Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6057s&link_type=abstract
HST Proposal ID #6057
Computer Science
Hst Proposal Id #6057 Agn
Scientific paper
A Cycle 1 pilot programme using the FGS to achieve ultra-high spatial resolution has been successful. We wish to follow up this work, studying the morphologies of AGNs on scales of tens of milliarcseconds. Several exciting problems concerning AGNs and their jets can be tackled uniquely by such observations -- the relation of optical continuum in AGNs to synchrotron jets, the detection of superluminal jet expansion in the optical, and spatially resolving the broad-line region. We have observed 3C279 with the FGS and found it to have optical structure on the scale of 40 milliarcseconds with additional components about 0.1 arcsec away along the position angle of the jet; hints of extent have also been seen in WFPC2 observations. We wish to study this structure in more detail and, in particular, search for optical superluminal motion, already known to exist in the radio. We will do this by repeating the FGS observations of 3C279 to look for time variable phenomena, by scanning in different directions to better study the small-scale spatial morphology, and by using the FOC to study the detailed morphology of the central region on the "larger" scales of 50-100 milliarcseconds, also using this latter data as a model for our FGS fitting. Our observations will provide information about nuclear structure on a scale of a few parsecs, measure the luminosity of a point-like component, and constrain the properties of a possible black hole.
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