Velocity dispersion measurements of dwarf galaxies in the Coma cluster – implications for the structure of the fundamental plane
Identifieur interne : 000115 ( Main/Exploration ); précédent : 000114; suivant : 000116Velocity dispersion measurements of dwarf galaxies in the Coma cluster – implications for the structure of the fundamental plane
Auteurs : A. M. Cody [Australie, États-Unis] ; D. Carter ; T. J. Bridges [Australie, Canada] ; B. Mobasher [États-Unis] ; B. M. Poggianti [Italie]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2009-07-01.
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Abstract
We present intermediate‐resolution spectroscopic data for a set of dwarf and giant galaxies in the Coma cluster, with −20.6 < MR < −15.7. The photometric and kinematic properties of the brighter galaxies can be cast in terms of parameters which present little scatter with respect to a set of scaling relations known as the fundamental plane. To determine the form of these fundamental scaling relations at lower luminosities, we have measured velocity dispersions for a sample comprising 69 galaxies on the border of the dwarf and giant regime. Combining these data with our photometric survey, we find a tight correlation of luminosity and velocity dispersion, L∝σ2.0, substantially flatter than the Faber–Jackson relation characterizing giant elliptical galaxies. In addition, the variation of mass‐to‐light (M/L) ratio with velocity dispersion is quite weak in our dwarf sample: M/L∝σ0.2. Our overall results are consistent with theoretical models invoking large‐scale mass removal and subsequent structural readjustment, e.g. as a result of galactic winds.
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DOI: 10.1111/j.1365-2966.2009.14826.x
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