 of only SN = 0.9±0.2 is derived, which confirms with a larger field a previous finding by Grillmair et al. (1999). Assuming a “normal” SN of ∼ 4 for early-type galaxies, we use stellar population synthesis models to estimate the merger age to about 2 Gyr, if an intermediate-age population were to explain the low SN we observe. By fitting t5 functions to the Globular Cluster Luminosity Function (GCLF), we derive the following turnover magnitudes: and . They support that NGC 1316, in spite of its outlying location, is at the same distance as the core of the Fornax cluster.

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