VLBI and single-dish monitoring of 3C 84 for the period 2009-2011

H. Nagai, M. Orienti, M. Kino, K. Suzuki, G. Giovannini, A. Doi, K. Asada, M. Giroletti, Jun Kataoka, F. D'Ammando, M. Inoue, A. Lähteenmäki, M. Tornikoski, J. Léon-Tavares, S. Kameno, U. Bach

    Research output: Contribution to journalArticle

    24 Citations (Scopus)

    Abstract

    The radio galaxy 3C 84 is a representative of γ -ray-bright misaligned active galactic nuclei (AGNs) and one of the best laboratories to study the radio properties of the subparsec jet in connection with the γ -ray emission. In order to identify possible radio counterparts of γ -ray emissions in 3C 84, we study the change in structure within the central 1 pc and the light curve of subparsec-sized components C1, C2 and C3. We search for any correlation between changes in the radio components and the γ -ray flares by making use of the Very Long Baseline Interferometry (VLBI) and single-dish data. Throughout the radio monitoring spanning over two GeV γ -ray flares detected by the Fermi Large Area Telescope and theMAGIC Cherenkov Telescope during 2009 April-May and 2010 June-August, the total flux density in the radio band increases on average. This flux increase mostly originates in C3. Although γ -ray flares span the time-scale of days to weeks, no clear correlation with the radio light curve on this time-scale is found. No new prominent components and change in morphology associated with the γ -ray flares are found on VLBI images.

    Original languageEnglish
    JournalMonthly Notices of the Royal Astronomical Society: Letters
    Volume423
    Issue number1
    DOIs
    Publication statusPublished - 2012 Jun

    Fingerprint

    parabolic reflectors
    very long baseline interferometry
    rays
    interferometry
    radio
    flares
    monitoring
    light curve
    telescopes
    timescale
    radio galaxies
    active galactic nuclei
    flux density

    Keywords

    • Galaxies: active
    • Galaxies: individual: 3C 84
    • Galaxies: individual: NGC 1275
    • Galaxies: jets
    • Radio Continuum: galaxies

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    VLBI and single-dish monitoring of 3C 84 for the period 2009-2011. / Nagai, H.; Orienti, M.; Kino, M.; Suzuki, K.; Giovannini, G.; Doi, A.; Asada, K.; Giroletti, M.; Kataoka, Jun; D'Ammando, F.; Inoue, M.; Lähteenmäki, A.; Tornikoski, M.; Léon-Tavares, J.; Kameno, S.; Bach, U.

    In: Monthly Notices of the Royal Astronomical Society: Letters, Vol. 423, No. 1, 06.2012.

    Research output: Contribution to journalArticle

    Nagai, H, Orienti, M, Kino, M, Suzuki, K, Giovannini, G, Doi, A, Asada, K, Giroletti, M, Kataoka, J, D'Ammando, F, Inoue, M, Lähteenmäki, A, Tornikoski, M, Léon-Tavares, J, Kameno, S & Bach, U 2012, 'VLBI and single-dish monitoring of 3C 84 for the period 2009-2011', Monthly Notices of the Royal Astronomical Society: Letters, vol. 423, no. 1. https://doi.org/10.1111/j.1745-3933.2012.01269.x
    Nagai, H. ; Orienti, M. ; Kino, M. ; Suzuki, K. ; Giovannini, G. ; Doi, A. ; Asada, K. ; Giroletti, M. ; Kataoka, Jun ; D'Ammando, F. ; Inoue, M. ; Lähteenmäki, A. ; Tornikoski, M. ; Léon-Tavares, J. ; Kameno, S. ; Bach, U. / VLBI and single-dish monitoring of 3C 84 for the period 2009-2011. In: Monthly Notices of the Royal Astronomical Society: Letters. 2012 ; Vol. 423, No. 1.
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    abstract = "The radio galaxy 3C 84 is a representative of γ -ray-bright misaligned active galactic nuclei (AGNs) and one of the best laboratories to study the radio properties of the subparsec jet in connection with the γ -ray emission. In order to identify possible radio counterparts of γ -ray emissions in 3C 84, we study the change in structure within the central 1 pc and the light curve of subparsec-sized components C1, C2 and C3. We search for any correlation between changes in the radio components and the γ -ray flares by making use of the Very Long Baseline Interferometry (VLBI) and single-dish data. Throughout the radio monitoring spanning over two GeV γ -ray flares detected by the Fermi Large Area Telescope and theMAGIC Cherenkov Telescope during 2009 April-May and 2010 June-August, the total flux density in the radio band increases on average. This flux increase mostly originates in C3. Although γ -ray flares span the time-scale of days to weeks, no clear correlation with the radio light curve on this time-scale is found. No new prominent components and change in morphology associated with the γ -ray flares are found on VLBI images.",
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    AU - Orienti, M.

    AU - Kino, M.

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    AU - Giovannini, G.

    AU - Doi, A.

    AU - Asada, K.

    AU - Giroletti, M.

    AU - Kataoka, Jun

    AU - D'Ammando, F.

    AU - Inoue, M.

    AU - Lähteenmäki, A.

    AU - Tornikoski, M.

    AU - Léon-Tavares, J.

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    KW - Galaxies: individual: NGC 1275

    KW - Galaxies: jets

    KW - Radio Continuum: galaxies

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