Microarcsecond structure of an AGN Jet via Interstellar Scintillation
Hayley Bignall, Jean-Pierre Macquart, Leith Godfrey, Jeffrey Hodgson,, David Jauncey
TL;DR
This study uses broadband observations at ATCA to resolve the microarcsecond-scale core shift in an AGN jet caused by interstellar scintillation, providing insights into the jet's structure and direction.
Contribution
It presents the first measurement of the core shift at microarcsecond scales using interstellar scintillation, revealing the jet orientation in PKS 1257-326.
Findings
Resolved core shift less than 10 microarcseconds
Inferred jet direction from core shift measurements
Demonstrated the use of interstellar scintillation for microarcsecond imaging
Abstract
We have used the broadband backend available at the ATCA to study the fast interstellar scintillation of quasar PKS 1257-326, resolving the core shift as a function of frequency on scales less than 10 microarcseconds. In this short paper we discuss the jet direction implied from the microarcsecond-scale core shift in PKS 1257-326.
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