Is very high energy emission from the BL Lac 1ES 0806+524 centrifugally driven?

2017

Int. J. Mod. Phys. D

Self Cite

In this paper we study centrifugal acceleration of particles moving along a prescribed rotating curved trajectories. We consider the physical system embedded in an isotropic photon field and study the influence of the photon drag force on the acceleration process. For this purpose we study three major configurations of the field lines: the straight line; the Archimede's spiral and the dipolar field line configuration. By analysing dynamics of particles sliding along the field lines in the equatorial plane we have found several interesting features of motion. In particular, it has been shown that for rectilinear field lines the particles reach the light cylinder (area where the linear velocity of rotation exactly equals the speed of light) zone relatively slowly for bigger drag forces. Considering the Archimede's spiral, we have found that in cases when the field lines lag behind the rotation, the particles achieve the force-free regime of dynamics regardless of the drag force. Unlike this scenario, when the spiral is oriented in an opposite direction the particles do not reach the force free regime, but tend to stable equilibrium locations. Such a behaviour has been found for straight field lines as well.

“…A series of articles has been dedicated to mechanism of magnetocentrifugal acceleration in the magnetospheres of pulsars and AGNs (Ref. [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Centrifugal acceleration in the isotropic photon field

Bakhtadze

Berezhiani

2017

Int. J. Mod. Phys. D

Self Cite

“…In general, this is not a new idea, Bogovalov & Tsinganos (1999) and Bogovalov (2001) have considered the role of magnetocentrifugal effects in astrophysical outflows and nonaxisymmetric magnetospheres. Based on a rather different approach the mechanism of centrifugal acceleration was applied to explain the observed high and very high energy emission pattern (Osmanov et al 2007;Osmanov 2010) in some astrophysical settings.…”

Section: Introductionmentioning

confidence: 99%

Extremely efficient Zevatron in rotating AGN magnetospheres

Monthly Notices of the Royal Astronomical Society

Mahajan

Machabeli

et al. 2014

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A novel model of particle acceleration in the magnetospheres of rotating active galactic nuclei (AGN) is constructed.The particle energies may be boosted up to 10 21 eV in a two step mechanism: In the first stage, the Langmuir waves are centrifugally excited and amplified by means of a parametric process that efficiently pumps rotational energy to excite electrostatic fields. In the second stage, the electrostatic energy is transferred to particle kinetic energy via Landau damping made possible by rapid "Langmuir collapse". The time-scale for parametric pumping of Langmuir waves turns out to be small compared to the kinematic time-scale, indicating high efficiency of the first process. The second process of "Langmuir collapse" -the creation of caverns or low density regions -also happens rapidly for the characteristic parameters of the AGN magnetosphere. The Langmuir collapse creates appropriate conditions for transferring electric energy to boost up already high particle energies to much higher values. It is further shown that various energy loss mechanism are relatively weak, and do not impose any significant constraints on maximum achievable energies.

“…The similar problem was studied for Active Galactic Nuclei (AGN) in Ref. 8,9,10 where it was found that the co-rotation of plasma particles leads to extremely high energy of relativistic electrons, which, in turn, provides TeV energies for soft photons via the inverse Compton scattering.…”

Section: Introductionmentioning

confidence: 93%

On the role of rotation in the outflows of the Crab pulsar

Irakli

Andria

2015

Int. J. Mod. Phys. D

In order to study constraints imposed on kinematics of the Crab pulsar's jet we consider motion of particles along co-rotating field lines in the magnetosphere of the Crab pulsar. It is shown that particles following the co-rotating magnetic field lines may attain velocities close to observable values. In particular, we demonstrate that if the magnetic field lines are within the light cylinder, the maximum value of the velocity component parallel to the rotation axis is limited by 0.5c. This result in the context of the X-ray observations performed by Chandra X-ray Observatory seems to be quite indicative and useful to estimate the density of field lines inside the jet. Considering the three-dimensional (3D) field lines crossing the light cylinder, we found that for explaining the force-free regime of outflows the magnetic field lines must asymptotically tend to the Archimedes' spiral configuration. It is also shown that the 3D case may explain the observed jet velocity for appropriately chosen parameters of magnetic field lines.