scholarly journals Relativistic Effects of Rotation in γ-ray Pulsars—Invited Review

Galaxies ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 6
Author(s):  
Zaza Osmanov
Keyword(s):  
Relativistic Effects ◽  
Limiting Factors ◽  
Acceleration Of Particles ◽  
Centrifugal Acceleration ◽  
Langmuir Waves ◽  
Inverse Compton Scattering ◽  
Curvature Radiation ◽  
Inverse Compton ◽  
Γ Ray ◽  
Effects Of Rotation

In this paper, we consider the relativistic effects of rotation in the magnetospheres of γ-ray pulsars. The paper reviews the progress achieved in this field during the last three decades. For this purpose, we examine the direct centrifugal acceleration of particles and the corresponding limiting factors: the constraints due to the curvature radiation and the inverse Compton scattering of electrons against soft photons. Based on the obtained results, the generation of parametrically excited Langmuir waves and the corresponding Landau–Langmuir centrifugal drive are studied.

scholarly journals Detection of the Geminga pulsar with MAGIC hints at a power-law tail emission beyond 15 GeV

2020 ◽  
Vol 643 ◽  
pp. L14
Author(s):  
◽  
V. A. Acciari ◽  
S. Ansoldi ◽  
L. A. Antonelli ◽  
A. Arbet Engels ◽  
...  
Keyword(s):  
Energy Range ◽  
Power Law ◽  
Gamma Ray ◽  
Low Energy ◽  
Significance Level ◽  
Inverse Compton Scattering ◽  
Curvature Radiation ◽  
Sensitivity Range ◽  
Inverse Compton ◽  
First Time

We report the detection of pulsed gamma-ray emission from the Geminga pulsar (PSR J0633+1746) between 15 GeV and 75 GeV. This is the first time a middle-aged pulsar has been detected up to these energies. Observations were carried out with the MAGIC telescopes between 2017 and 2019 using the low-energy threshold Sum-Trigger-II system. After quality selection cuts, ∼80 h of observational data were used for this analysis. To compare with the emission at lower energies below the sensitivity range of MAGIC, 11 years of Fermi-LAT data above 100 MeV were also analysed. From the two pulses per rotation seen by Fermi-LAT, only the second one, P2, is detected in the MAGIC energy range, with a significance of 6.3σ. The spectrum measured by MAGIC is well-represented by a simple power law of spectral index Γ = 5.62 ± 0.54, which smoothly extends the Fermi-LAT spectrum. A joint fit to MAGIC and Fermi-LAT data rules out the existence of a sub-exponential cut-off in the combined energy range at the 3.6σ significance level. The power-law tail emission detected by MAGIC is interpreted as the transition from curvature radiation to Inverse Compton Scattering of particles accelerated in the northern outer gap.

scholarly journals Very High Energy γ-Ray Generation Near The Light Cylinder of an Axisymmetric Rotator: Cos-B Like γ-Ray Sources

1992 ◽  
Vol 128 ◽  
pp. 207-208
Author(s):  
S. V. Bogovalov ◽  
YU. D. Kotov
Keyword(s):  
High Energy ◽  
Relativistic Electrons ◽  
X Rays ◽  
Inverse Compton Scattering ◽  
Light Cylinder ◽  
Radiation Spectra ◽  
Inverse Compton ◽  
Very High Energy ◽  
Γ Ray ◽  
Very High

AbstractSuper-hard γ-ray radiation spectra have been calculated. This radiation is generated near the velocity-of-light cylinder through the process of inverse-Compton scattering of relativistic electrons by thermal photons radiated by a neutron star. These calculations have been compared with observations of the Crab and Vela pulsars at 1000-GeV γ-ray energies. A correlation between γ-ray flares and those in soft (Ex ≃ lkeV) X-rays are predicted.

scholarly journals An Explanation for Pulsar Mode Changing Phenomenon

1996 ◽  
Vol 160 ◽  
pp. 225-226
Author(s):  
B. Zhang ◽  
G.J. Qiao ◽  
W.P. Lin ◽  
J.L. Han
Keyword(s):  
Resonant Frequency ◽  
Compton Scattering ◽  
High Energy ◽  
Switching Effect ◽  
Inverse Compton Scattering ◽  
Thermal Peak ◽  
Curvature Radiation ◽  
Inverse Compton ◽  
High Energy Particles

AbstractThere are three mechanisms to cause pulsar inner gap breakdown: the inverse Compton scattering (ICS) of the high energy particles off the thermal-peak photons, off the resonant-frequency photons and the curvature radiation (CR). The pulsar mode-changing phenomenon can be interpreted as a switching effect between theresonant ICS sparking modeand thethermal ICS sparking mode.

scholarly journals Particle Acceleration in Extragalactic Jets and Implications for the High-Energy Emission from Blazars

1994 ◽  
Vol 159 ◽  
pp. 29-32
Author(s):  
R. Schlickeiser ◽  
C. D. Dermer
Keyword(s):  
Compton Scattering ◽  
Accretion Disk ◽  
High Energy ◽  
Relativistic Electrons ◽  
Spectral Evolution ◽  
Inverse Compton Scattering ◽  
Central Engine ◽  
Inverse Compton ◽  
Γ Rays ◽  
Γ Ray

We demonstrate that the prevalence of superluminal sources in the sample of γ-ray blazars and the peak of their luminosity spectra at γ-ray energies can be readily explained if the γ-rays result from the inverse Compton scattering of the accretion disk radiation by relativistic electrons in outflowing plasam jets. Compton scattering of external radiation by nonthermal particles in blazar jets is dominated by accretion disk photons rather than scattered radiation to distances of ∼ 0.01–0.1 pc from the central engine for standard parameters. The size of the γ-ray photosphere and the spectral evolution of the relativistic electron spectra constrain the location of the acceleration and emission sites in these objects.

