The globular cluster system of the low-luminosity elliptical galaxy NGC 1427

Washington photometry is presented for a large number of globular cluster candidates associated with the low-luminosity elliptical galaxy NGC 1427 in the Fornax cluster. The survey is mostly complete to T1 = 23.5 (V ≈ 24.0) and includes an areal coverage of about 216 arcmin2, centered near the galax...

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Autores principales: Forte, Juan Carlos, Geisler, Doug, Ostrov, Pablo Gabriel, Piatti, Andrés E., Gieren, Wolfgang
Formato: Articulo
Lenguaje:Inglés
Publicado: 2001
Materias:
Ciencias Astronómicas
Galaxies: individual
Galaxies: star clusters
NGC 1427
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83442
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83442
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Galaxies: individual
Galaxies: star clusters
NGC 1427
spellingShingle Ciencias Astronómicas
Galaxies: individual
Galaxies: star clusters
NGC 1427
Forte, Juan Carlos
Geisler, Doug
Ostrov, Pablo Gabriel
Piatti, Andrés E.
Gieren, Wolfgang
The globular cluster system of the low-luminosity elliptical galaxy NGC 1427
topic_facet Ciencias Astronómicas
Galaxies: individual
Galaxies: star clusters
NGC 1427
description Washington photometry is presented for a large number of globular cluster candidates associated with the low-luminosity elliptical galaxy NGC 1427 in the Fornax cluster. The survey is mostly complete to T1 = 23.5 (V ≈ 24.0) and includes an areal coverage of about 216 arcmin2, centered near the galaxy. Most previous studies have failed to detect any evidence of multiple globular cluster populations in this low-luminosity elliptical, in sharp contrast to the bimodal globular cluster systems commonly found in giant ellipticals. The lack of multimodal cluster populations has been used as the basis for suggesting that the formation mechanisms for low-luminosity and giant ellipticals are significantly different. Our metallicity-sensitive C-T1 photometry (the first such study of a low-luminosity elliptical) reveals a definite bimodal cluster population. The red globular cluster population appears strongly centrally concentrated and practically disappears beyond a galactocentric radius of 120″. The mean color of these clusters is similar to that of the inner galaxy halo. Blue globulars, on the other hand, exhibit a shallower spatial distribution. These clusters share a small negative C-T1 color gradient with the galaxy halo, although they are, on average, some 0.3 mag bluer at all galactocentric radii. The overall mean cluster system metallicity is -0.9 ± 0.2. The specific globular cluster frequency SN is 4.5 ± 0.8, if a distance modulus (V0 - Mv) = 31.0 is adopted. Our results demonstrate that nonunimodal globular cluster populations exist in low-luminosity ellipticals, as well as in giant ellipticals, and thus that the formation mechanisms for these galaxies may share some similarities.
format Articulo
Articulo
author Forte, Juan Carlos
Geisler, Doug
Ostrov, Pablo Gabriel
Piatti, Andrés E.
Gieren, Wolfgang
author_facet Forte, Juan Carlos
Geisler, Doug
Ostrov, Pablo Gabriel
Piatti, Andrés E.
Gieren, Wolfgang
author_sort Forte, Juan Carlos
title The globular cluster system of the low-luminosity elliptical galaxy NGC 1427
title_short The globular cluster system of the low-luminosity elliptical galaxy NGC 1427
title_full The globular cluster system of the low-luminosity elliptical galaxy NGC 1427
title_fullStr The globular cluster system of the low-luminosity elliptical galaxy NGC 1427
title_full_unstemmed The globular cluster system of the low-luminosity elliptical galaxy NGC 1427
title_sort globular cluster system of the low-luminosity elliptical galaxy ngc 1427
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/83442
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