Multicolour-metallicity relations from globular clusters in NGC 4486 (M87)

We present Gemini griz' photometry for 521 globular cluster (GC) candidates in a 5.5 × 5.5 arcmin<sup>2</sup> field centred 3.8 arcmin to the south and 0.9arcmin to the west of the centre of the giant elliptical galaxy NGC 4486. All these objects have previously published (C - T<...

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Detalles Bibliográficos
Autores principales: Forte, Juan Carlos, Faifer, Favio Raúl, Vega, Ema Irene, Bassino, Lilia Patricia, Smith Castelli, Analía Viviana, Cellone, Sergio Aldo, Geisler, Douglas
Formato: Articulo
Lenguaje:Inglés
Publicado: 2013
Materias:
Ciencias Astronómicas
Galaxies:Haloes
Galaxies:Star clusters:General
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/85479
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-85479
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:Haloes
Galaxies:Star clusters:General
spellingShingle Ciencias Astronómicas
Galaxies:Haloes
Galaxies:Star clusters:General
Forte, Juan Carlos
Faifer, Favio Raúl
Vega, Ema Irene
Bassino, Lilia Patricia
Smith Castelli, Analía Viviana
Cellone, Sergio Aldo
Geisler, Douglas
Multicolour-metallicity relations from globular clusters in NGC 4486 (M87)
topic_facet Ciencias Astronómicas
Galaxies:Haloes
Galaxies:Star clusters:General
description We present Gemini griz' photometry for 521 globular cluster (GC) candidates in a 5.5 × 5.5 arcmin<sup>2</sup> field centred 3.8 arcmin to the south and 0.9arcmin to the west of the centre of the giant elliptical galaxy NGC 4486. All these objects have previously published (C - T<sub>1</sub>) photometry. We also present new (C - T<sub>1</sub>) photometry for 338 globulars, within 1.7 arcmin in galactocentric radius, which have (g - z) colours in the photometric system adopted by the Virgo Cluster Survey of the Advanced Camera for Surveys of the Hubble Space Telescope (HST). These photometric data are used to define a self-consistent multicolour grid (avoiding polynomial fits) and preliminarily calibrated in terms of two chemical abundance scales. The resulting multicolour colour-chemical abundance relations are used to test GC chemical abundance distributions. This is accomplished by modelling the 10 GC colour histograms that can be defined in terms of the Cgriz' bands. Our results suggest that the best fit to the GC observed colour histograms is consistent with a genuinely bimodal chemical abundance distribution N<sub>GC</sub>(Z). On the other side, each ('blue' and 'red') GC subpopulation follows a distinct colour-colour relation.
format Articulo
Articulo
author Forte, Juan Carlos
Faifer, Favio Raúl
Vega, Ema Irene
Bassino, Lilia Patricia
Smith Castelli, Analía Viviana
Cellone, Sergio Aldo
Geisler, Douglas
author_facet Forte, Juan Carlos
Faifer, Favio Raúl
Vega, Ema Irene
Bassino, Lilia Patricia
Smith Castelli, Analía Viviana
Cellone, Sergio Aldo
Geisler, Douglas
author_sort Forte, Juan Carlos
title Multicolour-metallicity relations from globular clusters in NGC 4486 (M87)
title_short Multicolour-metallicity relations from globular clusters in NGC 4486 (M87)
title_full Multicolour-metallicity relations from globular clusters in NGC 4486 (M87)
title_fullStr Multicolour-metallicity relations from globular clusters in NGC 4486 (M87)
title_full_unstemmed Multicolour-metallicity relations from globular clusters in NGC 4486 (M87)
title_sort multicolour-metallicity relations from globular clusters in ngc 4486 (m87)
publishDate 2013
url http://sedici.unlp.edu.ar/handle/10915/85479
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