Exploring the Connection between Parsec-scale Jet Activity and Broadband Outbursts in 3C 279

B. Rani, S. G. Jorstad, A. P. Marscher, I. Agudo, K. V. Sokolovsky, V. M. Larionov, P. Smith, D. A. Mosunova, G. A. Borman, T. S. Grishina, E. N. Kopatskaya, A. A. Mokrushina, D. A. Morozova, S. S. Savchenko, I. S. Troitsky, C. Thum, S. N. Molina, C. Casadio, Юлия Вячеславовна Троицкая

Research output

4 Citations (Scopus)

Abstract

We use a combination of high-resolution very long baseline interferometry (VLBI) radio and multiwavelength flux density and polarization observations to constrain the physics of the dissipation mechanism powering the broadband flares in 3C 279 during an episode of extreme flaring activity in 2013-2014. Six bright flares superimposed on a long-term outburst are detected at γ-ray energies. Four of the flares have optical and radio counterparts. The two modes of flaring activity (faster flares sitting on top of a long-term outburst) present at radio, optical, and γ-ray frequencies are missing in X-rays. X-ray counterparts are only observed for two flares. The first three flares are accompanied by ejection of a new VLBI component (NC2), suggesting the 43 GHz VLBI core as the site of energy dissipation. Another new component, NC3, is ejected after the last three flares, which suggests that the emission is produced upstream from the core (closer to the black hole). The study therefore indicates multiple sites of energy dissipation in the source. An anticorrelation is detected between the optical percentage polarization (PP) and optical/γ-ray flux variations, while the PP has a positive correlation with optical/γ-ray spectral indices. Given that the mean polarization is inversely proportional to the number of cells in the emission region, the PP versus optical/γ-ray anticorrelation could be due to more active cells during the outburst than at other times. In addition to the turbulent component, our analysis suggests the presence of a combined turbulent and ordered magnetic field, with the ordered component transverse to the jet axis.

Original languageEnglish
Article number80
JournalAstrophysical Journal
Volume858
Issue number2
DOIs
Publication statusPublished - 10 May 2018

Fingerprint

outburst
flares
polarization
broadband
very long baseline interferometry
rays
radio
energy dissipation
interferometry
optical polarization
dissipation
physics
cells
ejection
magnetic field
upstream
x rays
flux density
energy
high resolution

Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Rani, B. ; Jorstad, S. G. ; Marscher, A. P. ; Agudo, I. ; Sokolovsky, K. V. ; Larionov, V. M. ; Smith, P. ; Mosunova, D. A. ; Borman, G. A. ; Grishina, T. S. ; Kopatskaya, E. N. ; Mokrushina, A. A. ; Morozova, D. A. ; Savchenko, S. S. ; Troitsky, I. S. ; Thum, C. ; Molina, S. N. ; Casadio, C. ; Троицкая, Юлия Вячеславовна. / Exploring the Connection between Parsec-scale Jet Activity and Broadband Outbursts in 3C 279. In: Astrophysical Journal. 2018 ; Vol. 858, No. 2.
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abstract = "We use a combination of high-resolution very long baseline interferometry (VLBI) radio and multiwavelength flux density and polarization observations to constrain the physics of the dissipation mechanism powering the broadband flares in 3C 279 during an episode of extreme flaring activity in 2013-2014. Six bright flares superimposed on a long-term outburst are detected at γ-ray energies. Four of the flares have optical and radio counterparts. The two modes of flaring activity (faster flares sitting on top of a long-term outburst) present at radio, optical, and γ-ray frequencies are missing in X-rays. X-ray counterparts are only observed for two flares. The first three flares are accompanied by ejection of a new VLBI component (NC2), suggesting the 43 GHz VLBI core as the site of energy dissipation. Another new component, NC3, is ejected after the last three flares, which suggests that the emission is produced upstream from the core (closer to the black hole). The study therefore indicates multiple sites of energy dissipation in the source. An anticorrelation is detected between the optical percentage polarization (PP) and optical/γ-ray flux variations, while the PP has a positive correlation with optical/γ-ray spectral indices. Given that the mean polarization is inversely proportional to the number of cells in the emission region, the PP versus optical/γ-ray anticorrelation could be due to more active cells during the outburst than at other times. In addition to the turbulent component, our analysis suggests the presence of a combined turbulent and ordered magnetic field, with the ordered component transverse to the jet axis.",
keywords = "galaxies: active, galaxies: jets, gamma rays: galaxies, quasars: individual (3C 279), radio continuum: galaxies",
author = "B. Rani and Jorstad, {S. G.} and Marscher, {A. P.} and I. Agudo and Sokolovsky, {K. V.} and Larionov, {V. M.} and P. Smith and Mosunova, {D. A.} and Borman, {G. A.} and Grishina, {T. S.} and Kopatskaya, {E. N.} and Mokrushina, {A. A.} and Morozova, {D. A.} and Savchenko, {S. S.} and Troitsky, {I. S.} and C. Thum and Molina, {S. N.} and C. Casadio and Троицкая, {Юлия Вячеславовна}",
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Exploring the Connection between Parsec-scale Jet Activity and Broadband Outbursts in 3C 279. / Rani, B.; Jorstad, S. G.; Marscher, A. P.; Agudo, I.; Sokolovsky, K. V.; Larionov, V. M.; Smith, P.; Mosunova, D. A.; Borman, G. A.; Grishina, T. S.; Kopatskaya, E. N.; Mokrushina, A. A.; Morozova, D. A.; Savchenko, S. S.; Troitsky, I. S.; Thum, C.; Molina, S. N.; Casadio, C.; Троицкая, Юлия Вячеславовна.

