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 journalArticlepeer-review

55 Citations (Scopus)


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
Pages (from-to)L11-L15
JournalPublications of the Astronomical Society of Japan
Issue number2
Publication statusPublished - 2010 Apr 25


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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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