The abundance distribution and luminosity function of globular clusters in NGC 1399

Integrated Washington photometry has been obtained for the globular cluster system of NGC 1399, the central elliptical galaxy in the Fornax cluster. A new integrated metallicity index, C-T1, is defined which is about 3 times more sensitive to metal abundance than the previous such Washington index....

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Guardado en:
Detalles Bibliográficos
Publicado: 1990
Materias:
Abundances
Clusters: globular
Galaxies: abundances
Galaxies: distances
Luminosity function
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v350_n1PART2_pL5_Geisler
http://hdl.handle.net/20.500.12110/paper_0004637X_v350_n1PART2_pL5_Geisler
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0004637X_v350_n1PART2_pL5_Geisler
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spelling paper:paper_0004637X_v350_n1PART2_pL5_Geisler2023-06-08T14:28:29Z The abundance distribution and luminosity function of globular clusters in NGC 1399 Abundances Clusters: globular Galaxies: abundances Galaxies: distances Luminosity function Integrated Washington photometry has been obtained for the globular cluster system of NGC 1399, the central elliptical galaxy in the Fornax cluster. A new integrated metallicity index, C-T1, is defined which is about 3 times more sensitive to metal abundance than the previous such Washington index. Abundances accurate to 0.3 dex are derived for ∼150 of the brightest globular clusters. The clusters have a broad, flattened abundance distribution, with a mean metallicity of [Fe/H] = ∼0.85 ± 0.1, 0.75 dex more metal-poor than the halo. A significant fraction of the clusters have an approximately solar abundance, while virtually no clusters exist with [Fe/H] < -2. The luminosity function is also determined for ∼600 clusters to a limiting magnitude of T1∼23.75 (50% completeness limit). The luminosity function clearly shows a turnover at T1 = 23.0 ± 0.15 or V = 23.45 ± 0.16. Matching this luminosity function with that for the globular cluster system of the Galaxy and M87 yields a distance modulus of 31.0 ± 0.25 for Fornax, 0.5 ± 0.2 mag closer than Virgo. A Hubble constant of 66 ± 14 km s-1 Mpc-1 is derived assuming a canonical value for the Local Group Virgocentric infall velocity. Alternatively, solving for this infall velocity gives a value of 236 km s-1. 1990 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v350_n1PART2_pL5_Geisler http://hdl.handle.net/20.500.12110/paper_0004637X_v350_n1PART2_pL5_Geisler
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Abundances
Clusters: globular
Galaxies: abundances
Galaxies: distances
Luminosity function
spellingShingle Abundances
Clusters: globular
Galaxies: abundances
Galaxies: distances
Luminosity function
The abundance distribution and luminosity function of globular clusters in NGC 1399
topic_facet Abundances
Clusters: globular
Galaxies: abundances
Galaxies: distances
Luminosity function
description Integrated Washington photometry has been obtained for the globular cluster system of NGC 1399, the central elliptical galaxy in the Fornax cluster. A new integrated metallicity index, C-T1, is defined which is about 3 times more sensitive to metal abundance than the previous such Washington index. Abundances accurate to 0.3 dex are derived for ∼150 of the brightest globular clusters. The clusters have a broad, flattened abundance distribution, with a mean metallicity of [Fe/H] = ∼0.85 ± 0.1, 0.75 dex more metal-poor than the halo. A significant fraction of the clusters have an approximately solar abundance, while virtually no clusters exist with [Fe/H] < -2. The luminosity function is also determined for ∼600 clusters to a limiting magnitude of T1∼23.75 (50% completeness limit). The luminosity function clearly shows a turnover at T1 = 23.0 ± 0.15 or V = 23.45 ± 0.16. Matching this luminosity function with that for the globular cluster system of the Galaxy and M87 yields a distance modulus of 31.0 ± 0.25 for Fornax, 0.5 ± 0.2 mag closer than Virgo. A Hubble constant of 66 ± 14 km s-1 Mpc-1 is derived assuming a canonical value for the Local Group Virgocentric infall velocity. Alternatively, solving for this infall velocity gives a value of 236 km s-1.
title The abundance distribution and luminosity function of globular clusters in NGC 1399
title_short The abundance distribution and luminosity function of globular clusters in NGC 1399
title_full The abundance distribution and luminosity function of globular clusters in NGC 1399
title_fullStr The abundance distribution and luminosity function of globular clusters in NGC 1399
title_full_unstemmed The abundance distribution and luminosity function of globular clusters in NGC 1399
title_sort abundance distribution and luminosity function of globular clusters in ngc 1399
publishDate 1990
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v350_n1PART2_pL5_Geisler
http://hdl.handle.net/20.500.12110/paper_0004637X_v350_n1PART2_pL5_Geisler
_version_ 1768542766259765248

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