Mojave: Monitoring of Jets in Active Galactic Nuclei With Vlba Experiments. V. Multi-Epoch Vlba Images

Lister, M. L.; Aller, H. D.; Aller, M. F.; Cohen, M. H.; Homan, D. C.; Kadler, M.; Kellermann, K. I.; Kovalev, Y. Y.; Ros, E.; Savolainen, Tuomas; Zensus, J. A.; Vermeulen, R. C.

doi:10.1088/0004-6256/137/3/3718

Cited by 344 publications

(141 citation statements)

References 120 publications

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“…This research has made use of NASAs Astrophysics Data System and used data from the MOJAVE database that is maintained by the MOJAVE team [16]. The authors acknowledge the efforts of the many people who made the study of such a vast dataset possible.…”

Section: Acknowledgmentsmentioning

confidence: 99%

The long-term evolution of the parsec scale jet of the quasar 3C345

Schinzel

Lobanov

Zensus

2012

J. Phys.: Conf. Ser.

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Abstract. The quasar 3C 345 is one of the best examples of an active galactic nucleus (AGN) showing structural and flux variability on parsec scales around a compact unresolved radio core. Over the past 30 years, it has been followed up closely from radio to gamma-ray wavebands with a special focus on very long baseline interferometry (VLBI) observations in the range of 1-100 GHz. The complex parsec-scale jet of 3C 345 exemplifies an archetypical 'superluminal' jet with an apparent helical morphology. Here we present first results from a study of the long-term jet evolution, especially focusing on the evolution of trajectories, kinematics, and emission in more than 20 enhanced emission regions embedded in the jet. A "closeup" on physical properties of individual features implies that the outer jet is most likely dominated by Kelvin-Helmholtz instability. Studies of general trends in properties of those features provide certain evidence for their apparent trajectories to result from an underlying (slowly evolving) pattern lit up by passages of plasma condensations ejected during the nuclear flares. The long-term evolution of this pattern indicates its possible relation either to the elliptical mode of Kelvin-Helmholtz instability or precession of the jet direction.

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Section: Acknowledgmentsmentioning

confidence: 99%

The long-term evolution of the parsec scale jet of the quasar 3C345

Schinzel

Lobanov

Zensus

2012

J. Phys.: Conf. Ser.

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“…The MOJAVE program (http://www.physics.purdue.edu/astro/MOJAVE/index.html) [31] monitors the parsec scale structure and evolution of more than 300 AGN jets at 15 GHz with the Very Long Baseline Array (VLBA) in total intensity, linear, and circular polarization. First epoch observations of circular polarization from our original 133 source sample were published in [18], and we found strong circular polarization, ≥0.3%, in approximately 15% of our sample.…”

Section: Circular Polarization From Mojavementioning

confidence: 99%

Constraints on Particles and Fields from Full Stokes Observations of AGN

et al. 2018

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Combined polarization imaging of radio jets from Active Galactic Nuclei (AGN) in circular and linear polarization, also known as full Stokes imaging, has the potential to constrain both the magnetic field structure and particle properties of jets. Although only a small fraction of the emission when detected, typically less than a few tenths of a percent but up to as much as a couple of percent in the strongest resolved sources, circular polarization directly probes the magnetic field and particles within the jet itself and is not expected to be modified by external screens. A key to using full Stokes observations to constrain jet properties is obtaining a better understanding of the emission of circular polarization, including its variability and spectrum. We discuss what we have learned so far from parsec scale monitoring observations in the MOJAVE program and from multi-frequency observations of selected AGN.

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“…We use the following samples: we take the brightness temperature measured by Kovalev et al (2005) and the core shifts by Pushkarev et al (2012). The apparent velocity β app we take from Lister et al (2009). We also use the black hole masses M BH and the accretion luminosities L acc collected by Zamaninasab et al (2014).…”

Section: The Jet Power and The Rotation Ratementioning

confidence: 99%

The Correlation between the Total Magnetic Flux and the Total Jet Power

Nokhrina

2017

Front. Astron. Space Sci.

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Magnetic field threading a black hole ergosphere is believed to play the key role in both driving the powerful relativistic jets observed in active galactic nuclei and extracting the rotational energy from a black hole via Blandford-Znajek process. The magnitude of magnetic field and the magnetic flux in the vicinity of a central black hole is predicted by theoretical models. On the other hand, the magnetic field in a jet can be estimated through measurements of either the core shift effect or the brightness temperature. In both cases the obtained magnetic field is in the radiating domain, so its direct application to the calculation of the magnetic flux needs some theoretical assumptions. In this paper we address the issue of estimating the magnetic flux contained in a jet using the measurements of a core shift effect and of a brightness temperature for the jets, directed almost at the observer. The accurate account for the jet transversal structure allow us to express the magnetic flux through the observed values and an unknown rotation rate of magnetic surfaces. If we assume the sources are in a magnetically arrested disk state, the lower limit for the rotation rate can be obtained. On the other hand, the flux estimate may be tested against the total jet power predicted by the electromagnetic energy extraction model. The resultant expression for power depends logarithmically weakly on an unknown rotation rate. We show that the total jet power estimated through the magnetic flux is in good agreement with the observed power. We also obtain the extremely slow rotation rates, which may be an indication that the majority of the sources considered are not in the magnetically arrested disk state.

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Mojave: Monitoring of Jets in Active Galactic Nuclei With Vlba Experiments. V. Multi-Epoch Vlba Images

Cited by 344 publications

References 120 publications

The long-term evolution of the parsec scale jet of the quasar 3C345

The long-term evolution of the parsec scale jet of the quasar 3C345

Constraints on Particles and Fields from Full Stokes Observations of AGN

The Correlation between the Total Magnetic Flux and the Total Jet Power

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