Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7880o&link_type=abstract
HST Proposal ID #7880
Mathematics
Logic
Hst Proposal Id #7880 Galaxies
Scientific paper
The blue compact dwarf galaxy IZw18 still stands out as one of the most interesting objects at low redshift. It's heavy element abundance is the lowest ever measured in the ionized gaseous component of a galaxy. It has therefore been considered as one of the best candidates for a genuinely young galaxy. Recent WFPC2 data has revealed a truly young stellar population in the central part, with many resolved blue and red supergiants. On the other hand there have been claims that its regular halo shows that it is likely to be old. The question if galaxies can form still at the present epoch is of cosmological interest, in view of theories of galaxy and structure formation. This proposal aims at determining if IZw18 is truly young or not, by investigating the presence of old stars. We have been already been allocated 3 orbits for deep NICMOS imaging in F110W and F160W in Cycle7. Now we propose to extend this study with narrowband photometry, designed to detect C_2 features typical for carbon stars. Thereby we can discrimate between old carbon stars and young red supergiants. We will from the presence or absence of carbon stars be able to get interesting constraints on the age of this galaxy.
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