Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7896b&link_type=abstract
HST Proposal ID #7896
Mathematics
Logic
Hst Proposal Id #7896 Galaxies
Scientific paper
We propose to obtain NICMOS snapshot images for a sample of 50 ultraluminous IR galaxies at H {F160W}. These will be matched with our equivalent-resolution WFPC2 Cycle 6 I-band {F814W} observations to produce multi-color images of these remarkable starbursting systems over a wide wavelength baseline and to probe through a significant fraction of the dust obscuration that plagues the shorter wavelength images. A sub-sample of our 50 galaxies consists of objects for which we are obtaining comprehensive spectral coverage: we are already acquiring photometry in the wavelength range 4-200 microns with the Infrared Space Observatory {ISO} and we are planning further observations at other wavelengths. The multi-color HST images obtained for our total sample will allow for the first time a detailed spatial decomposition of subarcsecond structures within these morphologically rich galaxies into separate components arising from starlight, dust emission, and/or dust extinction. In particular, we will study the galaxies' cores, map the spatial distribution of starburst activity, and search for nuclear bars, bright active nuclei, large H II complexes, and young star clusters of the type seen in HST observations of similar objects. Nearly all of these galaxies show evidence for a recent tidal interaction, and we will search for evidence of the merger progenitors near the center of each galaxy, a task made significantly easier with NIR imaging.
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