Other
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8686g&link_type=abstract
HST Proposal ID #8686
Other
Hst Proposal Id #8686 Galaxies
Scientific paper
Our recent ground-based imaging and spectroscopic surveys have revealed the presence of extended ionized gas with LINER spectra in a large fraction {60-70%} of early-type galaxies. In order to provide clues to the nature of this gas, we propose to obtain deep STIS far-UV images of a suitable sample of 8 nearby ellipticals and E/S0s to test in detail whether the ``UV upturn'' population in early-type galaxies {AGB-manque' stars and post-AGB stars} is a viable source of ionization for the observed ionized gas in ``normal'', radio-quiet E and E/S0 galaxies. STIS is the first and only instrument able to provide data to study the radial distribution of the UV-bright population, as its influence is expected to show up only in the central few hundred parsec. The observed radial {far-UV - optical} color gradients will be compared to detailed spectrophotometric synthesis models to deduce the number of ionizing photons and their spectral energy distribution, from which we will deduce the expected emission-line spectra and H-alpha luminosities as a function of radius. We also request narrow-band WFPC2 images for 5 galaxies in our sample to derive the central radial surface brightness profile of the H-alpha+[NII] emission which can be directly compared to the model prediction. The other 3 galaxies have such WFPC2 data already available in the archive.
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