Tag

Gamma Rays

All articles tagged with #gamma rays

space1 day ago•74 min saved

Magnetar-powered gamma glow lights up a distant supernova

NASA’s Fermi detected gamma rays from the luminous core-collapse supernova SN 2017egm (NGC 3191, about 440 million light-years away), supporting the idea that a newborn magnetar—an ultra‑magnetized neutron star—powers the explosion. A magnetar wind nebula and related particle interactions could boost gamma-ray production and reprocess energy into visible light, explaining the unusually bright display; gamma rays begin to leak out as debris expands, with the early light curve matching models though late-time fading remains puzzling. The study also notes the upcoming Cherenkov Telescope Array could detect similar events up to ~500 million light-years, advancing understanding of magnetar engines. The work appeared in Astronomy & Astrophysics on May 20, 2026.

via Space|

#gamma-rays #magnetar #neutron-star

space2 months ago•4 min saved

Milky Way Center Signals Point to Excited Dark Matter

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.

via BBC Sky at Night Magazine|

#astrophysics #dark-matter #excited-dark-matter

space4 months ago•3 min saved

Novae Unveiled: Real-Time Interferometry Reveals Multi-Stage Ejections and Gamma Rays

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.

via Futurism|

#binary-star #gamma-rays #interferometry

space4 months ago•26 min saved

Novae Unleash Dual Jets: High-Res Images Rewrite Stellar Explosions

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.

via ZME Science|

#binary-system #gamma-rays #interferometry

space4 months ago•6 min saved

High‑Res Imaging Reveals Dual Ejecta in Nova Explosions

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.

via WIRED|

#ejecta #gamma-rays #interferometry

science4 months ago•8 min saved

Gamma-Ray Tests Tighten Lorentz-Invariance Bounds, Not Break Special Relativity

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.

via Hackaday|

#gamma-rays #lorentz-invariance #quantum-gravity

science5 months ago•3 min saved

Scientists Claim First Direct Evidence of Dark Matter Detection

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.

via ScienceDaily|

#dark-matter #fermi-telescope #gamma-rays

science6 months ago•4 min saved

Scientists Recreate Cosmic Fireballs at CERN to Uncover Gamma-Ray Mysteries

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.

via Space|

#black-holes #cern #cosmic-fireballs

science7 months ago•3 min saved

Mysterious Galactic Glow May Reveal Dark Matter Secrets

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.

via SciTechDaily|

#cosmological-simulations #dark-matter #galactic-center

science7 months ago•3 min saved

Hidden Glow in the Milky Way Suggests Dark Matter Activity

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.

via Space|

#cosmology #dark-matter #fermi-telescope

science7 months ago•5 min saved

Mysterious Galactic Glow May Confirm 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.

via Live Science|

#cosmic-puzzle #dark-matter #galactic-center

science7 months ago•2 min saved

Scientists Edge Closer to Confirming Dark Matter in the Milky Way

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.

via Gizmodo|

#astronomy #dark-matter #gamma-rays

science7 months ago•6 min saved

Scientists Explore Dark Matter as Source of Milky Way's Mysterious Glow

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.

via CNN|

#cosmology #dark-matter #fermi-telescope

science7 months ago•3 min saved

Scientists Near Confirmation of Dark Matter

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.

via KSL.com|

#cosmology #dark-matter #fermi-telescope

science7 months ago•4 min saved

Scientists Edge Closer to Confirming Dark Matter in the Milky Way

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.

via Reuters|

#cosmology #dark-matter #fermi-telescope