Articles tagged with Blazars
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A study analyzed 145 blazars to understand the contribution of gamma-ray flares to neutrino emission. Researchers found that blazars with lower flare duty cycles and energy fractions are more numerous, indicating a correlation between their flare activity and neutrino production.
Researchers characterize 106 dim blazars to test the blazar sequence theory, exploring black hole growth and general relativity. The study reveals that lower-energy peaks for dim blazars peak in blue, higher-energy light, extending current knowledge of the pattern.
Astronomers have discovered a galaxy with a unique activity in its core, leading to a reclassification as a giant radio galaxy. The PBC J2333.9-2343 galaxy has a blazar at its center with jets that changed direction drastically by up to 90 degrees.
The Fermi Gamma-ray Space Telescope has captured a dynamic animation of the gamma-ray sky, revealing frenzied activity over nearly 15 years. The data, now publicly available, includes records of source brightness changes and sheds light on blazars and multimessenger astronomy.
A team of scientists led by Clemson University's Marco Ajello has provided conclusive evidence that astrophysical neutrinos come from blazars, which are powerful black holes. This breakthrough resolves the long-standing question about the origin of high-energy cosmic rays.
An international research team has shed light on the origin of neutrinos, shedding new evidence that blazars can be confidently associated with astrophysical neutrinos. The study utilizes neutrino data from the IceCube Neutrino Observatory and BZCat catalogue to establish a connection between high-energy neutrinos and galactic nuclei.
Researchers have found evidence for two supermassive black holes orbiting each other every two years, with masses hundreds of millions times larger than our sun. The quasar's radio-light brightness exhibits sinusoidal variations due to the pair's motion, providing a nearly perfect light curve.
Researchers have found that the polarisation plane of visible light in blazars sometimes rotates, coinciding with repeated gamma ray bursts. The study also described the structure of the inner part of the jets, revealing a fast spine surrounded by a slower sheath with ring condensations.
Astronomers observed a galaxy 12.8 billion light-years from Earth, revealing previously unseen details in its jet of material ejected at three-quarters the speed of light. The analysis supports theoretical models for blazar rarity in the early universe.
Sara Buson aims to confirm blazars as the most important extragalactic neutrino sources, revolutionizing our understanding of blazar astrophysics. She will analyze a large sample of observations and physical data to establish a new framework for multimessenger studies.
Researchers discovered a correlation between the unresolved gamma-ray background and matter distribution in the distant universe, suggesting that dark matter could be a source of the faint cosmic glow. The study used data from the Dark Energy Survey and Fermi Gamma-ray Space Telescope to analyze the correlation.
Using Hawaii-based telescopes, scientists have identified TXS 0506+056 as a known blazar source of high-energy neutrinos. The discovery uses a combination of ground and space-based observatories to pinpoint the source's location.
The VERITAS array confirmed detection of gamma rays from a supermassive black hole, potentially the first astrophysical source of high-energy cosmic neutrinos. This discovery may shed light on the acceleration mechanisms that create cosmic rays.
Astronomers have identified a blazar, TXS 0506+056, as the probable source of a high-energy neutrino detected by IceCube. The National Radio Astronomy Observatory's Karl G. Jansky Very Large Array (VLA) provided clues about the blazar's radio emission.
The discovery provides evidence for a known blazar as a source of high-energy neutrinos detected by the National Science Foundation-supported IceCube observatory. The observations resolve a century-old mystery about what creates and launches cosmic rays, which are highly energetic particles that continuously rain down on Earth from space.
Astrophysicists have localized a high-energy cosmic neutrino originating outside the Milky Way to a blazar in the Orion constellation using MAGIC telescopes and IceCube detector. The observation provides insight into the origin of cosmic rays, which are believed to be accelerated by protons in the blazar's jets.
Researchers discovered a blazar, a giant elliptical galaxy with a massive black hole, is the source of high-energy cosmic neutrinos detected by IceCube Observatory. The discovery resolves a century-old mystery about what creates and propels cosmic rays.
A Drexel University astrophysicist and her colleagues have proven the origin of high-energy particles called neutrinos, revealing they come from blazars with spinning supermassive black holes. This discovery opens up new avenues for understanding the universe's formation and evolution.
An international team of scientists has found evidence of a far-distant source of high-energy particles called neutrinos, an energetic galaxy about 4 billion light years from Earth. The discovery was made using the IceCube Neutrino Observatory and confirms that this galaxy is a cosmic ray accelerator.
A breakthrough in the search for cosmic particle accelerators has been made by tracing a single neutrino back to a galaxy over three billion light years away. The discovery was made using an internationally organized astronomical dragnet and confirms that high-energy cosmic rays are produced in cosmic particle accelerators.
