Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· SIMBAD Objects (1)
· Reads History
·
· Translate This Page
Title:
Super Star Clusters in M82: Young Globular Clusters?
Authors:
McCrady, N.; Gilbert, A. M.; Graham, J. R.
Affiliation:
AA(UC Berkeley), AB(UC Berkeley), AC(UC Berkeley)
Publication:
American Astronomical Society, 201st AAS Meeting, #81.03; Bulletin of the American Astronomical Society, Vol. 34, p.1238
Publication Date:
12/2002
Origin:
AAS
Bibliographic Code:
2002AAS...201.8103M

Abstract

Using high-resolution (R ~ 22,000) near-infrared (1.51 μ m <λ < 1.75 μ m) spectra from Keck Observatory, we measure the kinematic masses of two super star clusters (SSCs) in M82. Cross-correlation of the spectra with template spectra of cool evolved stars gives stellar velocity dispersions of 16.2 +/- 0.8 km/s for cluster MGG-9 and 11.3 +/- 0.7 km/s for cluster MGG-11. The cluster spectra are dominated by the light of red supergiants, and correlate most closely with a template star of spectral type M0Iab. King model fits to the observed profiles of the clusters in archival HST/NICMOS images give half-light radii of 2.6 +/- 0.2 pc for MGG-9 and 1.15 +/- 0.09 pc for MGG-11. Applying the Virial theorem, we determine masses of 1.6 +/- 0.3 x 106 Msun for MGG-9 and 3 +/- 1 x 105 Msun for MGG-11. The sizes, masses, velocity dispersions, profiles and ages of the clusters suggest that these SSCs may represent globular clusters forming in the present-day universe.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints