Intra-cluster globular clusters around NGC 1399 in Fornax?
| Autor: | Y. Schuberth, Michael Hilker, Thomas Richtler, Lilia Patricia Bassino |
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| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
Ciencias Astronómicas
Kinematics Ciencias Físicas star clusters [Galaxies] FOS: Physical sciences NGC 1399 (galaxia) Astrophysics elliptical and lenticular cD [Galaxies] Fornax cluster purl.org/becyt/ford/1 [https] Photometry (optics) individual: NGC 1399 [Galaxies] Cluster (physics) Fornax Cluster clusters: individual: Fornax cluster [Galaxies] Physics kinematics and dynamics [Galaxies] Galaxies: individual: NGC 1399 Astrophysics (astro-ph) Galaxies: kinematics and dynamics Velocity dispersion Astronomy and Astrophysics purl.org/becyt/ford/1.3 [https] Galaxies Galaxies: star clusters Galaxy Astronomía Radial velocity Galaxies: elliptical and lenticular cD Orbit Space and Planetary Science Globular cluster Star clusters Galaxies: clusters: individual: Fornax cluster CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP Astronomy & Astrophysics Artículos CONICYT CONICYT Chile instacron:CONICYT CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| Popis: | Aims. We investigate whether the globular clusters (GCs) in the recently published sample of GCs in the Fornax cluster by Bergond and coworkers are indeed intra-cluster objects. Methods. We combine their catalogue of radial velocity measurements with our CTIO MOSAIC photometry in the Washington system and analyse the relation of metal-poor and metal-rich GCs with their host galaxies. Results. The metal-rich GCs appear to be kinematically associated with their respective host galaxies. The vast majority of the metal-poor GCs found in between the galaxies of the Fornax cluster have velocities that are consistent with their being members of the very extended NGC 1399 GC system. We find that when the sample is restricted to the most accurate velocity measurements, the GC velocity dispersion profile can be described with a mass model derived for the NGC 1399 GC system, within 80kpc. We identify one "vagrant" GC whose radial velocity suggests that it is not bound to any galaxy unless its orbit has a very large apogalactic distance. Facultad de Ciencias Astronómicas y Geofísicas |
| Databáze: | OpenAIRE |
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