Gemini/GMOS spectroscopy of the spheroid and globular cluster system of NGC 3923

We present a technique to extract ultra-deep diffuse-light spectra from the standard multi-object spectroscopic observations used to investigate extragalactic globular cluster (GC) systems. This technique allows a clean extraction of the spectrum of the host galaxy diffuse light from the same slitle...

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Detalles Bibliográficos
Autores principales:	Norris, Mark A., Sharples, Ray M., Bridges, Terry, Gebhardt, Karl, Forbes, Duncan A., Proctor, Robert, Faifer, Favio Raúl, Forte, Juan Carlos, Beasley, Michael A., Zepf, Stephen E., Hanes, David A.
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2008
Materias:	Ciencias Astronómicas Galaxies: abundances Galaxies: general Galaxies: individual: NGC 3923 Galaxies: stellar content Globular clusters: general
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/84781
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-84781
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: abundances Galaxies: general Galaxies: individual: NGC 3923 Galaxies: stellar content Globular clusters: general
spellingShingle	Ciencias Astronómicas Galaxies: abundances Galaxies: general Galaxies: individual: NGC 3923 Galaxies: stellar content Globular clusters: general Norris, Mark A. Sharples, Ray M. Bridges, Terry Gebhardt, Karl Forbes, Duncan A. Proctor, Robert Faifer, Favio Raúl Forte, Juan Carlos Beasley, Michael A. Zepf, Stephen E. Hanes, David A. Gemini/GMOS spectroscopy of the spheroid and globular cluster system of NGC 3923
topic_facet	Ciencias Astronómicas Galaxies: abundances Galaxies: general Galaxies: individual: NGC 3923 Galaxies: stellar content Globular clusters: general
description	We present a technique to extract ultra-deep diffuse-light spectra from the standard multi-object spectroscopic observations used to investigate extragalactic globular cluster (GC) systems. This technique allows a clean extraction of the spectrum of the host galaxy diffuse light from the same slitlets as the GC targets. We show the utility of the method for investigating the kinematics and stellar populations of galaxies at radii much greater than usually probed in longslit studies, at no additional expense in terms of telescope time. To demonstrate this technique, we present Gemini South Multi-Object Spectrograph (GMOS) spectroscopy of 29 GCs associated with the elliptical galaxy NGC 3923. We compare the measured stellar population parameters of the GC system with those of the spheroid of NGC 3923 at the same projected radii, and find the GCs to have old ages >10 Gyr, [α/Fe] ∼ 0.3 and a range of metallicities running from [Z/H] = -1.8 to +0.35. The diffuse light of the galaxy is found to have ages, metallicities and [α/Fe] abundance ratios indistinguishable from those of the red GCs.
format	Articulo Articulo
author	Norris, Mark A. Sharples, Ray M. Bridges, Terry Gebhardt, Karl Forbes, Duncan A. Proctor, Robert Faifer, Favio Raúl Forte, Juan Carlos Beasley, Michael A. Zepf, Stephen E. Hanes, David A.
author_facet	Norris, Mark A. Sharples, Ray M. Bridges, Terry Gebhardt, Karl Forbes, Duncan A. Proctor, Robert Faifer, Favio Raúl Forte, Juan Carlos Beasley, Michael A. Zepf, Stephen E. Hanes, David A.
author_sort	Norris, Mark A.
title	Gemini/GMOS spectroscopy of the spheroid and globular cluster system of NGC 3923
title_short	Gemini/GMOS spectroscopy of the spheroid and globular cluster system of NGC 3923
title_full	Gemini/GMOS spectroscopy of the spheroid and globular cluster system of NGC 3923
title_fullStr	Gemini/GMOS spectroscopy of the spheroid and globular cluster system of NGC 3923
title_full_unstemmed	Gemini/GMOS spectroscopy of the spheroid and globular cluster system of NGC 3923
title_sort	gemini/gmos spectroscopy of the spheroid and globular cluster system of ngc 3923
publishDate	2008
url	http://sedici.unlp.edu.ar/handle/10915/84781
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Gemini/GMOS spectroscopy of the spheroid and globular cluster system of NGC 3923

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