Articles tagged with Astroparticle Physics
The H.E.S.S. Observatory detected gamma-ray emission from the outer jets of SS 433, revealing a shift in energy-dependent morphology. This suggests strong shock acceleration, where high-energy particles collide with photons, producing x-ray radiation and explaining the X-ray reappearance of the jets.
Astronomers have found an unexpected gamma-ray signal outside of our galaxy, with a magnitude 10 times greater than expected from Earth's motion. The discovery is linked to the highest-energy cosmic rays and may be related to unidentified sources producing both gamma-rays and ultrahigh-energy particles.
The newly discovered galaxy Nube has a set of specific properties that distinguish it from previously known objects, including being ten times fainter and ten times more extended than other dwarf galaxies. Its unusual characteristics challenge the current understanding of the universe, particularly the dark matter model.
A new unified model confirms that some long-lasting gamma-ray bursts are created in the aftermath of cosmic mergers that spawn an infant black hole surrounded by a giant disk of natal material. The findings explain recently observed long GRBs that astronomers couldn't link to collapsing stars.
A new study using CALET data finds evidence for nearby, young sources of cosmic ray electrons, contributing to a greater understanding of the galaxy. The study suggests that these high-energy electrons originate in supernova remnants, offering insights into the galaxy and its sources.
Researchers from Helmholtz-Zentrum Dresden-Rossendorf are studying near-Earth cosmic explosions to understand their potential impact on the Earth's biosphere. They found that ejected debris can reach our solar system, with some isotopes, such as iron-60 and plutonium-244, potentially coming from supernovae or other galactic events.
Researchers at Tokyo University of Science have discovered a method to generate molecular ions from an ionic crystal by bombarding it with positrons. This breakthrough could lead to new applications in materials science, cancer therapy, and quantum computing.
Scientists propose that pulsars could detect dark matter by observing a subtle additional glow. If axions are produced in strong electromagnetic fields around pulsars, they could convert into observable light.
Researchers at the University of Toronto have made a breakthrough in understanding dark matter and its impact on the universe's large-scale structure. By analyzing cosmic microwave background data and galaxy clustering patterns, they suggest that ultra-light axion particles could account for the observed lack of clumpiness.
The CALorimetric Electron Telescope (CALET) study found that the movement of cosmic rays is affected by the Sun's magnetic field, causing fluctuations in galactic cosmic rays reaching Earth. The research indicates that electrons are more susceptible to solar modulation than protons.
The CALET team, including researchers from Waseda University, found that cosmic ray helium particles follow a Double Broken Power Law, indicating spectral hardening and softening in high-energy ranges. This deviation from expected power-law distribution suggests unique sources or mechanisms accelerating and propagating helium nuclei.
A team of scientists at the University of Bern's Albert Einstein Center for Fundamental Physics has successfully narrowed the scope for the existence of dark matter using a precision experiment with neutron spin clocks. The results excluded axion-like particles and set new limits on dark matter existence.
Astronomers have long sought the launch sites for high-energy protons in our galaxy, and NASA's Fermi Gamma-ray Space Telescope has confirmed that a supernova remnant is just such a place. The shock waves of exploded stars boost particles to speeds comparable to light, producing a tell-tale glow in gamma rays.
Daya Bay Reactor Neutrino Experiment has produced the most precise measurement yet of theta13, a key parameter for understanding how neutrinos change their 'flavor.' The result will help physicists explore mysteries surrounding matter and the universe.
Researchers find that black holes go through a 'hard' and 'soft' state during outbursts, with the final flash possibly indicating a brief expansion of the corona. The findings help scientists understand how supermassive black holes shape galaxy formation.
Researchers at Brookhaven Lab propose a cosmological phase transition as the key to supermassive black hole formation in the early universe. This process, facilitated by ultralight dark matter particles, enabled efficient collapse of matter into black holes.
Physicists at Technical University of Munich discover potential existence of tetra-neutron, a bound state of four neutrons, which could significantly alter our understanding of nuclear forces. The experiment's results suggest a half-life of 450 seconds and stability comparable to the neutron.
A team of astrophysicists led by Boston University's Merav Opher has made a groundbreaking discovery about the heliosphere, the bubble surrounding our solar system. Their research suggests that neutral hydrogen particles play a crucial role in shaping the heliosphere's structure and stability.
GSI/FAIR researchers aim to study properties of hypernuclei, which could shed light on neutron star phenomena. The WASA detector will help determine binding energy and lifetimes with higher detection efficiency.
A Caltech researcher has found that the Schrödinger Equation governs the evolution of massive astrophysical disks. The equation, typically used for subatomic systems, describes how warps and distortions emerge in these disks over millions of years. This surprising discovery could provide new insights into complex astronomical phenomena.
The Super-Kamiokande detector is equipped with a new computer system to monitor neutrinos from nearby supernovae in real-time. This allows scientists to assess the significance of signals within minutes and issue early warnings to research centers worldwide.
A systematic review presents the state of the art in investigating the existence of grains in space-time, which could lead to violations of special relativity. Physicists have devised methods to test these deviations using high-energy astrophysics phenomena.
A University of Colorado Boulder research team has confirmed a theory about charged dust in space, explaining how it affects spacecraft and astronauts. The study used an experiment to levitate particles with positive charge above the moon's surface.
A team of scientists identified Io as the dominant source of the Jovian dust streams, which are high-rate bursts of submicron-sized particles. The particles' motion is strongly influenced by Jupiter's magnetic field, providing a unique signature that could only be present if Io were the dominant source.
Deep Space 1, a miniaturized space probe powered by solar-electric propulsion, will navigate through space and analyze charged particles and magnetic fields surrounding an asteroid and two comets. The mission, led by CU-Boulder Professor Fran Bagenal, tests innovative technologies and aims to explore the outer solar system.
The CU-Boulder payload, dubbed COLLIDE, analyzes the gentle collisions of dust particles in space to understand the dynamics of larger particles. Four different impact speeds and two different depths of dust will be tested to shed light on the mysterious disappearance of dust from planetary ring particles.
A team at University of Colorado at Boulder has found a faint, doughnut-shaped ring of interplanetary and interstellar dust orbiting Jupiter. The ring is much larger and more sparse than previously detected rings, and most particles in it move in the opposite direction to Jupiter's rotation.
A new study led by a University of Colorado astrophysicist suggests that dust grains dominating Jupiter's peculiar ring may have lifetimes of just hours or days. The study indicates the swelling of the inner ring is caused by positive electrical charges on the dust grains resulting from solar radiation.