Measuring the core shift effect in AGN jets with the extended Korean VLBI network

T. Jung, Richard Dodson, S.T. Han, Maria Rioja Capellan, D.Y. Byun, M. Honma, J. Stevens, P. De Vicente, B.W. Sohn

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    8 Citations (Scopus)


    © 2015. The Korean Astronomical Society. All rights reserved. We present our efforts for extending the simultaneous multi-frequency receiver system of the Korean Very Long Baseline Interferometry (VLBI) Network (KVN) to global baselines in order to measure the frequency-dependent position shifts in Active Galactic Nuclei (AGN) jets, the so called core shift effect, with an unprecedented accuracy (a few micro-arcseconds). Millimeter VLBI observations with simultaneous multi-frequency receiver systems, like those of the KVN, enable us to explore the innermost regions of AGN and high precision astrometry. Such a system is capable of locating the frequency dependent opacity changes accurately. We have conducted the feasibility test-observations with the interested partners by implementing the KVN-compatible systems. Here we describe the science case for measuring the core shift effect in the AGN jet and report progress and future plans on extending the simultaneous multi-frequency system to global baselines.
    Original languageEnglish
    Pages (from-to)277-284
    JournalJournal of the Korean Astronomical Society
    Issue number5
    Publication statusPublished - 2015


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