In-Depth Study of The Antennae with NICMOS and ACS

Details In-Depth Study of The Antennae with NICMOS and ACS In-Depth Study of The Antennae with NICMOS and ACS

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10188w&link_type=abstract

HST Proposal ID #10188

Physics

Hst Proposal Id #10188 Galaxies

Scientific paper

We propose new observations of "The Antennae" {NGC 4038/39}, the nearest and youngest example of a major disk-disk merger, with NICMOS and ACS. The long overdue NICMOS observations will allow us to penetrate the dust in the Overlap Region, measure the P_alpha emission and CO band strengths of young clusters, and study supernova remnants in heavily obscured regions using [FeII] images. The high resolution {0.05" pixel} ACS observations will allow us for the first time to reliably distinguish clusters from stars based on their apparent sizes, and to potentially identify hundreds of supernova remnants that may control the energy balance and feedback mechanisms within the ISM {based on [SII] images}. In conjunction with our previous WFPC2, GHRS, and STIS observations, the new data will provide answers to fundamental questions such as: How do these clusters form and evolve? How quickly are they destroyed and what fraction of the field stars were formed in clusters. How many clusters are hidden by dust? How do the clusters and associated supernovae affect the local and global ISM? What are the dynamical masses of the clusters, and are the stellar IMF's truncated? Simultaneous parallel observations will also determine whether clusters can form in the more quiescent environment of the inner tails. A better understanding of how mergers form tremendous numbers of clusters and stars in the local universe will help shed light on processes that are crucial during galaxy assembly throughout the observable universe.

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