- [*] A young stellar cluster in the nucleus of NGC 4449
- Boeker T., van der Marel R.P., Mazzuca L., Rix H.W., Rudnick G.,
Ho L., Shields J.
- AJ, 121, 1473-1481, 2001
this paper in the ADS
We have obtained 1-2 Angstrom resolution optical Echellette spectra of
the nuclear star cluster in the nearby starburst galaxy NGC 4449. The
light is clearly dominated by a very young (6-10 Myr) population of
stars. For our age dating, we have used recent population synthesis
models to interpret the observed equivalent width of stellar
absorption features such as the HI Balmer series and the Ca II triplet
around 8500 Angstrom. We also compare the observed spectrum of the
nuclear cluster to synthesized spectra for stellar populations of
varying ages. All these approaches yield a consistent cluster
age. Metallicity estimates based on the relative intensities of
various ionization lines yield no evidence for significant enrichment
in the center of this low mass galaxy: the metallicity of the nuclear
cluster is about one fourth of the solar value, in agreement with
independent estimates for the disk material of NGC 4449.
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Last modified September 1, 2001.
Roeland van der Marel,