Probing the kinematics of early-type galaxy halos using planetary nebulae
Date
2008
Authors
Coccato, L
Gerhard, Ortwin
Arnaboldi, Magda
Das, P
Douglas, Nigel G
Kuijken, Konrad
Merrifield, M R
Napolitano, N. R.
Noordermeer, E
Romanowsky, A J
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Volume Title
Publisher
Wiley-VCH Verlag GMBH
Abstract
We present first results of a study of the halo kinematics for a sample of early type galaxies using planetary nebulae (PNe) as kinematical tracers. PNe allow to extend up to several effective radii (Re) the information from absorption line kinematics (confined to within 1 or 2Re), providing valuable information and constraints for merger simulations and galaxy formation models. We find that the specific angular momentum per unit mass has a more complex radial dependence when the halo region is taken into account and that the halo velocity dispersion is related to the total galaxy luminosity, isophotal shape, and number of PNe per unit of luminosity .
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Keywords
Keywords: cD; Galaxies: elliptical and lenticular; Galaxies: general; Galaxies: haloes; Galaxies: kinematics and dynamics; Planetary nebulae: general
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Source
Astronomische Nachrichten
Type
Journal article
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Restricted until
2037-12-31
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