Uv Spectroscopy of Extended Emission-Line Regions around QSOS

Details Uv Spectroscopy of Extended Emission-Line Regions around QSOS Uv Spectroscopy of Extended Emission-Line Regions around QSOS

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3538s&link_type=abstract

HST Proposal ID #3538

Computer Science

Hst Proposal Id #3538

Scientific paper

Studies of QSO extended emission-line regions by optical spectroscopy and narrow-band imaging show intimate connections between the presence and strength of such emission and properties such as steep-spectrum radio luminosity and strength of the classical nuclear narrow-line component. There is strong circumstantial evidence that the mechanism responsible for the presence of this extended gas may be connected to that ultimately responsible for feeding the nuclear engine that powers the QSO, so the nature of this extended emission is of considerable interest. We propose to use the FOS to observe Ly-alpha in a strong emission-line region well separated from a QSO. These data will be combined with ground-based observations of the Balmer lines in the same region. The Ly-alpha/H-alpha ratio provides an extremely sensitive diagnostic to small amounts of dust and offers a means of discriminating between the two alternative suggestions that have been made for the origin of the extended gas: debris from tidal interactions (where dust is expected at significant levels) and deposition from cooling flows (where dust will have been destroyed in the hot phase). These UV observations of a nearby QSO will also be important for comparison with current ground-based studies of extended Ly-alpha emission around high-redshift QSOs.

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