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    Parsec-scale shocks in the kiloparsec-scale jet of Centaurus A

    Access Status
    Open access via publisher
    Authors
    Tingay, Steven
    Lenc, E.
    Date
    2009
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Tingay, S. J. and Lenc, E. 2009. Parsec-scale shocks in the kiloparsec-scale jet of Centaurus A. The Astronomical Journal. 138 (3): pp. 808-812.
    Source Title
    The Astronomical Journal
    DOI
    10.1088/0004-6256/138/3/808
    ISSN
    0004-6256
    Faculty
    Faculty of Science and Engineering
    Curtin Institute of Radio Astronomy
    Remarks

    © Institute of Physics (the “Institute”) and IOP Publishing 2009.

    URI
    http://hdl.handle.net/20.500.11937/6984
    Collection
    • Curtin Research Publications
    Abstract

    High angular resolution very long baseline interferometry (VLBI) observations of Centaurus A have been undertaken that allow access to a wide field of view, encompassing both the well-studied parsec-scale jet and the inner part of the kiloparsec-scale jet. The VLBI observations have detected compact regions of synchrotron emission in the kiloparsec-scale jet that coincide with three stationary features identified from previous VLA monitoring observations. Each of these stationary features is associated with strong localized X-ray emission. The VLBI results strengthen arguments made by previous authors suggesting that the stationary features may be the result of stellar objects or gas clouds traversing the jet flow, intercepting the jet and causing strong shocks. The VLBI data show that the most strongly shocked regions in these features are resolved but have extents no larger than a few pc, reducing the required mass of the typical intercepting object by a factor of -10 relative to previous estimates, making explanations based on high mass-loss stars or low-density gas clouds more plausible.

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