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

doi:10.1093/pasj/62.2.L11

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

^*Corresponding author for this work

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

62 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 language	English
Pages (from-to)	L11-L15
Journal	Publications of the Astronomical Society of Japan
Volume	62
Issue number	2
DOIs	https://doi.org/10.1093/pasj/62.2.L11
Publication status	Published - 2010 Apr 25

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

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10.1093/pasj/62.2.L11

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

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.",

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

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

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T1 - VLBI monitoring of 3C 84 (NGC 1275) in early phase of the 2005 outburst

AU - Nagai, Hiroshi

AU - Suzuki, Kenta

AU - Asada, Keiichi

AU - Kino, Motoki

AU - Kameno, Seiji

AU - Doi, Akihiro

AU - Inoue, Makoto

AU - Kataoka, Jun

AU - Bach, Uwe

AU - Hirota, Tomoya

AU - Matsumoto, Naoko

AU - Honma, Mareki

AU - Kobayashi, Hideyuki

AU - Fujisawa, Kenta

PY - 2010/4/25

Y1 - 2010/4/25

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.

KW - Galaxies: active

KW - Galaxies: individual (3C 84, NGC 1275)

KW - Galaxies: jets

KW - Radio continuum: galaxies

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

Abstract

Keywords

ASJC Scopus subject areas

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