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

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作者：
Bassino, L.P. [1 ,2 ]
Faifer, F.R. [1 ,2 ]
Forte, J.C. [1 ]
Dirsch, B. [3 ]
Richtler, T. [3 ]
Geisler, D. [3 ]
Schuberth, Y. [4 ]
机构：
[1] CONICET, Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de la Plata, Paseo del Bosque S/N, 1900 La Plata, Argentina
[2] IALP, CONICET, Argentina
[3] Universidad de Conceptión, Departamento de Física, Casilla 160, Concepción, Chile
[4] Sternwarte der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
来源：
Astronomy and Astrophysics | 1600年 / 451卷 / 03期
关键词：
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. © ESO 2006;
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页码：789 / 796
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