Gemini/GMOS spectra of globular clusters in the Virgo giant elliptical NGC 4649

NGC 4649 (M60) is one of a handful of giant Virgo ellipticals. We have obtained Gemini/GMOS (Gemini North Multi-Object Spectrograph) spectra for 38 globular clusters (GCs) associated with this galaxy. Applying the multi-index χ<SUP>2</SUP> minimization technique of Proctor and Sansom wit...

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Autores principales: Pierce, Michael, Bridges, Terry, Forbes, Duncan A., Proctor, Robert, Beasley, Michael A., Gebhardt, Karl, Faifer, Favio Raúl, Forte, Juan Carlos, Zepf, Stephen E., Sharpies, Ray, Hanes, David A.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2006
Materias:
Ciencias Astronómicas
Galaxies: individual: NGC 4649
Galaxies: star clusters
Globular clusters: general
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84358
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84358
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: NGC 4649
Galaxies: star clusters
Globular clusters: general
spellingShingle Ciencias Astronómicas
Galaxies: individual: NGC 4649
Galaxies: star clusters
Globular clusters: general
Pierce, Michael
Bridges, Terry
Forbes, Duncan A.
Proctor, Robert
Beasley, Michael A.
Gebhardt, Karl
Faifer, Favio Raúl
Forte, Juan Carlos
Zepf, Stephen E.
Sharpies, Ray
Hanes, David A.
Gemini/GMOS spectra of globular clusters in the Virgo giant elliptical NGC 4649
topic_facet Ciencias Astronómicas
Galaxies: individual: NGC 4649
Galaxies: star clusters
Globular clusters: general
description NGC 4649 (M60) is one of a handful of giant Virgo ellipticals. We have obtained Gemini/GMOS (Gemini North Multi-Object Spectrograph) spectra for 38 globular clusters (GCs) associated with this galaxy. Applying the multi-index χ<SUP>2</SUP> minimization technique of Proctor and Sansom with the single stellar population models of Thomas, Maraston and Korn, we derive ages, metallicities and α-element abundance ratios. We find several young (2-3 Gyr old) supersolar metallicity GCs, while the majority are old (>10 Gyr), spanning a range of metallicities from solar to [Z/H] = -2. At least two of these young GCs are at large projected radii of 17-20 kpc. The galaxy itself shows no obvious signs of a recent starburst, interaction or merger. A trend of decreasing α-element ratio with increasing metallicity is found.
format Articulo
Articulo
author Pierce, Michael
Bridges, Terry
Forbes, Duncan A.
Proctor, Robert
Beasley, Michael A.
Gebhardt, Karl
Faifer, Favio Raúl
Forte, Juan Carlos
Zepf, Stephen E.
Sharpies, Ray
Hanes, David A.
author_facet Pierce, Michael
Bridges, Terry
Forbes, Duncan A.
Proctor, Robert
Beasley, Michael A.
Gebhardt, Karl
Faifer, Favio Raúl
Forte, Juan Carlos
Zepf, Stephen E.
Sharpies, Ray
Hanes, David A.
author_sort Pierce, Michael
title Gemini/GMOS spectra of globular clusters in the Virgo giant elliptical NGC 4649
title_short Gemini/GMOS spectra of globular clusters in the Virgo giant elliptical NGC 4649
title_full Gemini/GMOS spectra of globular clusters in the Virgo giant elliptical NGC 4649
title_fullStr Gemini/GMOS spectra of globular clusters in the Virgo giant elliptical NGC 4649
title_full_unstemmed Gemini/GMOS spectra of globular clusters in the Virgo giant elliptical NGC 4649
title_sort gemini/gmos spectra of globular clusters in the virgo giant elliptical ngc 4649
publishDate 2006
url http://sedici.unlp.edu.ar/handle/10915/84358
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