Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6097e&link_type=abstract
HST Proposal ID #6097
Computer Science
Hst Proposal Id #6097 Agn
Scientific paper
We propose to carry out a UV spectroscopic study of a small number of nearby, radio-loud AGNs with double-peaked emission lines, in order to test competing models for the origin of the broad lines and to define the properties of the hosts in the UV. Radio-loud AGNs with double-peaked emission lines have been established as a class , with optical spectral properties reminiscent of LINERs, through the recent optical spectroscopic survey of Eracleous & Halpern (1994). Several models have been suggested to explain their unusual line profiles, but further progress in understanding the nature of these peculiar spectra is restricted by the fact that the Balmer lines are the only broad lines detected in optical spectra obtained from the ground, and the optical continuum is dominated by starlight. Observations of the UV emission lines and continuum can provide stringent tests of competing models by (1) measuring the profiles of lines from ions with different ionization potentials, and (2) measuring the non- stellar continuum, which seems different from that of most AGNs. These tests are particularly important for distinguishing between accretion disk and collimated outflow models for the origin of the double-peaked lines. If accretion disks are established as the their origin, double-peaked emission lines will provides us with the most direct view of AGN accretion disks, and will become a powerful tool for studying the disk structure and dynamics.
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