Mid-UV SNAPSHOT Survey of Nearby Irregulars: Galaxy Structure and Evolution Benchmark

Details Mid-UV SNAPSHOT Survey of Nearby Irregulars: Galaxy Structure and Evolution Benchmark Mid-UV SNAPSHOT Survey of Nearby Irregulars: Galaxy Structure and Evolution Benchmark

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9124w&link_type=abstract

HST Proposal ID #9124

Mathematics

Logic

Hst Proposal Id #9124 Galaxies

Scientific paper

Too little is known about the relation between star formation and the global physical characteristics of galaxies to interpret the morphologies of distant galaxies in terms of their evolutionary status. Distant galaxies are primarily observed by HST in their restframe mid-ultraviolet { 3000Angstrom }. They resemble nearby late-type galaxies, but are they really physically similar classes of objects? We propose to address this question through a SNAPSHOT survey in the WFPC2 mid-UV filter F300W {2930Angstrom } of 98 nearby late-type, irregular and peculiar galaxies. These are thus far missing from the Archive and Cycle 9 samples. Our sample is carefully selected for size and surface brightness to be doable in SNAPSHOTS. We have been collecting ground-based UBVRIJHK images for a variety of these objects. The mid-UV is the missing keystone. Our proposed data set will be unique, can be applied to a wide range of problems, and will be made public immediately. Our goals are: 1. Consistently classify polychromatic structures and photometric properties of nearby late-types from 0.29-2.2 Mu, providing a local benchmark that we can redshift to z 1->2 for quantitative comparison to the morphological and photometric properties of high redshift galaxies; 2. Map the spatial distribution, luminosities, and sizes of star forming regions responsible for the UV morphology, and relate these to global galaxy properties.

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