Radio Jets and UHE Gamma-ray Emission in Cyg X-3

1993 ◽  
Vol 10 (3) ◽  
pp. 208-210 ◽  
Author(s):  
R.K. Manchanda ◽  
L.E. Waldron ◽  
R.K. Sood
Keyword(s):  
Radiative Decay ◽  
Gamma Ray ◽  
High Energy ◽  
Ultra High Energy ◽  
Radio Jets ◽  
Relativistic Jet ◽  
Low Mass ◽  
Time Variations ◽  
Ambient Particle ◽  
Gamma Ray Emission

AbstractThe low-mass X-ray binary source Cyg X–3 has been extensively observed from radio to ultra-high-energy (UHE) gamma-ray energies (i.e., energies >1015eV). In the radio, Cyg X–3 exhibits intense non-thermal outbursts (flares) and a double-sided relativistic jet morphology. Interestingly, at energies above 1 TeV (1012eV), the gamma-ray emission is highly variable and possibly correlated with the radio outbursts. This emission results primarily from the radiative decay of π°-mesons generated in inelastic collisions between relativistic nuclei (predominantly protons) and the surrounding matter. The observed flux of UHE gamma-rays from Cyg X–3 implies that Cyg X–3 is a localised accelerator of such particles.We propose a model of Cyg X–3 wherein particles expelled by the source are accelerated by Shockwaves in the relativistically expanding jets. Intense flaring episodes then lead to time variations in the ambient particle flux which account for the observed features at UHE energies.

scholarly journals Radio jets and gamma-ray emission in radio-silent narrow-line Seyfert 1 galaxies

2018 ◽  
Vol 614 ◽  
pp. L1 ◽  
Author(s):  
A. Lähteenmäki ◽  
E. Järvelä ◽  
V. Ramakrishnan ◽  
M. Tornikoski ◽  
J. Tammi ◽  
...  
Keyword(s):  
Gamma Rays ◽  
Supernova Remnants ◽  
Gamma Ray ◽  
Spiral Galaxies ◽  
Narrow Line ◽  
Radio Jets ◽  
Relativistic Jet ◽  
Gamma Ray Emission

We have detected six narrow-line Seyfert 1 (NLS1) galaxies at 37 GHz that were previously classified as radio silent and two that were classified as radio quiet. These detections reveal the presumption that NLS1 galaxies labelled radio quiet or radio silent and hosted by spiral galaxies are unable to launch jets to be incorrect. The detections are a plausible indicator of the presence of a powerful, most likely relativistic jet because this intensity of emission at 37 GHz cannot be explained by, for example, radiation from supernova remnants. Additionally, one of the detected NLS1 galaxies is a newly discovered source of gamma rays and three others are candidates for future detections.

scholarly journals High Energy Phenomena in AGN Jets

1998 ◽  
Vol 188 ◽  
pp. 153-156
Author(s):  
F. Takahara
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Line Of Sight ◽  
Time Variability ◽  
Optical Polarization ◽  
Bl Lac Objects ◽  
Relativistic Jet ◽  
Bl Lac ◽  
Gamma Ray Emission ◽  
Superluminal Expansion

BL-Lac objects and optically violent variable quasars (OVVs), called together blazars, are characterized by rapid time variability, strong optical polarization, superluminal expansion and strong gamma-ray emission. Such properties are understood in the framework of a relativistic jet emanated from the central powerhouse. Blazars are considered to be objects for which the direction of the jet is very close to the line of sight.

Survey of ultra-high-energy gamma-ray emission in the Magellanic Clouds

1993 ◽  
Vol 403 ◽  
pp. 239 ◽  
Author(s):  
W. H. Allen ◽  
I. A. Bond ◽  
E. Budding ◽  
M. J. Conway ◽  
A. Daniel ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Magellanic Clouds ◽  
Ultra High Energy ◽  
High Energy Gamma ◽  
Energy Gamma ◽  
Gamma Ray Emission

A Search for Ultra–High‐Energy Gamma‐Ray Emission from the Crab Nebula and Pulsar

1997 ◽  
Vol 481 (1) ◽  
pp. 313-326 ◽  
Author(s):  
A. Borione ◽  
M. A. Catanese ◽  
M. C. Chantell ◽  
C. E. Covault ◽  
J. W. Cronin ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Crab Nebula ◽  
High Energy ◽  
Ultra High Energy ◽  
High Energy Gamma ◽  
Energy Gamma ◽  
Gamma Ray Emission ◽  
The Crab Nebula

scholarly journals Origin of Ultra-High Energy Cosmic Rays: Nuclear Composition of Gamma-Ray Burst Jets

2011 ◽  
Vol 7 (S279) ◽  
pp. 389-390
Author(s):  
Sanshiro Shibata ◽  
Nozomu Tominaga
Keyword(s):  
Cosmic Rays ◽  
Gamma Ray ◽  
High Energy ◽  
Ultra High Energy ◽  
Heavy Nuclei ◽  
Gamma Ray Burst ◽  
High Energy Cosmic Rays ◽  
Relativistic Jet ◽  
Launch Site ◽  
Nuclear Composition

AbstractUltra-high energy cosmic rays (UHECRs) are the most energetic particles flying from space and their source is not clarified yet. Recently, the Pierre Auger Observatory (PAO) suggests that UHECRs involve heavy nuclei. The PAO results require that a considerable fraction of metal nuclei must exist in the accelerating site, which can be realized only in the stellar interior. This puts strong constraints on the origin of UHECRs. In order to definitize the constraints from PAO results, we investigate the fraction of metal nuclei in a relativistic jet in gamma-ray burst associated with core-collapse supernova. If the jet is initially dominated by radiation field, quasi-statistical equilibrium (QSE) is established and heavy nuclei are dissociated to light particles such as 4He during the acceleration and expansion. On the other hand, if the jet is mainly accelerated by magnetic field heavy or intermediate mass nuclei can survive. The criterion to contain the metal nuclei is that the temperature at the launch site is below 4.5 × 109K. Therefore, if the composition of UHECRs is dominated by metal nuclei, a GRB with the magnetized jet is the most plausible candidate of the accelerating site.

A Search for Ultra–High-Energy Gamma-Ray Emission from Five Supernova Remnants

1995 ◽  
Vol 448 (1) ◽  
Author(s):  
G. E. Allen, ◽  
D. Berley, ◽  
S. Biller, ◽  
R. L. Burman, ◽  
M. Cavalli-Sforza, ◽  
...  
Keyword(s):  
Supernova Remnants ◽  
Gamma Ray ◽  
High Energy ◽  
Ultra High Energy ◽  
High Energy Gamma ◽  
Energy Gamma ◽  
Gamma Ray Emission
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