Journal Article

Velocity dispersion measurements of dwarf galaxies in the Coma cluster – implications for the structure of the fundamental plane

A. M. Cody, D. Carter, T. J. Bridges, B. Mobasher and B. M. Poggianti

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 3, pages 1647-1658
Published in print July 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14826.x
Velocity dispersion measurements of dwarf galaxies in the Coma cluster – implications for the structure of the fundamental plane

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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.

Keywords: galaxies: clusters: individual: Coma; galaxies: dwarf; galaxies: elliptical and lenticular, cD; galaxies: evolution; galaxies: fundamental parameters; galaxies: kinematics and dynamics

Journal Article.  8630 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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