VLBI monitoring of 3C 84 (NGC 1275) in early phase of the 2005 outburst

Hiroshi Nagai, Kenta Suzuki, Keiichi Asada, Motoki Kino, Seiji Kameno, Akihiro Doi, Makoto Inoue, Jun Kataoka, Uwe Bach, Tomoya Hirota, Naoko Matsumoto, Mareki Honma, Hideyuki Kobayashi, Kenta Fujisawa

    Research output: Contribution to journalArticle

    39 Citations (Scopus)

    Abstract

    Multi-epoch Very Long Baseline Interferometry (VLBI) study of a sub-pc scale jet of 3C 84 is presented. We carried out 14-epoch VLBI observations during 2006-2009 with the Japanese VLBI Network and the VLBI Exploration of Radio Astrometry, immediately following a radio outburst that began in 2005. We confirmed that the outburst was associated with the central &tild; 1 pc core, accompanying the emergence of a new component. This is striking evidence of the recurrence of jet activity. The new component became brighter during 2008, in contrast to constant γ-ray emission that was observed with the Fermi Gamma-ray Space Telescope during the same time. We found that the projected speed of the new component was 0.23 c from 2007/297 (2007 October 24) to 2009/114 (2009 April 24). The direction of movement of this component differs from that of the pre-existing component by &tild;40°. This was the first measurement of the kinematics of a sub-pc jet in a γ-ray active phase. A possible detection of jet deceleration and the jet kinematics in connection with the γ-ray emission is discussed.

    Original languageEnglish
    JournalPublications of the Astronomical Society of Japan
    Volume62
    Issue number2
    Publication statusPublished - 2010 Apr 25

    Fingerprint

    very long baseline interferometry
    outburst
    interferometry
    monitoring
    rays
    kinematics
    time measurement
    radio
    Fermi Gamma-ray Space Telescope
    astrometry
    deceleration

    Keywords

    • Galaxies: active
    • Galaxies: individual (3C 84, NGC 1275)
    • Galaxies: jets
    • Radio continuum: galaxies

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Nagai, H., Suzuki, K., Asada, K., Kino, M., Kameno, S., Doi, A., ... Fujisawa, K. (2010). VLBI monitoring of 3C 84 (NGC 1275) in early phase of the 2005 outburst. Publications of the Astronomical Society of Japan, 62(2).

    VLBI monitoring of 3C 84 (NGC 1275) in early phase of the 2005 outburst. / Nagai, Hiroshi; Suzuki, Kenta; Asada, Keiichi; Kino, Motoki; Kameno, Seiji; Doi, Akihiro; Inoue, Makoto; Kataoka, Jun; Bach, Uwe; Hirota, Tomoya; Matsumoto, Naoko; Honma, Mareki; Kobayashi, Hideyuki; Fujisawa, Kenta.

    In: Publications of the Astronomical Society of Japan, Vol. 62, No. 2, 25.04.2010.

    Research output: Contribution to journalArticle

    Nagai, H, Suzuki, K, Asada, K, Kino, M, Kameno, S, Doi, A, Inoue, M, Kataoka, J, Bach, U, Hirota, T, Matsumoto, N, Honma, M, Kobayashi, H & Fujisawa, K 2010, 'VLBI monitoring of 3C 84 (NGC 1275) in early phase of the 2005 outburst', Publications of the Astronomical Society of Japan, vol. 62, no. 2.
    Nagai H, Suzuki K, Asada K, Kino M, Kameno S, Doi A et al. VLBI monitoring of 3C 84 (NGC 1275) in early phase of the 2005 outburst. Publications of the Astronomical Society of Japan. 2010 Apr 25;62(2).
    Nagai, Hiroshi ; Suzuki, Kenta ; Asada, Keiichi ; Kino, Motoki ; Kameno, Seiji ; Doi, Akihiro ; Inoue, Makoto ; Kataoka, Jun ; Bach, Uwe ; Hirota, Tomoya ; Matsumoto, Naoko ; Honma, Mareki ; Kobayashi, Hideyuki ; Fujisawa, Kenta. / VLBI monitoring of 3C 84 (NGC 1275) in early phase of the 2005 outburst. In: Publications of the Astronomical Society of Japan. 2010 ; Vol. 62, No. 2.
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    abstract = "Multi-epoch Very Long Baseline Interferometry (VLBI) study of a sub-pc scale jet of 3C 84 is presented. We carried out 14-epoch VLBI observations during 2006-2009 with the Japanese VLBI Network and the VLBI Exploration of Radio Astrometry, immediately following a radio outburst that began in 2005. We confirmed that the outburst was associated with the central &tild; 1 pc core, accompanying the emergence of a new component. This is striking evidence of the recurrence of jet activity. The new component became brighter during 2008, in contrast to constant γ-ray emission that was observed with the Fermi Gamma-ray Space Telescope during the same time. We found that the projected speed of the new component was 0.23 c from 2007/297 (2007 October 24) to 2009/114 (2009 April 24). The direction of movement of this component differs from that of the pre-existing component by &tild;40°. This was the first measurement of the kinematics of a sub-pc jet in a γ-ray active phase. A possible detection of jet deceleration and the jet kinematics in connection with the γ-ray emission is discussed.",
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    AU - Kameno, Seiji

    AU - Doi, Akihiro

    AU - Inoue, Makoto

    AU - Kataoka, Jun

    AU - Bach, Uwe

    AU - Hirota, Tomoya

    AU - Matsumoto, Naoko

    AU - Honma, Mareki

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    AU - Fujisawa, Kenta

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    N2 - Multi-epoch Very Long Baseline Interferometry (VLBI) study of a sub-pc scale jet of 3C 84 is presented. We carried out 14-epoch VLBI observations during 2006-2009 with the Japanese VLBI Network and the VLBI Exploration of Radio Astrometry, immediately following a radio outburst that began in 2005. We confirmed that the outburst was associated with the central &tild; 1 pc core, accompanying the emergence of a new component. This is striking evidence of the recurrence of jet activity. The new component became brighter during 2008, in contrast to constant γ-ray emission that was observed with the Fermi Gamma-ray Space Telescope during the same time. We found that the projected speed of the new component was 0.23 c from 2007/297 (2007 October 24) to 2009/114 (2009 April 24). The direction of movement of this component differs from that of the pre-existing component by &tild;40°. This was the first measurement of the kinematics of a sub-pc jet in a γ-ray active phase. A possible detection of jet deceleration and the jet kinematics in connection with the γ-ray emission is discussed.

    AB - Multi-epoch Very Long Baseline Interferometry (VLBI) study of a sub-pc scale jet of 3C 84 is presented. We carried out 14-epoch VLBI observations during 2006-2009 with the Japanese VLBI Network and the VLBI Exploration of Radio Astrometry, immediately following a radio outburst that began in 2005. We confirmed that the outburst was associated with the central &tild; 1 pc core, accompanying the emergence of a new component. This is striking evidence of the recurrence of jet activity. The new component became brighter during 2008, in contrast to constant γ-ray emission that was observed with the Fermi Gamma-ray Space Telescope during the same time. We found that the projected speed of the new component was 0.23 c from 2007/297 (2007 October 24) to 2009/114 (2009 April 24). The direction of movement of this component differs from that of the pre-existing component by &tild;40°. This was the first measurement of the kinematics of a sub-pc jet in a γ-ray active phase. A possible detection of jet deceleration and the jet kinematics in connection with the γ-ray emission is discussed.

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