Kinematics of the Young Star Clusters and the Gas in the Antennae Galaxies

Details Kinematics of the Young Star Clusters and the Gas in the Antennae Galaxies Kinematics of the Young Star Clusters and the Gas in the Antennae Galaxies

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8170w&link_type=abstract

HST Proposal ID #8170

Computer Science

Hst Proposal Id #8170 Galaxy Populations And Interactions

Scientific paper

We propose to follow up on our discovery of over 1000 young star clusters in ``The Antennae'' {NGC 4038/4039} by obtaining long-slit and slitless spectra of a representative sample of clusters with STIS. These young clusters have the luminosities, colors, and radii expected of young globular clusters and must have formed during the ongoing merger. Because of their proximity and early stage of merging, the disks of NGC 4038/4039 form an ideal laboratory to study cluster formation in progress. While we have GHRS spectra of two bright clusters, the greater sensitivity and two- dimensional capabilities of STIS will allow us to systematically study the kinematics of the stellar and gaseous components at unprecedented spatial resolution over a large fraction of the galaxy. In particular, we will be able to determine whether the velocity dispersion of the clusters increases with age, as would be expected as the process of ``violent relaxation'' turns two disk systems into an elli ptical galaxy. In addition, more accurate measurements of ages from the long-slit spectra will provide an important consistency check on our earlier work using UBVI photometry and H Alpha imaging, and will make a variety of new studies possible {e.g., a search for evidence of propagating star formation}.

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