Structural Parameters and Dynamical Masses for Globular Clusters in M33

Details Structural Parameters and Dynamical Masses for Globular Clusters in M33 Structural Parameters and Dynamical Masses for Globular Clusters in M33

2002-08-07

arxiv.org/abs/astro-ph/0208169v1

Astronomy and Astrophysics

Astrophysics

25 pages, including 7 figures and 4 tables. Accepted for AJ, Nov 2002

Scientific paper

10.1086/344110

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.

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