Current generation in extragalactic jets by Cherenkov damping of magnetohydrodynamic waves

Jafelice, L. C.; Opher, R.; Assis, A. S. de; Busnardo‐Neto, J.

doi:10.1086/168214

Cited by 12 publications

(5 citation statements)

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Section: Challenge (6): Can Modified Gravity Explain Dark Energy?mentioning

confidence: 99%

“…Detailed physics, however, of the accretion disk, in particular, its instabilities and nonlinear interactions and its connection with the jet and compact object, needs to be made. Relativistic jets could be hydrodynamically collimated (26) or magnetohydrodynamically collimated (27). Little work has been done on magnetohydrodynamic collimation since our 1990 study (27).…”

Section: Challenge (6): Can Modified Gravity Explain Dark Energy?mentioning

confidence: 99%

“…Relativistic jets could be hydrodynamically collimated (26) or magnetohydrodynamically collimated (27). Little work has been done on magnetohydrodynamic collimation since our 1990 study (27). CHALLENGE (8): What is the origin of the ubiquitous microgauss magnetic fields in high and low redshift galaxies?…”

Section: Challenge (6): Can Modified Gravity Explain Dark Energy?mentioning

confidence: 99%

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News and Views: Challenges of Relativistic Astrophysics

Opher

2013

Braz J Phys

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I discuss some of the most outstanding challenges in relativistic astrophysics in the subjects of: COMPACT OBJECTS (Black Holes and Neutron Stars); DARK SECTOR (Dark Matter and Dark Energy); PLASMA ASTROPHYSICS (Origin of Jets, Cosmic Rays and Magnetic Fields) and the PRIMORDIAL UNIVERSE (Physics at the beginning of the Universe). In these four subjects, I discuss twelve of the most important challenges. These challenges give us insight into new physics that can only be studied in the large scale Universe. The near future possibilities, in observations and theory, for addressing these challenges, are also discussed.

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Section: Challenge (6): Can Modified Gravity Explain Dark Energy?mentioning

confidence: 99%

Section: Challenge (6): Can Modified Gravity Explain Dark Energy?mentioning

confidence: 99%

Section: Challenge (6): Can Modified Gravity Explain Dark Energy?mentioning

confidence: 99%

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News and Views: Challenges of Relativistic Astrophysics

Opher

2013

Braz J Phys

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“…The jet-like structure is highly collimated and includes filament structure, as well. A mechanism (MHD wave pumping) that produces an axial current which collimates the jets, has been suggested by Jafelice et al (1990). Gouveia Dal Pino and Opher ( , 1993 suggested that the filaments may be produced by a thermal instability.…”

Section: Relativistic Jetsmentioning

confidence: 99%

Introduction to plasma astrophysics

Opher¹

1999

Plasma Phys. Control. Fusion

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We discuss the importance of plasma physics in various areas of cosmology and astrophysics: (1) the primordial plasma spectrum, (2) the cosmic microwave background, (3) the large-scale structure of the universe, (4) reionization and the metalicity of the primordial universe, (5) the first objects, (6) the primordial magnetic field, (7) clusters of galaxies, (8) galaxy formation, (9) star formation, (10) nuclear reactions, (11) accretion onto black holes, (12) cosmic rays, (13) relativistic jets and ( 14) gamma ray bursters.

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“…We assume regular previous active (i.e., jet-current generation) periods, T act ^ f Ti nact (Ti nact Ξ inactive period), and that T act ^ Tj , the present jet age (taken as ^ 6x10" years). Jet current generation has recently been discussed by Jafelice et al (1989). We studied f= 1; 10"^; and 10 .…”

Section: Applicationsmentioning

confidence: 99%

The Role of Extragalactic Jets in the Magnetization of the Intergalactic Medium

Jafelice

Opher²

1990

Symp. - Int. Astron. Union

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We consider a current carrying extragalactic jet and the corresponding return current closing the circuit. The Lorentz force for the return path is expansive. Assuming that the expansion occurs at the local Alfvén velocity, we calculate numerically the radial distance from the jet axis which the return circuit reaches due to this electrodynamic expansion. The calculations are made explicity for parameter values observed for the sources Cygnus A, NGC 6251, 3C465 and M84. The results obtained can explain several magnetic features observed in these sources. The possible importance of previous generations of extragalactic jets in the large scale magnetization of the intergalactic medium is also discussed.

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Current generation in extragalactic jets by Cherenkov damping of magnetohydrodynamic waves

Cited by 12 publications

References 0 publications

News and Views: Challenges of Relativistic Astrophysics

News and Views: Challenges of Relativistic Astrophysics

Introduction to plasma astrophysics

The Role of Extragalactic Jets in the Magnetization of the Intergalactic Medium

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