In: Astrophysical Journal, Vol. 858, No. 2, 80, 10.05.2018.

Research output

TY - JOUR

T1 - Exploring the Connection between Parsec-scale Jet Activity and Broadband Outbursts in 3C 279

AU - Rani, B.

AU - Jorstad, S. G.

AU - Marscher, A. P.

AU - Agudo, I.

AU - Sokolovsky, K. V.

AU - Larionov, V. M.

AU - Smith, P.

AU - Mosunova, D. A.

AU - Borman, G. A.

AU - Grishina, T. S.

AU - Kopatskaya, E. N.

AU - Mokrushina, A. A.

AU - Morozova, D. A.

AU - Savchenko, S. S.

AU - Troitsky, I. S.

AU - Thum, C.

AU - Molina, S. N.

AU - Casadio, C.

AU - Троицкая, Юлия Вячеславовна

PY - 2018/5/10

Y1 - 2018/5/10

N2 - We use a combination of high-resolution very long baseline interferometry (VLBI) radio and multiwavelength flux density and polarization observations to constrain the physics of the dissipation mechanism powering the broadband flares in 3C 279 during an episode of extreme flaring activity in 2013-2014. Six bright flares superimposed on a long-term outburst are detected at γ-ray energies. Four of the flares have optical and radio counterparts. The two modes of flaring activity (faster flares sitting on top of a long-term outburst) present at radio, optical, and γ-ray frequencies are missing in X-rays. X-ray counterparts are only observed for two flares. The first three flares are accompanied by ejection of a new VLBI component (NC2), suggesting the 43 GHz VLBI core as the site of energy dissipation. Another new component, NC3, is ejected after the last three flares, which suggests that the emission is produced upstream from the core (closer to the black hole). The study therefore indicates multiple sites of energy dissipation in the source. An anticorrelation is detected between the optical percentage polarization (PP) and optical/γ-ray flux variations, while the PP has a positive correlation with optical/γ-ray spectral indices. Given that the mean polarization is inversely proportional to the number of cells in the emission region, the PP versus optical/γ-ray anticorrelation could be due to more active cells during the outburst than at other times. In addition to the turbulent component, our analysis suggests the presence of a combined turbulent and ordered magnetic field, with the ordered component transverse to the jet axis.

AB - We use a combination of high-resolution very long baseline interferometry (VLBI) radio and multiwavelength flux density and polarization observations to constrain the physics of the dissipation mechanism powering the broadband flares in 3C 279 during an episode of extreme flaring activity in 2013-2014. Six bright flares superimposed on a long-term outburst are detected at γ-ray energies. Four of the flares have optical and radio counterparts. The two modes of flaring activity (faster flares sitting on top of a long-term outburst) present at radio, optical, and γ-ray frequencies are missing in X-rays. X-ray counterparts are only observed for two flares. The first three flares are accompanied by ejection of a new VLBI component (NC2), suggesting the 43 GHz VLBI core as the site of energy dissipation. Another new component, NC3, is ejected after the last three flares, which suggests that the emission is produced upstream from the core (closer to the black hole). The study therefore indicates multiple sites of energy dissipation in the source. An anticorrelation is detected between the optical percentage polarization (PP) and optical/γ-ray flux variations, while the PP has a positive correlation with optical/γ-ray spectral indices. Given that the mean polarization is inversely proportional to the number of cells in the emission region, the PP versus optical/γ-ray anticorrelation could be due to more active cells during the outburst than at other times. In addition to the turbulent component, our analysis suggests the presence of a combined turbulent and ordered magnetic field, with the ordered component transverse to the jet axis.

KW - galaxies: active

KW - galaxies: jets

KW - gamma rays: galaxies

KW - quasars: individual (3C 279)

KW - radio continuum: galaxies

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