Globular cluster systems in low-luminosity early-type galaxies near the Fornax cluster centre

Bassino, L. P.; Richtler, T.; Dirsch, B.

doi:10.1111/j.1365-2966.2005.09919.x

Cited by 65 publications

(80 citation statements)

References 61 publications

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“…We count 20 such bright ICGCs beyond 50 kpc, which would imply a 66% stripping efficiency if it was the only process at play. This may be a lower estimate, considering the low S N values found recently by Bassino et al (2006b) for some early-types in our fields. Such a high stripping efficiency is unlikely and suggests that part of the ICGCs are a primordial intracluster population.…”

Section: Discussioncontrasting

confidence: 53%

Globular clusters and dwarf galaxies in Fornax

Bergond

Athanassoula²,

Léon

et al. 2007

A&A

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Aims. We acquired radial velocities of a significant number of globular clusters (GCs) on wide fields between galaxies in the nearby Fornax cluster of galaxies, in order to derive their velocity dispersion radial profile and to probe the dynamics of the cluster. Methods. We used FLAMES on the VLT to obtain accurate velocities for 149 GCs, within a ≈500 × 150 kpc strip centered on NGC 1399, the Fornax central galaxy. These objects are at the very bright tail (M V < ∼ −9.5) of the GC luminosity function, overlapping the so-called "ultra-compact dwarfs" magnitude range. Eight of the brightest FLAMES-confirmed members indeed show hints of resolution in the subarcsecond pre-imaging data we used for selecting the ∼500 targets for FLAMES spectroscopy. Results. Ignoring the GCs around galaxies by applying 3d 25 diameter masks, we find 61 GCs of 20.0 ≤ V ≤ 22.2 lying in the intracluster (IC) medium. The velocity dispersion of the population of ICGCs is 200 km s −1 at ∼150 kpc from the central NGC 1399 and rises to nearly 400 km s −1 at 200 kpc, a value which compares with the velocity dispersion of the population of dwarf galaxies, thought to be infalling from the surroundings of the cluster.

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Section: Discussioncontrasting

confidence: 53%

Globular clusters and dwarf galaxies in Fornax

Bergond

Athanassoula²,

Léon

et al. 2007

A&A

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“…The best fit values are given in Table 1. The red GCs are more centrally concentrated than the blue GCs, as found in other galaxies (e.g., Forte et al 2005;Bassino et al 2006;Strader et al 2011;Forbes et al 2012). …”

Section: Samplementioning

confidence: 62%

The SLUGGS survey: multipopulation dynamical modelling of the elliptical galaxy NGC 1407 from stars and globular clusters

Pota¹,

Romanowsky²,

Brodie³

et al. 2015

Monthly Notices of the Royal Astronomical Society

103

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We perform in-depth dynamical modelling of the luminous and dark matter (DM) content of the elliptical galaxy NGC 1407. Our strategy consists of solving the spherical Jeans equations for three independent dynamical tracers: stars, blue GCs and red GCs in a self-consistent manner. We adopt a maximum-likelihood Markov-Chain Monte Carlo fitting technique in the attempt to constrain the inner slope of the DM density profile (the cusp/core problem), and the stellar initial mass function (IMF) of the galaxy. We find the inner logarithmic slope of the DM density profiles to be γ = 0.6±0.4, which is consistent with either a DM cusp (γ = 1) or with a DM core (γ = 0). Our findings are consistent with a Salpeter IMF, and marginally consistent with a Kroupa IMF. We infer tangential orbits for the blue GCs, and radial anisotropy for red GCs and stars. The modelling results are consistent with the virial mass-concentration relation predicted by ΛCDM simulations. The virial mass of NGC 1407 is log M vir = 13.3 ± 0.2M ⊙ , whereas the stellar mass is log M * = 11.8 ± 0.1M ⊙ . The overall uncertainties on the mass of NGC 1407 are only 5 per cent at the projected stellar effective radius. We attribute the disagreement between our results and previous X-ray results to the gas not being in hydrostatic equilibrium in the central regions of the galaxy. The halo of NGC 1407 is found be DM dominated, with a dynamical mass-to-light ratio of M/L = 260 +174 −100 M ⊙ /L ⊙,B . However, this value can be larger up to a factor of 3 depending on the assumed prior on the DM scale radius.

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“…The MOSAIC data in the "east" and "northeast" fields were reduced using the mscred package within IRAF 1 , following the same procedure applied to the "central" field in Paper I and to another field obtained in the same run (west of NGC 1399, Bassino et al 2006). This western field is not included in the present study since it contains several galaxies with their own GCSs, which would severely contaminate any search for 1 IRAF is distributed by the National Optical Astronomy Observatories, which is operated by AURA, Inc. under contract to the National Science Foundation.…”

Section: Observations and Reductionsmentioning

confidence: 99%

Large-scale study of the NGC 1399 globular cluster system in Fornax

Bassino

Faifer

Forte

et al. 2006

A&A

128

182

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We present a Washington C and Kron-Cousins R photometric study of the globular cluster system of NGC 1399, the central galaxy of the Fornax cluster. A large areal coverage of 1 square degree around NGC 1399 is achieved with three adjoining fields of the MOSAIC II Imager at the CTIO 4-m telescope. Working on such a large field, we can perform the first indicative determination of the total size of the NGC 1399 globular cluster system. The estimated angular extent, measured from the NGC 1399 centre and up to a limiting radius where the areal density of blue globular clusters falls to 30 per cent of the background level, is 45 ± 5 arcmin, which corresponds to 220−275 kpc at the Fornax distance. The bimodal colour distribution of this globular cluster system, as well as the different radial distribution of blue and red clusters, up to these large distances from the parent galaxy, are confirmed. The azimuthal globular cluster distribution exhibits asymmetries that might be understood in terms of tidal stripping of globulars from NGC 1387, a nearby galaxy. The good agreement between the areal density profile of blue clusters and a projected dark-matter NFW density profile is emphasized.

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Globular cluster systems in low-luminosity early-type galaxies near the Fornax cluster centre

Cited by 65 publications

References 61 publications

Globular clusters and dwarf galaxies in Fornax

Globular clusters and dwarf galaxies in Fornax

The SLUGGS survey: multipopulation dynamical modelling of the elliptical galaxy NGC 1407 from stars and globular clusters

Large-scale study of the NGC 1399 globular cluster system in Fornax

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