Uv Imaging of Circumnuclear Starburst Rings

Computer Science

Scientific paper

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Hst Proposal Id #6358 G&C

Scientific paper

We propose to obtain F218W WFPC images of a well defined sample of nearby galaxies with face-on circumnuclear starburst rings, and covering different levels of activity from pure starbursts to Seyfert 1 {AGNs}. These high resolution images will allow to generate for the first time an homogeneous database with the UV properties of about 60 individual circumnuclear star-forming knots. The use of the database will allow for the first time a direct and quantitative determination of basic ultraviolet properties of individual nuclear/circumnuclear star-forming knots, and of the entire starburst ring, such as: {a} their size and structure, {b} their UV luminosity function and, {c} their contribution to the UV energy output in composite AGN+starburst galaxies. The database will help in our understanding of high redshift blue galaxies, thought to be star-forming galaxies, where the flux detected in optical filters corresponds to flux emitted at UV {1500-3000Angstrom} rest frame wavelengths. The requested UV images will be combined with ROSAT/HRI images to characterize for the first time the high energy end, i.e. UV to soft X-rays, of circumnuclear starburst rings.

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