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    ATCA monitoring of gamma-ray loud AGN

    258720.pdf (301.6Kb)
    Access Status
    Open access
    Authors
    Stevens, J.
    Edwards, P.
    Ojha, R.
    Kadler, M.
    Hungwe, F.
    Dutka, M.
    Tingay, S.
    Macquart, Jean-Pierre
    Moin, A.
    Lovell, J.
    Blanchard, J.
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Stevens, J. and Edwards, P. and Ojha, R. and Kadler, M. and Hungwe, F. and Dutka, M. and Tingay, S. et al. 2012. ATCA monitoring of gamma-ray loud AGN. eConf C1111101.
    School
    School of Electrical Engineering, Computing and Mathematical Science (EECMS)
    URI
    http://hdl.handle.net/20.500.11937/59858
    Collection
    • Curtin Research Publications
    Abstract

    As a critical part of the Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry (TANAMI) program, in November 2007 the Australia Telescope Compact Array (ATCA) started monitoring the radio spectra of a sample of southern hemisphere active galactic nuclei (AGN) that were selected as likely candidates for detection (as well as a control sample) by the Large Area Telescope (LAT) aboard the Fermi Gamma Ray Space Observatory. The initial sample was chosen based on properties determined from AGN detections by the Energetic Gamma Ray Experiment Telescope (EGRET). Most of the initial sample has been detected by Fermi/LAT and with the addition of new detections the sample has grown to include 226 AGN, 133 of which have data for more than one epoch. For the majority of these AGN, our monitoring program provides the only dynamic radio spectra available. The ATCA receiver suite makes it possible to observe several sources at frequencies between 4.5 and 41 GHz in a few hours, resulting in an excellent measure of spectral index at each epoch. By examining how the spectral index changes over time, we aim to investigate the mechanics of radio and gamma-ray emission from AGN jets.

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