All articles tagged with #gamma rays
Astronomers say a single excited dark matter model could explain three puzzling signals from the Milky Way's center—the 511-keV gamma-ray line, a 2 MeV continuum, and unusually high ionisation in the Central Molecular Zone—potentially guiding future space missions to test dark matter behavior.
Astronomers using the CHARA Array and other telescopes captured real-time images of two novae (V1674 Herculis and V1405 Cassiopeiae), revealing complex, multi-stage gas outflows and gamma-ray emissions—showing that nova explosions are not single blasts and linking surface nuclear processes to the geometry of ejected material and high-energy radiation.
High-resolution CHARA Array images of 2021 novae V1674 Herculis and V1405 Cassiopeiae reveal complex, jet-driven eruptions in binary white-dwarf systems, including perpendicular outflows and a delayed ejection likely tied to a common-envelope phase. The gamma-ray signals observed by NASA’s Fermi coincide with internal shocks in the debris, linking surface nuclear reactions to high-energy radiation and challenging the idea of novae as simple spherical shells. These findings, published in Nature Astronomy, position novae as natural laboratories for extreme physics.
Scientists using the CHARA Array’s near-infrared interferometry captured high‑resolution images of two novae (V1674 Herculis and V1405 Cassiopeiae), showing non‑spherical, interacting ejecta and fast/slow evolution, with a gamma-ray connection that challenges the idea of a single impulsive explosion.
New analysis of gamma-ray flares from pulsars, active galactic nuclei, and gamma-ray bursts finds no energy-dependent speed of light, placing stricter bounds on Lorentz-violating effects predicted by some quantum gravity theories. The results tighten the allowed violations by about 1.5 orders of magnitude and offer a framework for integrating new data into the SME; in short, SR remains consistent, while the search for quantum-gravity signatures continues.
Scientists may have found the first direct evidence of dark matter using gamma rays detected by NASA's Fermi Telescope, which could mark a major breakthrough in understanding this elusive substance, possibly confirming the existence of WIMPs and their annihilation in the Milky Way's center.
Scientists at CERN recreated cosmic jet conditions using particle accelerators to investigate missing gamma-rays from blazars, finding that plasma beam instabilities are too weak to explain the phenomenon, which supports the idea of relic magnetic fields in intergalactic space. This experiment provides new insights into cosmic jet physics and the universe's magnetic history.
A new study using advanced simulations suggests that the mysterious gamma-ray glow at the center of the Milky Way could be explained by the distribution of dark matter shaped by the galaxy's early mergers, reigniting the debate over dark matter's role in this cosmic phenomenon.
New simulations suggest that the faint glow at the center of the Milky Way could be a signature of dark matter, which may have a flattened, egg-like shape influenced by the galaxy's violent history, bringing scientists closer to confirming dark matter's existence.
New simulations suggest dark matter near the Milky Way's center is flattened, potentially explaining the mysterious gamma-ray glow observed by the Fermi telescope, challenging previous spherical models and opening new avenues for understanding dark matter's nature.
Scientists are investigating a mysterious gamma-ray glow near the center of the Milky Way, which could either be caused by neutron stars or potentially be the first evidence of dark matter particles colliding, though conclusive proof remains elusive and further observations are planned.
Scientists are exploring whether the mysterious gamma-ray glow at the center of our galaxy is caused by dark matter collisions or pulsars. Recent supercomputer simulations suggest the dark matter distribution could be egg-shaped, matching observations, which reopens the possibility that dark matter is responsible. Future observations with the Cherenkov Telescope Array could provide definitive evidence, potentially confirming dark matter's role and advancing our understanding of the universe's most elusive substance.
Scientists are close to confirming the existence of dark matter by studying gamma-ray emissions near the center of the Milky Way, with recent research suggesting that these signals could be caused by dark matter particles or millisecond pulsars, and upcoming telescopes may help differentiate the sources.
Scientists are closer to confirming the existence of dark matter by studying gamma-ray emissions near the center of the Milky Way, with current evidence fitting both dark matter particle collisions and millisecond pulsars as possible sources, and future observations from the Cherenkov Telescope Array may provide definitive answers.
Scientists have observed lightning on Earth producing gamma ray bursts, similar to cosmic events, through multi-sensor analysis, revealing new insights into high-energy atmospheric processes and potential implications for lightning protection and understanding severe storms.