Other
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006atnf.prop..583k&link_type=abstract
ATNF proposal C1574, Semester: October, 2006
Other
Extragalactic, Atca
Scientific paper
Rapidly and strongly scintillating flat-spectum extragalactic sources are of exceptional astrophysical interest as their extremely high brightness temperatures challenge the prevailing paradigm for the energetics of AGN. They also offer the opportunity to study the physics of AGN at resolutions higher than any available, even with space VLBI. We wish to monitor (in all Stokes parameters) one of only three known extreme scintillators, PKS 0405-385, primarily to address two issues: (1) the origin of episodic scintillations seen in such sources by disentangling annual effects on observed ISM parameters due to the Earth rotation and (2) the excessive brightness temperatures of scintillating quasars. PKS 0405-385, which is currently in a scintillating phase, presents a rare opportunity to determine the evolution of a modulation index spectrum, use polarization maps to compare microarcsecond structure with earlier observations, and determine any annual cycle in the variability timescale (found in some other scintillators).
Bignall Hayley
Cimò Giuseppe
Ellingsen Simon
Jauncey David
Kedziora-Chudczer Lucyna
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