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Detection of helicoidal motion in the optical jet of PKS 0521-365
Astrophysics of Galaxies · Submitted 5 Jun 2017
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The velocity pattern derived from the $\text{[O II]}\,\lambda 3727\,\AA,\, \text{H}\beta\, \lambda 4861\,\AA\,$ and [O III] $\lambda\lambda4959,5007\,\AA\,$ emission lines is well-fitted by a sinusoidal function of the form: $v(r)=\alpha r^{1/2}sin(\beta r^{1/2}+\gamma)$, suggesting helicoidal motions along the jet up to distances of $20\,\text{kpc}$.
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The abstract, sentence by sentence
The jet activity of Active Galactic Nuclei (AGN), and its interaction with the interstellar medium (ISM), may play a pivotal role in the processes which regulate the growth and star formation of its host galaxy. Observational evidence which pinpoints the conditions of such interaction is paramount to unveil the physical processes involved. We report on the discovery of extended emission line regions exhibiting an S-shaped morphology along the optical jet of the radio-loud AGN $\text{PKS}\,0521-365$ ($z=0.055$), by using long-slit spectroscopic observations obtained with FORS2 on VLT. The velocity pattern derived from the $\text{[O II]}\,\lambda 3727\,\AA,\, \text{H}\beta\, \lambda 4861\,\AA\,$ and [O III] $\lambda\lambda4959,5007\,\AA\,$ emission lines is well-fitted by a sinusoidal function of the form: $v(r)=\alpha r^{1/2}sin(\beta r^{1/2}+\gamma)$, suggesting helicoidal motions along the jet up to distances of $20\,\text{kpc}$. We estimate a lower limit for the mass of the outflowing ionized gas along the jet of $\sim$10$^4\,M_\odot$. Helical magnetic fields and jet precession have been proposed to explain helicoidal paths along the jet at pc scales; nevertheless, it is not clear yet whether these hypotheses may hold at kpc scales.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | The jet activity of Active Galactic Nuclei (AGN), and its interaction with the interstellar medium (ISM), may play a pivotal role in the processes which regulate the growth and star formation of its host galaxy. | background 1.00 | 0.03 | 0.02 | hedged possibility 1.00 |
| s1 | Observational evidence which pinpoints the conditions of such interaction is paramount to unveil the physical processes involved. | background 0.85 | 0.04 | 0.02 | asserted 0.95 |
| s2 | We report on the discovery of extended emission line regions exhibiting an S-shaped morphology along the optical jet of the radio-loud AGN $\text{PKS}\,0521-365$ ($z=0.055$), by using long-slit spectroscopic observations obtained with FORS2 on VLT. | contribution 0.51 | 0.98 | 0.23 | asserted 1.00 |
| s3 | The velocity pattern derived from the $\text{[O II]}\,\lambda 3727\,\AA,\, \text{H}\beta\, \lambda 4861\,\AA\,$ and [O III] $\lambda\lambda4959,5007\,\AA\,$ emission lines is well-fitted by a sinusoidal function of the form: $v(r)=\alpha r^{1/2}sin(\beta r^{1/2}+\gamma)$, suggesting helicoidal motions along the jet up to distances of $20\,\text{kpc}$. | result 0.96 | 0.95 | 0.79 | hedged possibility 0.91 |
| s4 | We estimate a lower limit for the mass of the outflowing ionized gas along the jet of $\sim$10$^4\,M_\odot$. | result 1.00 | 0.96 | 0.06 | asserted 0.96 |
| s5 | Helical magnetic fields and jet precession have been proposed to explain helicoidal paths along the jet at pc scales; nevertheless, it is not clear yet whether these hypotheses may hold at kpc scales. | gap 0.86 | 0.04 | 0.05 | hedged possibility 0.64 |
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Original abstract
The jet activity of Active Galactic Nuclei (AGN), and its interaction with the interstellar medium (ISM), may play a pivotal role in the processes which regulate the growth and star formation of its host galaxy. Observational evidence which pinpoints the conditions of such interaction is paramount to unveil the physical processes involved. We report on the discovery of extended emission line regions exhibiting an S-shaped morphology along the optical jet of the radio-loud AGN $\text{PKS}\,0521-365$ ($z=0.055$), by using long-slit spectroscopic observations obtained with FORS2 on VLT. The velocity pattern derived from the $\text{[O II]}\,\lambda 3727\,\AA,\, \text{H}\beta\, \lambda 4861\,\AA\,$ and [O III] $\lambda\lambda4959,5007\,\AA\,$ emission lines is well-fitted by a sinusoidal function of the form: $v(r)=\alpha r^{1/2}sin(\beta r^{1/2}+\gamma)$, suggesting helicoidal motions along the jet up to distances of $20\,\text{kpc}$. We estimate a lower limit for the mass of the outflowing ionized gas along the jet of $\sim$10$^4\,M_\odot$. Helical magnetic fields and jet precession have been proposed to explain helicoidal paths along the jet at pc scales; nevertheless, it is not clear yet whether these hypotheses may hold at kpc scales.
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