Milliarcsecond-scale spectral properties and jet motions in M 87

Richard Dodson, P.G. Edwards, H. Hirabayashi

    Research output: Contribution to journalArticlepeer-review

    37 Citations (Web of Science)


    We have combined high resolution VLBI Space Observatory Programme (VSOP) data at 1.6 and 4.8 GHz with Very Long Baseline Array (VLBA) data at higher frequencies and with similar resolutions to study the spectral properties of the core of M 87 with milliarcsec resolution. The VSOP data allows a more accurate measurement of the turnover frequency, and hence more reliable determination of associated physical parameters of the source. Comparison of the images with previously published images yields no evidence for significant motions of components in the parsec-scale jet. In addition, the brightness temperatures obtained from modelfits to the core are well below the inverse Compton limit, suggesting that the radio emission we are observing is not strongly Doppler boosted.
    Original languageEnglish
    Pages (from-to)243-251
    JournalPublications of the Astronomical Society of Japan
    Issue number2
    Publication statusPublished - 2006


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