On Optical Synchrotron Emission of Radio Pulsars

Малов, И. Ф.; Machabeli, G. Z.

doi:10.1086/321365

Cited by 34 publications

(29 citation statements)

References 13 publications

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“…Models for the optical emission from the Crab pulsar based on the synchrotron mechanism often aim at reproducing the maximum frequency in the optical range (ν m ∼ 5 × 10 14 Hz, eg., Stoneham 1981;Mavlov & Machabeli 2001;Lyne & Graham-Smith 1998). This is mainly based on the observations by Oke (1969), and is not supported by the more recent observations presented in Sollerman et al (2000).…”

Section: The Pulsarmentioning

confidence: 74%

The Crab pulsar and its red knot in the near-infrared

Sollerman

2003

A&A

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Abstract. We present near-infrared observations obtained with ISAAC on the VLT of the Crab pulsar and its environment. Photometry of the pulsar in J s , H and K s shows the pulsar spectrum to extend fairly smoothly from the UV/optical regime. PSF subtraction of the pulsar allows us to study its immediate neighborhood in some detail. In particular, the knot positioned just 0. 6 from the pulsar has been revealed in the IR. Using also archival HST data for the knot, we have measured its broad band spectrum to rise steeply into the IR, in contrast to the spectrum of the pulsar itself.

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Section: The Pulsarmentioning

confidence: 74%

The Crab pulsar and its red knot in the near-infrared

Sollerman

2003

A&A

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“…Non-thermal models for the optical radiation of slower pulsars like the Crab ascribe it to synchrotron emission (see Pacini 1971 andPacini &Salvati 1987) by relativistic particles near the light cylinder radius at very small pitch angles (Ψ 1/γ, where the Lorentz factor may be γ ∼ 10 2 −10 3 ; Crusius-Wätzel et al 2001). Malov & Machabeli (2001) show that finite pitch angles of the plasma particles appear in the outer magnetosphere near the light cylinder due to an instability associated with the cyclotron resonance condition being fulfilled there. They further show that pulsars with shorter periods such as the MSPs attain harder spectra and higher peak frequencies.…”

Section: Discussionmentioning

confidence: 91%

Deep optical observations of the fields of two nearby millisecond pulsars with the VLT

Sutaria

Ray

Reisenegger

et al. 2003

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Abstract. We report on deep VLT observations of the fields of two nearby, isolated millisecond pulsars, PSR J1744-1134 and PSR J1024-0719. Both objects are old neutron stars with characteristic age τ ≥ 10 9 yr and have relatively high spin-down flux. They have been detected earlier as X-ray sources by ROSAT HRI observations and were considered good candidates for non-thermal emission in the optical bands. Our observations set an upper limit of B = 26.9, V = 26.3 and R = 26.0 for PSR J1744-1134. In the case of PSR J1024-0719, we find two faint objects near the radio position of the pulsar. Using multiband photometry from the VLT and spectroscopy carried out with the Magellan I telescope, we discuss the nature of the brighter object and the possibility of the fainter one being the optical counterpart of PSR J1024-0719. We consider the implications of our findings for both pulsars in the context of theoretical models of high-energy emission from old pulsars.

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“…As we already mentioned in the introduction, the timescale is very short for the transit to the ground Landau state that provides quasi-one-dimensional motion of electrons along the field lines without radiation. As investigated in a series of papers (Machabeli & Usov 1979;Malov & Machabeli 2001), the cyclotron instability of the electron-positron plasma under certain conditions, may however "create" pitch angles, which activate the subsequent synchrotron process. We consider the plasma to consist of two components: (a) the electron-positron plasma component with the Lorentz factor, γ p and (b) highly relativistic electrons, the so-called beam component with the Lorentz factor, γ b (γ b γ p ).…”

Section: Main Considerationmentioning

confidence: 99%

Quasi-linear diffusion driving the synchrotron emission in active galactic nuclei

Osmanov

Machabeli

2010

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Aims. We study the role of the quasi-linear diffusion (QLD) in producing X-ray emission by means of ultra-relativistic electrons in AGN magnetospheric flows. Methods. We examined two regions: (a) an area close to the black hole and (b) the outer magnetosphere. The synchrotron emission has been studied for ultra-relativistic electrons and was shown that the QLD generates the soft and hard X-rays, close to the black hole and on the light cylinder scales respectively. Results. By considering the cyclotron instability, we show that despite the short synchrotron cooling timescales, the cyclotron modes excite transverse and longitudinal-transversal waves. On the other hand, it is demonstrated that the synchrotron reaction force and a force responsible for the conservation of the adiabatic invariant tend to decrease the pitch angles, whereas the diffusion, that pushes back on electrons by means of the aforementioned waves, tends to increase the pitch angles. By examining the quasi-stationary state, we investigate a regime in which these two processes are balanced and a non-vanishing value of pitch angles is created. Conclusions.

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On Optical Synchrotron Emission of Radio Pulsars

Cited by 34 publications

References 13 publications

The Crab pulsar and its red knot in the near-infrared

The Crab pulsar and its red knot in the near-infrared

Deep optical observations of the fields of two nearby millisecond pulsars with the VLT

Quasi-linear diffusion driving the synchrotron emission in active galactic nuclei

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