Abstract:
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.
Registro:
Documento: |
Artículo
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Título: | The abundance distribution and luminosity function of globular clusters in NGC 1399 |
Autor: | Geisler, D.; Forte, J.C. |
Filiación: | Natl. Optical Astron. Observatories, Cerro Tololo Inter-Amer. Observatory Inst. Astronomia y Fis. del Espacio, Buenos Aires, Argentina Assoc. Universities Res. Astron., I., National Science Foundation Inst. Astronomia y Fis. del Espacio, Casilla de Correo 67, Sucursal 28, 1428 Buenos Aires, Argentina Natl. Optical Astron. Observatories, Cerro Tololo Inter-Amer. Observatory, Casilla 603, La Serena, Chile
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Palabras clave: | Abundances; Clusters: globular; Galaxies: abundances; Galaxies: distances; Luminosity function |
Año: | 1990
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Volumen: | 350
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Número: | 1 PART 2
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Página de inicio: | L5
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Página de fin: | L8
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DOI: |
http://dx.doi.org/10.1086/185654 |
Título revista: | Astrophysical Journal
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Título revista abreviado: | Astrophys. J.
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ISSN: | 0004637X
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v350_n1PART2_pL5_Geisler |
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Citas:
---------- APA ----------
Geisler, D. & Forte, J.C.
(1990)
. The abundance distribution and luminosity function of globular clusters in NGC 1399. Astrophysical Journal, 350(1 PART 2), L5-L8.
http://dx.doi.org/10.1086/185654---------- CHICAGO ----------
Geisler, D., Forte, J.C.
"The abundance distribution and luminosity function of globular clusters in NGC 1399"
. Astrophysical Journal 350, no. 1 PART 2
(1990) : L5-L8.
http://dx.doi.org/10.1086/185654---------- MLA ----------
Geisler, D., Forte, J.C.
"The abundance distribution and luminosity function of globular clusters in NGC 1399"
. Astrophysical Journal, vol. 350, no. 1 PART 2, 1990, pp. L5-L8.
http://dx.doi.org/10.1086/185654---------- VANCOUVER ----------
Geisler, D., Forte, J.C. The abundance distribution and luminosity function of globular clusters in NGC 1399. Astrophys. J. 1990;350(1 PART 2):L5-L8.
http://dx.doi.org/10.1086/185654