A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system

We present new wide-field photometry and spectroscopy of the globular clusters (GCs) around NGC 4649 (M60), the third brightest galaxy in the Virgo cluster. Imaging of NGC 4649 was assembled from a recently obtained <i>Hubble Space Telescope</i>/Advanced Camera for Surveys mosaic, and ne...

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Detalles Bibliográficos
Autores principales: Faifer, Favio Raúl, Forte, Juan Carlos
Formato: Articulo
Lenguaje:Inglés
Publicado: 2015
Materias:
Ciencias Astronómicas
Galaxies: formation
Galaxies: haloes
Galaxies: kinematics and dynamics
Galaxies: star clusters: individual: NGC 4649
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/86044
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-86044
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: formation
Galaxies: haloes
Galaxies: kinematics and dynamics
Galaxies: star clusters: individual: NGC 4649
spellingShingle Ciencias Astronómicas
Galaxies: formation
Galaxies: haloes
Galaxies: kinematics and dynamics
Galaxies: star clusters: individual: NGC 4649
Faifer, Favio Raúl
Forte, Juan Carlos
A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system
topic_facet Ciencias Astronómicas
Galaxies: formation
Galaxies: haloes
Galaxies: kinematics and dynamics
Galaxies: star clusters: individual: NGC 4649
description We present new wide-field photometry and spectroscopy of the globular clusters (GCs) around NGC 4649 (M60), the third brightest galaxy in the Virgo cluster. Imaging of NGC 4649 was assembled from a recently obtained <i>Hubble Space Telescope</i>/Advanced Camera for Surveys mosaic, and new Subaru/Suprime-Cam and archival Canada-France- Hawaii Telescope/MegaCam data. About 1200 sources were followed up spectroscopically using combined observations from three multi-object spectrographs: Keck/Deep Imaging Multi-Object Spectrograph, Gemini/Gemini Multi-Object Spectrograph and Multiple Mirror Telescope/Hectospec. We confirm 431 unique GCs belonging to NGC 4649, a factor of 3.5 larger than previous data sets and with a factor of 3 improvement in velocity precision. We confirm significant GC colour bimodality and find that the red GCs are more centrally concentrated, while the blue GCs are more spatially extended. We infer negative GC colour gradients in the innermost 20 kpc and flat gradients out to large radii. Rotation is detected along the galaxy major axis for all tracers: blue GCs, red GCs, galaxy stars and planetary nebulae. We compare the observed properties of NGC 4649 with galaxy formation models. We find that formation via amajor merger between two gas-poor galaxies, followed by satellite accretion, can consistently reproduce the observations of NGC 4649 at different radii. We find no strong evidence to support an interaction between NGC 4649 and the neighbouring spiral galaxy NGC 4647. We identify interesting GC kinematic features in our data, such as counter-rotating subgroups and bumpy kinematic profiles, which encode more clues about the formation history of NGC 4649.
format Articulo
Articulo
author Faifer, Favio Raúl
Forte, Juan Carlos
author_facet Faifer, Favio Raúl
Forte, Juan Carlos
author_sort Faifer, Favio Raúl
title A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system
title_short A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system
title_full A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system
title_fullStr A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system
title_full_unstemmed A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system
title_sort sluggs and gemini/gmos combined study of the elliptical galaxy m60: wide-field photometry and kinematics of the globular cluster system
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/86044
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AT fortejuancarlos sluggsandgeminigmoscombinedstudyoftheellipticalgalaxym60widefieldphotometryandkinematicsoftheglobularclustersystem
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