Cody, A. M. and Carter, D. and Bridges, T. J. and Mobasher, B. and Poggianti, B. M. (2009) Velocity dispersion measurements of dwarf galaxies in the Coma cluster – implications for the structure of the fundamental plane. Monthly Notices of the Royal Astronomical Society, 396 (3). pp. 1647-1658. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:20090806-112942157
- Published Version
Restricted to Repository administrators only
See Usage Policy.
Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20090806-112942157
We present intermediate-resolution spectroscopic data for a set of dwarf and giant galaxies in the Coma cluster, with −20.6 < M_R < −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 ∝ σ^(2.0) , 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 ∝ σ^(0.2). 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.
|Additional Information:||© 2009 RAS. Accepted 2009 March 25. Received 2009 February 18; in original form 2008 January 25. The WIYN Observatory is a joint facility of the University of Wisconsin-Madison, Indiana University, Yale University and the National Optical Astronomy Observatories. AMC acknowledges the AAO Student Fellowship Program for support of this work. We would like to thank Pat Knezek and Megan Sosey for help with the observations, as well as WIYN Hydra Instrument Scientist Diane Harmer for assistance with observing preparations. We thank the anonymous referee for helpful comments.|
|Subject Keywords:||galaxies: clusters: individual: Coma; galaxies: dwarf; galaxies: elliptical and lenticular, cD; galaxies: evolution; galaxies: fundamental parameters; galaxies: kinematics and dynamics|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||01 Sep 2009 22:09|
|Last Modified:||26 Dec 2012 11:09|
Repository Staff Only: item control page