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HST and Keck Observations of a Young Globular Cluster in the Spiral Galaxy NGC 6946

  • Søren S. Larsen (a1), Jean P. Brodie (a1), Bruce G. Elmegreen (a2), Yuri N. Efremov (a3), Paul W. Hodge (a4) and Tom Richtler (a5)...

Abstract

Using new (Cycle 9) HST / WFPC2 data, we have studied a peculiar star forming region in the nearby Sc-type spiral NGC 6946. The region has a bubble-like shape and a diameter of about 600 pc. Near the centre is an extremely luminous young globular cluster with M V = −13.2 mag. The cluster has a compact core with a core radius of about 1.3 pc but is surrounded by an extended halo with a power-law luminosity profile similar to that observed for young LMC clusters. From Keck / HIRES high-dispersion spectroscopy we measure a velocity dispersion of 10 km s−1, leading to a dynamical mass estimate of about 1.7 × 106 solar masses. The dynamical mass estimate is comparable to the expectation from population synthesis modelling under the assumption of a Salpeter IMF extending down to 0.1 M.

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References

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Bruzual, G. A. & Chariot, S. 1996, unpublished
Elmegreen, B. G., Efremov, Y. N., Larsen, S. S. 2000, ApJ, 535, 748
Ho, L. C. & Filippenko, A. V. 1996, ApJ, 472, 600
Hodge, P. W. 1967, PASP, 79, 29
Larsen, S. S., & Richtler, T. 1999, A&A, 345, 59
Larsen, S. S., Brodie, J. P., Elmegreen, B. G. et al. 2001, ApJ, 556, 801

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