Using a semi-analytic accretion-flow model and ray tracing, the paper classifies nearby supermassive black holes by the frequency at which their shadows become visible, identifying optimal bands for future VLBI imaging.
Parsec-scale structures of radio galaxies in the 2-Jy sample
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abstract
In this paper we present the results of VLBI observations of six radio galaxies belonging to the 2-Jy sample. The selected objects are 3C17, PKS 0620-52, PKS 0625-35, PKS 1318-43, PKS 1333-33 and 3C317. The first is a high power radio galaxy and the remainder are low power objects. Our observations were carried out with a set of different arrays and frequencies, and cover a range of resolutions from a few mas to a few tens of mas. Parsec-scale images are presented and discussed in the light of unification for radio loud galaxies. Estimates for the intrinsic plasma speed in these objects in the proximity of the parsec-scale core and tehir orientation to the line of sight are in agreement with the predictions from unified models and their optical and X-ray properties.
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Modeling Targets and Optimal Frequencies for Imaging the Shadows of Nearby Supermassive Black Holes
Using a semi-analytic accretion-flow model and ray tracing, the paper classifies nearby supermassive black holes by the frequency at which their shadows become visible, identifying optimal bands for future VLBI imaging.