Tag Archive for 'Gamma rays'

MAGIC Telescopes Detect Gamma Rays from Recurrent Nova

Apr 14, 2022 by News Staff

Astronomers using the MAGIC (Major Atmospheric Gamma Imaging Cherenkov) telescopes have detected gamma rays from the 2021 outburst of RS Ophiuchi, a recurrent...

Roth et al. present a calculation of the contribution of star-forming galaxies to the gamma-ray background. Image credit: NASA.

Star-Forming Galaxies Explain ‘Empty Sky’ Gamma-Rays: Study

Sep 16, 2021 by News Staff

Until now, it has been unclear what created gamma-rays that appear in patches of seemingly ‘empty sky.’ Roth et al. present a calculation of the contribution...

Astronomers Detect High-Energy Gamma Rays from Afterglow of Long Gamma-Ray Burst

Jun 4, 2021 by News Staff

Long gamma-ray bursts are bright flashes of extragalactic gamma rays produced during the collapse of a massive star. A gamma-ray burst itself lasts only...

An artist’s impression of a blazar. Image credit: DESY / Science Communication Lab.

TESS Detects Bright, Long-Lasting Gamma-Ray Burst

May 4, 2021 by News Staff

Astronomers using NASA’s Transiting Exoplanet Survey Satellite (TESS) exoplanet-hunting mission have detected the rising and decaying optical afterglow...

An artist’s impression of an antimatter star. Image credit: Sci-News.com.

Antimatter Stars Could Be Lurking in Milky Way

May 4, 2021 by Natali Anderson

Astronomers using data from NASA’s Fermi Gamma-ray Space Telescope have identified 14 candidate antistars — stars made of antimatter — in...

An artist’s impression of an intermediate-mass black hole. Image credit: Sci-News.com.

Astronomers Use Gravitational Lensing Effect to Detect Intermediate-Mass Black Hole

Mar 30, 2021 by News Staff

A gravitationally lensed gamma-ray burst, designated GRB 950830, helped astronomers detect a black hole about 55,000 times more massive than the Sun. An...

This multi-frequency composite VLBA image shows young radio jets originating near a supermassive black hole at the core of the active galaxy TXS 0128+554; the jets in this image started about 80 years ago, stopped, then resumed about 10 years ago. Image credit: Lister et al / Sophia Dagnello, NRAO / AUI / NSF.

Astronomers Observe Young, Radio-Emitting Jets in Distant Active Galaxy

Aug 27, 2020 by News Staff

Around five years ago, NASA’s Fermi Gamma-ray Space Telescope detected high-energy gamma rays coming from TXS 0128+554, an elliptical galaxy located...

An artist’s impression of the magnetar SGR 1935+2154. Image credit: ESA.

Astronomers Detect Short Bursts of Radio Waves from Distant Magnetar

Jul 30, 2020 by News Staff

Using ESA’s International Gamma-Ray Astrophysics Laboratory (Integral), NASA’s Neil Gehrels Swift Observatory and several radio telescopes, astronomers...

V906 Carinae (circled) shines near peak brightness in this image taken on March 23, 2018, three days after the nova was discovered. The beautiful cloud of gas and dust dominating the picture is part of the Carina Nebula. Image credit: A. Maury / J. Fabrega.

Astronomers Track Shock Waves in Nova V906 Carinae

Apr 15, 2020 by News Staff

A nova is a sudden, short-lived brightening of an otherwise inconspicuous star. It occurs when a stream of hydrogen from a companion star flows onto the...

Catastrophic Collapse of Giant Stars’ Magnetic Fields Powers Gamma-Ray Bursts

Apr 9, 2020 by News Staff

Gamma-ray bursts are the most energetic explosions in the Universe, beaming out huge jets of light-emitting plasma, which travel through space at 0.99...

This artist’s impression illustrates how high-speed jets from supermassive black holes would look. Image credit: NASA / ESA / Hubble / L. Calçada, ESO.

Astronomers Observe Relativistic Jet from Two Merging Spiral Galaxies

Apr 8, 2020 by News Staff

Astronomers using the 8.2-m Subaru Telescope report the first unambiguous detection of a relativistic jet — a beam of charged particles that travels...

Astronomers Discover Most Distant Blazar Yet

Mar 11, 2020 by Sergio Prostak

Astronomers using the Large Binocular Telescope have found a blazar 13 billion light-years from Earth, making it officially the most distant blazar ever...

