Computer Science – Performance
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5849b&link_type=abstract
HST Proposal ID #5849
Computer Science
Performance
Hst Proposal Id #5849 Quasars
Scientific paper
The imaging of nearby quasars in oder to measure the characteristics of theirpresumed bright host galaxies was one of the scientific goals used to setperformance standards during the design and development of the HST. Thesurprising first results from our systematic program to determine host-galaxycharacteristics are not consistent with the standard picture, assumed in thedesign standards, that quasars occur in well-developed, luminous (L^* orbrighter) galaxies. No bright host galaxies were found for any of the 8luminous quasars we have studied. For this proposal, 4-orbit exploratoryexposures will be taken of the "cleanest" quasar for which the only candidatenebulosity detected in Cycle 4 was extremely faint. These observations willdetect or set limits on host galaxies about as faint as the LMC. For 3 otherquasars, the reality of possible faint nebulosity, including three candidatefaint host galaxies, will be tested using single-orbit observations at rollangles different from those used in Cycle 4; these observations will measurethe absolute magnitudes, the sizes, and the shapes of any host galaxy materialfound. The proposed observations will also determine the projected spacedensity of companion galaxies near (but physically distinct from) the quasars.
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