Structural Parameters and Dynamical Masses for Globular Clusters in M33
Abstract
Using high-dispersion spectra from the HIRES echelle spectrograph on the Keck I telescope, we measure velocity dispersions for 4 globular clusters in M33. Combining the velocity dispersions with integrated photometry and structural parameters derived from King-Michie model fits to WFPC2 images, we obtain mass-to-light ratios for the clusters. The mean value is M/LV = 1.53 +/- 0.18, very similar to the M/LV of Milky Way and M31 globular clusters. The M33 clusters also fit very well onto the fundamental plane and binding energy - luminosity relations derived for Milky Way GCs. Dynamically and structurally, the four M33 clusters studied here appear virtually identical to Milky Way and M31 GCs.
Cite
@article{arxiv.astro-ph/0208169,
title = {Structural Parameters and Dynamical Masses for Globular Clusters in M33},
author = {S. S. Larsen and J. P. Brodie and A. Sarajedini and J. P. Huchra},
journal= {arXiv preprint arXiv:astro-ph/0208169},
year = {2009}
}
Comments
25 pages, including 7 figures and 4 tables. Accepted for AJ, Nov 2002