Milky Way’s center produces more high-energy gamma rays than can be explained by known sources. This image shows the Milky Way in visible light and a gamma-ray map from NASA’s Fermi Gamma-ray Space Telescope. Image credit: NASA’s Goddard Space Flight Center / A. Mellinger, Central Michigan University / T. Linden, University of Chicago.

Annihilating Dark Matter May Lurk in Milky Way’s Center

Dec 12, 2019 by News Staff

Gamma rays — the most energetic waves in the electromagnetic spectrum — are typically produced by the hottest, most extreme objects in the...

Do Gamma-Ray Jets Really Achieve Superluminal Speeds?

Sep 26, 2019 by News Staff

High-speed particle jets from gamma-ray bursts may exceed the speed of light in surrounding gas clouds, but do so without violating Einstein’s theory...

An artist’s impression of the GRB 190114C jet over time, and the small patches of magnetic fields. Image credit: Laskar et al.

Astronomers Capture First Polarized Radio Signal from Gamma-Ray Burst

Jun 21, 2019 by News Staff

Gamma-ray bursts (GRBs) are the most energetic explosions in the Universe, beaming out mighty jets which travel through space at 0.99 times the speed of...

Macleod et al analyzed the properties of vacuum Cherenkov radiation in strong laser pulses and the magnetic field around a pulsar. Image credit: Gerd Altmann.

High-Velocity Charged Particles Emit Cherenkov Radiation in Quantum Vacuum

May 6, 2019 by News Staff

According to new research published in the journal Physical Review Letters, charged particles traveling through empty space can emit Cherenkov radiation...

The CTB 1 supernova remnant resembles a ghostly bubble in this image, which combines new 1.5 GHz observations from the Very Large Array (orange, near center) with older observations from the Dominion Radio Astrophysical Observatory’s Canadian Galactic Plane Survey (1.42 GHz, magenta and yellow; 408 GHz, green) along with infrared data (blue). The VLA data clearly reveal the straight, glowing trail from PSR J0002+6216 and the curved rim of the remnant’s shell. Image credit: Jayanne English, University of Manitoba / NRAO / F. Schinzel et al / DRAO / Canadian Galactic Plane Survey / NASA / IRAS.

Astronomers Find Pulsar Hurtling Through Space

Mar 22, 2019 by News Staff

Astronomers using NASA’s Fermi Gamma-ray Space Telescope and NSF’s Karl G. Jansky Very Large Array have spotted a pulsar hurtling through space at...

Blyth et al analyzed the gamma rays emitted during the NPDGamma Experiment and found parity-violating asymmetry, which is a specific change in behavior in the force between a neutron and a proton. They measured a 30 parts per billion preference for gamma rays to be emitted antiparallel to the neutron spin when neutrons are captured by protons in liquid hydrogen. After observing that more gammas go down than up, the experiment resolved for the first time a mirror-asymmetric component or handedness of the weak force. Image credit: Andy Sproles / Oak Ridge National Laboratory, U.S. Department of Energy.

Experimental Physicists Measure Weak Force between Protons and Neutrons in Atom’s Nucleus

Dec 27, 2018 by News Staff

Physicists from the NPDGamma Experiment at the DoE’s Oak Ridge National Laboratory (ORNL) have measured the weak interaction between protons and neutrons...

This map of the entire sky shows the location of 739 blazars used in NASA’s Fermi Gamma-ray Space Telescope’s measurement of the extragalactic background light. The background shows the sky as it appears in gamma rays with energies above 10 billion electron volts, constructed from nine years of observations by Fermi’s Large Area Telescope. The plane of our Milky Way Galaxy runs along the middle of the plot. Image credit: NASA / DOE / Fermi LAT Collaboration.

Astronomers Trace History of Universe’s Star Formation

Nov 30, 2018 by News Staff

Astronomers believe that our Universe began forming the first stars when it was a few hundred million years old. Since then, the Universe has become a...

SS 433 is a microquasar located in the constellation Aquila, some 15,000 light-years from Earth. Image credit: L. Calçada / ESO.

Astronomers Detect Highly Energetic Radiation from Microquasar

Oct 5, 2018 by News Staff

Astronomers have detected gamma rays coming from the outermost regions of an unusual star system within our Milky Way Galaxy. The source is a microquasar...

123 4