Exploring the central sub-parsec region of the γ-ray bright radio galaxy 3C 84 with VLBA at 43GHz in the period of 20022008

Kenta Suzuki, Hiroshi Nagai, Motoki Kino, Jun Kataoka, Keiichi Asada, Akihiro Doi, Makoto Inoue, Monica Orienti, Gabriele Giovannini, Marcello Giroletti, Anne Lähteenmäki, Merja Tornikoski, Jonathan León-Tavares, Uwe Bach, Seiji Kameno, Hideyuki Kobayashi

    Research output: Contribution to journalArticle

    30 Citations (Scopus)

    Abstract

    Following the discovery of a new radio component right before the GeV γ-ray detection since 2008 August by the Fermi Gamma-ray Space Telescope, we present a detailed study of the kinematics and light curve on the central sub-parsec scale of 3C 84 using the archival Very Long Baseline Array 43GHz data covering the period between 2002 January and 2008 November. We find that the new component "C3," previously reported by the observations with the Very Long Baseline Interferometer Exploration of Radio Astrometry, was already formed in 2003. The flux density of C3 increases moderately until 2008, and then it becomes brighter rapidly after 2008. The radio core, C1, also shows a similar trend. The apparent speed of C3 with reference to the core C1 shows moderate acceleration from 0.10c to 0.47c between 2003 November and 2008 November, but is still sub-relativistic. We further try to fit the observed broadband spectrum by the one-zone synchrotron self-Compton model using the measured apparent speed of C3. The fit can reproduce the observed γ-ray emission, but does not agree with the observed radio spectral index between 22 and 43GHz.

    Original languageEnglish
    Article number140
    JournalAstrophysical Journal
    Volume746
    Issue number2
    DOIs
    Publication statusPublished - 2012 Feb 20

    Fingerprint

    radio galaxies
    rays
    radio
    Very Long Baseline Array (VLBA)
    Fermi Gamma-ray Space Telescope
    astrometry
    light curve
    synchrotrons
    coverings
    kinematics
    interferometers
    flux density
    broadband
    trends
    curves
    interferometer
    speed

    Keywords

    • galaxies: active
    • galaxies: individual (NGC 1275, Perseus A, 3C 84)
    • galaxies: jets
    • gamma rays: galaxies

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Exploring the central sub-parsec region of the γ-ray bright radio galaxy 3C 84 with VLBA at 43GHz in the period of 20022008. / Suzuki, Kenta; Nagai, Hiroshi; Kino, Motoki; Kataoka, Jun; Asada, Keiichi; Doi, Akihiro; Inoue, Makoto; Orienti, Monica; Giovannini, Gabriele; Giroletti, Marcello; Lähteenmäki, Anne; Tornikoski, Merja; León-Tavares, Jonathan; Bach, Uwe; Kameno, Seiji; Kobayashi, Hideyuki.

    In: Astrophysical Journal, Vol. 746, No. 2, 140, 20.02.2012.

    Research output: Contribution to journalArticle

    Suzuki, K, Nagai, H, Kino, M, Kataoka, J, Asada, K, Doi, A, Inoue, M, Orienti, M, Giovannini, G, Giroletti, M, Lähteenmäki, A, Tornikoski, M, León-Tavares, J, Bach, U, Kameno, S & Kobayashi, H 2012, 'Exploring the central sub-parsec region of the γ-ray bright radio galaxy 3C 84 with VLBA at 43GHz in the period of 20022008', Astrophysical Journal, vol. 746, no. 2, 140. https://doi.org/10.1088/0004-637X/746/2/140
    Suzuki, Kenta ; Nagai, Hiroshi ; Kino, Motoki ; Kataoka, Jun ; Asada, Keiichi ; Doi, Akihiro ; Inoue, Makoto ; Orienti, Monica ; Giovannini, Gabriele ; Giroletti, Marcello ; Lähteenmäki, Anne ; Tornikoski, Merja ; León-Tavares, Jonathan ; Bach, Uwe ; Kameno, Seiji ; Kobayashi, Hideyuki. / Exploring the central sub-parsec region of the γ-ray bright radio galaxy 3C 84 with VLBA at 43GHz in the period of 20022008. In: Astrophysical Journal. 2012 ; Vol. 746, No. 2.
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    AU - Kataoka, Jun

    AU - Asada, Keiichi

    AU - Doi, Akihiro

    AU - Inoue, Makoto

    AU - Orienti, Monica

    AU - Giovannini, Gabriele

    AU - Giroletti, Marcello

    AU - Lähteenmäki, Anne

    AU - Tornikoski, Merja

    AU - León-Tavares, Jonathan

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    KW - gamma rays: galaxies

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