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Gamma Ray Emission

All articles tagged with #gamma ray emission

astronomy2 years ago

"Unraveling the Mysteries of Astrophysical Jet Acceleration and Cosmic Rays"

The SS 433 binary star system, known for its collimated jets of charged particles, has been observed to abruptly reappear as bright X-ray sources around 75 light years from their launch site, with gamma-ray emission detected for the first time by the H.E.S.S. Observatory. The gamma-ray emission shows an energy-dependent morphology, with the highest energy photons detected at the point where the jets reappear, while lower energy photons appear further along each jet, providing new insights into the acceleration and transport of relativistic electrons in astrophysical jets.

via Phys.org|
#astronomy#astrophysical-jet#gamma-ray-emission
astronomy2 years ago

Unprecedented Discovery: Pulsar Emission Shatters Energy Records

Astronomers have discovered the highest-energy outburst of light from a pulsar ever seen, indicating potential new physics around these dense, rapidly spinning dead stars. The gamma-ray output of the Vela pulsar was found to be around 200 times more powerful than average pulsars, with gamma-ray photons reaching 20 tera electron volts (TeV). This suggests that something unexpected is happening around the Vela pulsar and its polar jets, which have been observed to stretch as far as 0.7 light-years. The team proposed several possibilities for the powerful gamma-ray emission mechanism, including accelerated particles outside the standard light-cone zones, well-structured magnetic fields, or the bulk movement of winds from neutron stars. Further investigations will be conducted to understand the acceleration and emission processes in pulsars and their implications for other highly magnetized astrophysical objects.

via Livescience.com|
#astronomy#gamma-ray-emission#high-energy-stereoscopic-system-hess
astronomy2 years ago

Unraveling the Enigma: Astronomers Probe Mysterious Ultra-High Energy Source

Astronomers have investigated a mysterious ultra-high energy gamma-ray source called LHAASO J2108+5157, located about 10,700 light years away. The nature of these ultra-high energy sources is not well understood, so researchers used the VERITAS and HAWC observatories to study the emitted gamma-rays. The observations found no significant emission close to the source, suggesting a leptonic origin of the emission. However, the discovery of a new molecular cloud in the vicinity of LHAASO J2108+5157 indicates that the gamma rays may be produced through the hadronic channel with the molecular cloud as the main target for cosmic ray particles. Further observations and analysis are needed to fully understand the nature of this ultra-high energy source.

via Phys.org|
#astronomers#astronomy#gamma-ray-emission