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    TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources

    256626.pdf (1.775Mb)
    Access Status
    Open access
    Authors
    Müller, C.
    Kadler, M.
    Ojha, R.
    Schulz, R.
    Trüstedt, J.
    Edwards, P.
    Ros, E.
    Carpenter, B.
    Angioni, R.
    Blanchard, J.
    Böck, M.
    Burd, P.
    Dörr, M.
    Dutka, M.
    Eberl, T.
    Gulyaev, S.
    Hase, H.
    Horiuchi, S.
    Katz, U.
    Krauß, F.
    Lovell, J.
    Natusch, T.
    Nesci, R.
    Phillips, C.
    Plötz, C.
    Pursimo, T.
    Quick, J.
    Stevens, J.
    Thompson, D.
    Tingay, Steven
    Tzioumis, A.
    Weston, S.
    Wilms, J.
    Zensus, J.
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Müller, C. and Kadler, M. and Ojha, R. and Schulz, R. and Trüstedt, J. and Edwards, P. and Ros, E. et al. 2018. TANAMI: Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry - II. Additional Sources. Astronomy & Astrophysics. 610: A1.
    Source Title
    Astronomy & Astrophysics
    DOI
    10.1051/0004-6361/201731455
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    Reproduced with permission from Astronomy & Astrophysics, © ESO

    URI
    http://hdl.handle.net/20.500.11937/57677
    Collection
    • Curtin Research Publications
    Abstract

    TANAMI is a multiwavelength program monitoring active galactic nuclei (AGN) south of -30deg declination including high-resolution Very Long Baseline Interferometry (VLBI) imaging, radio, optical/UV, X-ray and gamma-ray studies. We have previously published first-epoch 8.4GHz VLBI images of the parsec-scale structure of the initial sample. In this paper, we present images of 39 additional sources. The full sample comprises most of the radio- and gamma-ray brightest AGN in the southern quarter of the sky, overlapping with the region from which high-energy (>100TeV) neutrino events have been found. We characterize the parsec-scale radio properties of the jets and compare with the quasi-simultaneous Fermi/LAT gamma-ray data. Furthermore, we study the jet properties of sources which are in positional coincidence with high-energy neutrino events as compared to the full sample. We test the positional agreement of high-energy neutrino events with various AGN samples. Our observations yield the first images of many jets below -30deg declination at milliarcsecond resolution. We find that gamma-ray loud TANAMI sources tend to be more compact on parsec-scales and have higher core brightness temperatures than gamma-ray faint jets, indicating higher Doppler factors. No significant structural difference is found between sources in positional coincidence with high-energy neutrino events and other TANAMI jets. The 22 gamma-ray brightest AGN in the TANAMI sky show only a weak positional agreement with high-energy neutrinos demonstrating that the >100TeV IceCube signal is not simply dominated by a small number of the $\gamma$-ray brightest blazars. Instead, a larger number of sources have to contribute to the signal with each individual source having only a small Poisson probability for producing an event in multi-year integrations of current neutrino detectors.

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