Exploring the non-linear motion of the parsec-scale jet of FSRQ 1633+382

Hyunwook Ro, Bong Won Sohn, Aeree Chung, Thomas P. Krichbaum

Research output: Contribution to journalConference article

Abstract

Helical magnetic field threading the accretion disk and the black hole likely play a key role in jet launching mechanisms in active galactic nuclei (AGNs). The flat-spectrum radio quasar (FSRQ) 1633+382 is a radio-loud AGN with well-developed jets which have been monitored with very long baseline interferometry (VLBI) over the last few decades, making an excellent target to probe the structure of magnetic fields in the parsec (pc)-scale quasar jets. From its VLBI observations over two decades, we find evidence for quasi-periodic and oscillating patterns in the positions of some jet components and their luminosities. The patterns are well explained when the jet components are assumed to be moving along helical trajectories, changing the Doppler factor and the apparent speed as the viewing angle of the jet changes. Our analysis supports the presence of a helically ordered magnetic field along the jet, which is predicted by jet theories and also suggested by previous observations.

Original languageEnglish
JournalProceedings of Science
Volume344
Publication statusPublished - 2018 Jan 1
Event14th European VLBI Network Symposium and Users Meeting, EVN 2018 - Granada, Spain
Duration: 2018 Oct 82018 Oct 11

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radio spectra
quasars
active galactic nuclei
interferometry
magnetic fields
launching
accretion disks
luminosity
trajectories
probes

All Science Journal Classification (ASJC) codes

  • General

Cite this

Ro, Hyunwook ; Sohn, Bong Won ; Chung, Aeree ; Krichbaum, Thomas P. / Exploring the non-linear motion of the parsec-scale jet of FSRQ 1633+382. In: Proceedings of Science. 2018 ; Vol. 344.
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Exploring the non-linear motion of the parsec-scale jet of FSRQ 1633+382. / Ro, Hyunwook; Sohn, Bong Won; Chung, Aeree; Krichbaum, Thomas P.

In: Proceedings of Science, Vol. 344, 01.01.2018.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Exploring the non-linear motion of the parsec-scale jet of FSRQ 1633+382

AU - Ro, Hyunwook

AU - Sohn, Bong Won

AU - Chung, Aeree

AU - Krichbaum, Thomas P.

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N2 - Helical magnetic field threading the accretion disk and the black hole likely play a key role in jet launching mechanisms in active galactic nuclei (AGNs). The flat-spectrum radio quasar (FSRQ) 1633+382 is a radio-loud AGN with well-developed jets which have been monitored with very long baseline interferometry (VLBI) over the last few decades, making an excellent target to probe the structure of magnetic fields in the parsec (pc)-scale quasar jets. From its VLBI observations over two decades, we find evidence for quasi-periodic and oscillating patterns in the positions of some jet components and their luminosities. The patterns are well explained when the jet components are assumed to be moving along helical trajectories, changing the Doppler factor and the apparent speed as the viewing angle of the jet changes. Our analysis supports the presence of a helically ordered magnetic field along the jet, which is predicted by jet theories and also suggested by previous observations.

AB - Helical magnetic field threading the accretion disk and the black hole likely play a key role in jet launching mechanisms in active galactic nuclei (AGNs). The flat-spectrum radio quasar (FSRQ) 1633+382 is a radio-loud AGN with well-developed jets which have been monitored with very long baseline interferometry (VLBI) over the last few decades, making an excellent target to probe the structure of magnetic fields in the parsec (pc)-scale quasar jets. From its VLBI observations over two decades, we find evidence for quasi-periodic and oscillating patterns in the positions of some jet components and their luminosities. The patterns are well explained when the jet components are assumed to be moving along helical trajectories, changing the Doppler factor and the apparent speed as the viewing angle of the jet changes. Our analysis supports the presence of a helically ordered magnetic field along the jet, which is predicted by jet theories and also suggested by previous observations.

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