Gemini/GMOS imaging of globular cluster systems in five early-type galaxies

In this paper, we present deep high-quality photometry of globular cluster systems (GCSs) belonging to five early-type galaxies, covering a range of mass and environment. Photometric data were obtained with the Gemini North and Gemini South telescopes in the filter passbands g', r' and i&#...

Descripción completa

Detalles Bibliográficos
Autores principales: Faifer, Favio Raúl, Forte, Juan Carlos, Norris, Mark A., Bridges, Terry, Forbes, Duncan A., Zepf, Stephen E., Beasley, Mike, Gebhardt, Karl, Hanes, David A., Sharples, Ray M.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Ciencias Astronómicas
Galaxies: elliptical and lenticular, cD
Galaxies: star clusters: general
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84926
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84926
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: elliptical and lenticular, cD
Galaxies: star clusters: general
spellingShingle Ciencias Astronómicas
Galaxies: elliptical and lenticular, cD
Galaxies: star clusters: general
Faifer, Favio Raúl
Forte, Juan Carlos
Norris, Mark A.
Bridges, Terry
Forbes, Duncan A.
Zepf, Stephen E.
Beasley, Mike
Gebhardt, Karl
Hanes, David A.
Sharples, Ray M.
Gemini/GMOS imaging of globular cluster systems in five early-type galaxies
topic_facet Ciencias Astronómicas
Galaxies: elliptical and lenticular, cD
Galaxies: star clusters: general
description In this paper, we present deep high-quality photometry of globular cluster systems (GCSs) belonging to five early-type galaxies, covering a range of mass and environment. Photometric data were obtained with the Gemini North and Gemini South telescopes in the filter passbands g', r' and i'. The combination of these filters with good seeing conditions allows an excellent separation between globular cluster (GC) candidates and unresolved field objects. In fact, our previously published spectroscopic data indicate a contamination level of only ~10 per cent in our sample of GC candidates. Bimodal GC colour distributions are found in all five galaxies. Most of the GCSs appear bimodal even in the (g'-r') versus (r'-i') plane. A population of resolved/marginally resolved GC and ultracompact dwarf candidates was found in all the galaxies. A search for the so-called 'blue tilt' in the colour-magnitude diagrams reveals that NGC 4649 clearly shows this phenomenon, although no conclusive evidence was found for the other galaxies in the sample. This 'blue tilt' translates into a mass-metallicity relation given by Z∝M0.28 ±0.03. This dependence was found using a new empirical (g'-i') versus [Z/H] relation, which relies on an homogeneous sample of GC colours and metallicities. In this paper, we also explore the radial trends in both colour and surface density for the blue (metal-poor) and red (metal-rich) GC subpopulations. As usual, the red GCs show a steeper radial distribution than the blue GCs. Evidence of galactocentric colour gradients is found in some of the GCSs, which is more significant for the two S0 galaxies in the sample. Red GC subpopulations show similar colours and gradients to the galaxy halo stars in their inner region. A GC mean colour-galaxy luminosity relation, consistent with [Z/H]∝L0.26 ±0.08B, is present for the red GCs. Estimates of the total GC populations and specific frequency SN values are presented for NGC 3115, 3923 and 4649.
format Articulo
Articulo
author Faifer, Favio Raúl
Forte, Juan Carlos
Norris, Mark A.
Bridges, Terry
Forbes, Duncan A.
Zepf, Stephen E.
Beasley, Mike
Gebhardt, Karl
Hanes, David A.
Sharples, Ray M.
author_facet Faifer, Favio Raúl
Forte, Juan Carlos
Norris, Mark A.
Bridges, Terry
Forbes, Duncan A.
Zepf, Stephen E.
Beasley, Mike
Gebhardt, Karl
Hanes, David A.
Sharples, Ray M.
author_sort Faifer, Favio Raúl
title Gemini/GMOS imaging of globular cluster systems in five early-type galaxies
title_short Gemini/GMOS imaging of globular cluster systems in five early-type galaxies
title_full Gemini/GMOS imaging of globular cluster systems in five early-type galaxies
title_fullStr Gemini/GMOS imaging of globular cluster systems in five early-type galaxies
title_full_unstemmed Gemini/GMOS imaging of globular cluster systems in five early-type galaxies
title_sort gemini/gmos imaging of globular cluster systems in five early-type galaxies
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/84926
work_keys_str_mv AT faiferfavioraul geminigmosimagingofglobularclustersystemsinfiveearlytypegalaxies
AT fortejuancarlos geminigmosimagingofglobularclustersystemsinfiveearlytypegalaxies
AT norrismarka geminigmosimagingofglobularclustersystemsinfiveearlytypegalaxies
AT bridgesterry geminigmosimagingofglobularclustersystemsinfiveearlytypegalaxies
AT forbesduncana geminigmosimagingofglobularclustersystemsinfiveearlytypegalaxies
AT zepfstephene geminigmosimagingofglobularclustersystemsinfiveearlytypegalaxies
AT beasleymike geminigmosimagingofglobularclustersystemsinfiveearlytypegalaxies
AT gebhardtkarl geminigmosimagingofglobularclustersystemsinfiveearlytypegalaxies
AT hanesdavida geminigmosimagingofglobularclustersystemsinfiveearlytypegalaxies
AT sharplesraym geminigmosimagingofglobularclustersystemsinfiveearlytypegalaxies
bdutipo_str Repositorios
_version_ 1764820488729657345

Ejemplares similares