We present the results of Very Long Baseline Interferometry (VLBI) observations using the phase reference technique to detect weak Active Galactic Nuclei (AGN) cores in the Virgo cluster. Our observations were carried out using the Korean VLBI Network (KVN). We have selected eight representative radio galaxies, seven Virgo cluster members and one galaxy (NGC 4261) that is likely to be in the background. The selected galaxies are located in a range of density regions showing various morphology in 1.4 GHz continuum. Since half of our targets are too weak to be detected at K-band we applied a phase referencing technique to extend the source integration time by calibrating atmospheric phase fluctuations. We discuss the results of the phase referencing method at high frequency observations and we compare them with self-calibration on the relatively bright AGNs, such as M87, M84 and NGC 4261. In this manuscript we present the radio intensity maps at 22 GHz of the Virgo cluster sample while we demonstrate for first time the capability of KVN phase referencing technique.


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    Title :

    Demonstration of KVN phase referencing capability



    Published in:

    Publication date :

    2015




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    55.60 Raumfahrttechnik / 50.93 / 55.60 / 50.93 Weltraumforschung



    Demonstration of KVN phase referencing capability

    Tremou, Evangelia / Jung, Taehyun / Chung, Aeree et al. | Elsevier | 2015


    Referencing

    Papalambros, Panos Y. | Online Contents | 2011


    Characterizing Phase Noise in Self-Referencing Radar

    van der Walt, Pieter W. / Steyn, Werner | IEEE | 2023


    Precision Spacecraft Tracking Using In-Beam Phase Referencing

    Majid, Walid A. / Bagri, Durgadas S. | IEEE | 2008


    Dynamic Location Referencing Strands

    FOWE JAMES | European Patent Office | 2016

    Free access