scholarly journals Inverse Compton Scattering of Starlight in the Kiloparsec-scale Jet in Centaurus A: The Origin of Excess TeV γ-Ray Emission

2019 ◽  
Vol 878 (2) ◽  
pp. 139 ◽  
Author(s):  
K. Tanada ◽  
J. Kataoka ◽  
Y. Inoue
Keyword(s):  
Compton Scattering ◽  
Inverse Compton Scattering ◽  
Inverse Compton ◽  
Γ Ray ◽  
Centaurus A

scholarly journals A Joint Model for Radio and γ-ray Emission from Pulsars

2003 ◽  
Vol 214 ◽  
pp. 167-170 ◽  
Author(s):  
G. J. Qiao ◽  
K. J. Lee ◽  
H. G. Wang ◽  
R. X. Xu
Keyword(s):  
Electromagnetic Wave ◽  
Compton Scattering ◽  
Gamma Ray ◽  
Joint Model ◽  
Acceleration Process ◽  
Inverse Compton Scattering ◽  
Band Emission ◽  
Null Surface ◽  
Inverse Compton ◽  
Γ Ray

Although pulsars can radiate electromagnetic wave from radio to gamma ray bands, we still have no a united model to understand the multi-band emission. In this paper the effort for a joint model is presented. The inverse Compton scattering (ICS) and a second acceleration process near the null surface are involved to account for the radio and the gama-ray emission, respectively. Various kind of pulse profiles and other observational properties can be reproduced.

Can Galactic γ-Ray Background be due to Superposition of γ-Rays from Millisecond Pulsars?

1998 ◽  
Vol 188 ◽  
pp. 273-274
Author(s):  
V.B. Bhatia ◽  
S. Mishra ◽  
N. Panchapakesan
Keyword(s):  
Cosmic Rays ◽  
Cosmic Ray ◽  
Diffuse Radiation ◽  
High Energy ◽  
Molecular Gas ◽  
Inverse Compton Scattering ◽  
High Energy Electrons ◽  
Inverse Compton ◽  
Γ Rays ◽  
Γ Ray

The SAS 2 and COS B observations have established the existence of diffuse γ-rays in our Galaxy in various energy ranges. The diffuse radiation is attributed to the interaction of cosmic ray nuclei and electrons with the particles of interstellar atomic and molecular gas (via the decay of pions and bremsstrahlung, respectively). Inverse Compton scattering of interstellar photons by the high energy electrons of cosmic rays may also be contributing to this background. In addition some contribution may come from discrete sources of γ-rays.

NUCLEAR PHOTON SCIENCE WITH INVERSE-COMPTON SCATTERING

2009 ◽  
Vol 18 (10) ◽  
pp. 1970-1975
Author(s):  
MAMORU FUJIWARA
Keyword(s):  
Materials Science ◽  
Nuclear Reactions ◽  
Short Pulse ◽  
Medical Science ◽  
High Energy ◽  
Hadron Structure ◽  
Inverse Compton Scattering ◽  
Inverse Compton ◽  
Γ Ray ◽  
New Research

Recent developments of the synchroton radiation facilities and intense lasers are now guiding us to a new research frontier with probes of a high energy GeV photon beam and an intense and short pulse MeV γ-ray beam. New directions of the science developments with photo-nuclear reactions are discussed. The inverse Compton γ -ray has two good advantages for searching for a microscopic quantum world; they are 1) good emmitance and 2) high linear and circular polarizations. With these advantages, photon beams in the energy range from MeV to GeV are used for studying hadron structure, nuclear structure, astrophysics, materials science, as well as for applying medical science.

scholarly journals On the Broad Band Energy Distribution of Blazars

1994 ◽  
Vol 159 ◽  
pp. 221-232
Author(s):  
Laura Maraschi ◽  
Gabriele Ghisellini ◽  
Annalisa Celotti
Keyword(s):  
Spectral Component ◽  
Broad Band ◽  
Relativistic Electrons ◽  
Band Energy ◽  
X Ray ◽  
Inverse Compton Scattering ◽  
Inverse Compton ◽  
Γ Rays ◽  
Γ Ray ◽  
Main Components

The broad band energy distributions of blazars are revisited with particular emphasis on the sources detected in γ-rays by the Compton Observatory (GRO). The observed distributions can be broken down into two main components, corresponding to two broad peaks in the vFv representation. The first occurs in the FIR-optical range, the second in the MeV-GeV region. In the case of MKN 421, which may be representative of X-ray selected BL Lacs, the first peak is shifted to higher frequency (≃ 1016 Hz) and the γ-ray spectrum extends to TeV energies. There is general agreement that the first spectral component is due to synchrotron radiation from a relativistic jet, although some problems remain in deriving the spectrum and location of the emitting relativistic electrons. The second component, which in most objects extends from the X-ray to the γ-ray range, can be naturally interpreted as inverse Compton scattering by the same electrons producing the synchrotron photons, either on the synchrotron photons themselves (SSC) or on photons external to the jet. It is argued that multifrequency studies of these sources including γ-rays will allow to test Inverse Compton models and to distinguish between different sources of photons.

Does the Prompt γ‐Ray Emission of Gamma‐Ray Bursts Arise from Resonant Inverse Compton Scattering?

2008 ◽  
Vol 680 (1) ◽  
pp. 539-544 ◽  
Author(s):  
L. Chen ◽  
D. B. Liu ◽  
Y. F. Huang ◽  
J. H. You
Keyword(s):  
Compton Scattering ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Inverse Compton Scattering ◽  
Inverse Compton ◽  
Γ Ray
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