Computer Science
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9530k&link_type=abstract
HST Proposal ID #9530
Computer Science
Hst Proposal Id #9530 Galaxies
Scientific paper
HST imagery has demonstrated that dust features are ubiquitous in galactic nuclei. The occurrence of such features has been linked to recent interactions or dynamical processes trapping the ISM in small areas against the shearing which would normally disrupt discrete such structures. In addition, many of the structures seem to be either very thick or located well above the disk plane in spirals. This proposal would support a systematic examination of the rich archival data on this question, specifically aimed at reconstruction of the three- dimensional dust structure within the nuclei. These results will allow a more complete assessment of the typical dust masses and structural scales in nuclei, which together with the galaxy dynamics, will give survival timescales for the features and imply energetics needed to maintain the observed frequency of these structures. Nonplanar dust structures will be examined particularly in a set of disturbed and merging galaxies, where they may play a significant radiative-transfer role.
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