paper

Dynamical Evidence for a Luminous, Young Globular Cluster in NGC 1569

arXiv:astro-ph/9605189 · doi:10.1086/310181

Abstract

Recent high-resolution observations with the Hubble Space Telescope (HST) reveal that star clusters of extraordinary luminosity and compactness are commonly found in a variety of starburst systems. There has been much speculation that these clusters represent present-day analogs of young globular clusters. Using the HIRES echelle spectrograph on the Keck 10 m telescope, we obtained high-dispersion optical spectra of one of the ``super star clusters'' (cluster ``A'') in the nearby dwarf galaxy NGC 1569. The size of the cluster is known from published HST images. The line-of-sight velocity dispersion (15.7+-1.5 km/s) has been measured from a cross-correlation analysis of its integrated spectrum at visual wavelengths. If the cluster is gravitationally bound and the velocities are isotropic, application of the virial theorem implies that the cluster has a total stellar mass of (3.3+-0.5) X 10 solar masses. This object's mass, mass density, and probable mass-to-light ratio after aging 10--15 Gyr are fully consistent with the typical values of Galactic globular clusters. Our result strongly suggests that at least some of the luminous, compact, young star clusters being discovered with {\it HST} will indeed evolve into normal globular clusters of the type seen in the Milky Way.

Accepted for publication in the Astrophysical Journal (Letters). LaTex, 11 pages including 1 postscript figure. AAStex macros included

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