Abstract
As part of an approved key science project for the Space Interferometry Mission (SIM), we plan to measure the position offsets between red and blue optical emission from a sample of Active Galactic Nuclei. By using differential measurements of the fringe phase between different color bands, we expect to be able to detect color-dependent astrometric offsets at the micro-arcsecond level. The blue optical continuum is dominated by thermal emission from the inner accretion disk (the source of the Big Blue Bump) in many quasar spectra. The red optical continuum is expected to be dominated by power-law non-thermal emission from the relativistic jet or from a hot corona surrounding the inner accretion disk. Our measurements of position offsets between blue and red light will allow us to determine the location of non-thermal optical emission with respect to the thermal emission from the inner accretion disk. We will also be able to monitor the astrometric stability of the optical emission centroids.
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