Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6440f&link_type=abstract
HST Proposal ID #6440
Physics
Hst Proposal Id #6440 Galaxies &Amp, Clusters
Scientific paper
We propose to image the central regions of the starburst galaxy NGC 253 using narrow and broad--band filters. With such data a variety of topics relating to the starburst can be addressed. Our primary goal is to understand the nature of the numerous discrete radio sources seen in high--resolution radio mapping of these galaxies. Considerable controversy exists over whether these radio sources are HII regions or SNRs. A number of these in M82 have recently been resolved with sizes of 50 to 300 mas. We aim to resolve many of these radio sources in the PC chip and use narrow--band imaging in the emission lines of HAlpha, SII6717+6731 and SIII9532 as a diagnostic to discriminate between HII regions and SNRs. These data will also give important information on the physical properties of the SNRs. In addition, the WFC chips will trace the warm gas associated with the large--scale superwind present in all three galaxies on small physical scales. Finally, the broad--band imaging allows us to derive color--magnitude and color-color diagrams of the central regions, from which we can measure the integrated stellar properties, identify super--star clusters and estimate the dust extinction on small scales.
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