Researchers from Technical University of Munich have determined the cosmic origin of highest-energy neutrinos, finding they emanate from a galaxy four billion light-years away. The team used open access archive data and specialized software to rule out other origins, confirming blazar TXS 0506+056 as the source.
Researchers discovered a blazar, TXS 0506+056, producing high-energy neutrinos in multiple bursts, confirming the source of previously detected astrophysical neutrinos. The 'flaring state' observations were made when the neutrino signal arrived in September 2017, with bright emission across multiple wavelengths.
A team of University of Alabama professors, led by Dr. Marcos Santander, have discovered evidence of an active galaxy emitting neutrinos, which could revolutionize our understanding of the universe. The findings were published in the journal Science and mark a significant breakthrough in multimessenger astronomy.
Researchers from the University of Leicester played a key role in discovering the origin of 'ghost particles' - high-energy neutrinos and cosmic rays. A global network helped identify a known blazar as the source of these particles, providing new insights into the universe's most distant energy sources.
A research group led by IceCube scientist Elisa Resconi provides evidence that the particles detected by the IceCube neutrino telescope originate from a galaxy four billion light-years away. The team used open access archive data to examine a 1.33-degree sky region around the position of the high-energy neutrino, and found only one bla...
Research suggests that small galaxies with smaller black holes can also produce powerful gamma-ray jets, a phenomenon previously thought to be exclusive to massive galaxies. This discovery has the potential to shift our understanding of astrophysics and blur the lines between different types of active galaxies.
Researchers used over 40 telescopes to observe a rare event: the blazar CTA 102 increased its brightness by 3,500 times. The team found that the jet's radiation and particles emit in multiple frequencies from different zones, creating a serpentine shape. This discovery supports theoretical models of jet instability and propagation.
Researchers at Kazan Federal University studied blazar CTA 102 and found a twisted inhomogeneous jet changing its orientation and rotation. This discovery helps explain long-term trends in spectral variability and brightness.
A team of scientists from Clemson University has discovered five ancient galaxies with extremely powerful supermassive black holes, emitting billions of times more energetic gamma rays than visible light. The oldest known gamma-ray blazars were previously thought to be over 2 billion years old.
Astronomers discover five new gamma-ray blazars with massive black holes, challenging current ideas on their formation and growth. The discoveries suggest that these objects could have formed rapidly in the universe's early history.
Astronomers have linked a record-breaking cosmic neutrino, Big Bird, detected in 2012 to a powerful outburst from the black hole at PKS B1424-418. The association is supported by data from NASA's Fermi Gamma-ray Space Telescope and other space-based observatories.
A team of scientists has linked a record-breaking neutrino detected by IceCube to an explosion in the galaxy PKS B1424-418, which was observed in 2012. The researchers calculated a 5-percent probability that the two events were unrelated.
Astronomers observed gamma rays from PKS 1441+25, a blazar galaxy 7 billion years away. The high-energy light revealed a single region far from the power source, contradicting previous assumptions.
Astronomers observed a record-setting flare from the blazar galaxy 3C 279, which became four times brighter than the brightest persistent source in the gamma-ray sky. The rapid fading of the flare was detected by NASA's Fermi Gamma-ray Space Telescope and other satellites.
Researchers have localized the origin of high-energy gamma radiation in a jet emanating from a distant supermassive black hole. The discovery was made possible by a micro-gravitational lens effect that selectively amplifies light from different regions close to the event horizon.
Astronomers have found evidence that two classes of blazars represent different sides of the same cosmic coin, with one class being a gas-guzzling car and the other an energy-efficient electric vehicle. The team's redshift survey revealed that FSRQs began to decline while BL Lacs increased in numbers around 5.6 billion years ago.
The team detected a series of bright gamma-ray flares from a source known as B0218+357, located in a gravitational lens system. The gamma-ray delay is about a day longer than radio observations report for this system, and the region emitting gamma rays is very small compared to those emitting at lower energies.
Researchers used blazar observations to estimate the extragalactic background light (EBL) by measuring the attenuation of high-energy gamma rays. By applying this methodology to blazars at different distances, they were able to study EBL evolution and characterize its build-up over cosmic time.
Researchers set lower limit for blazar's redshift, indicating distance of at least 7.4 billion light-years, challenging current models of blazar emission mechanisms and extragalactic background light propagation.
The most distant known source of very high-energy gamma rays, PKS 1424+240, deviates from expected emission spectrum despite being detected at a great distance of over 7.4 billion light-years. The findings may indicate new insights into blazar emission mechanisms or the extragalactic background light.
A new study using data from NASA's Swift satellite and Fermi Gamma-ray Space Telescope shows that high-speed jets launched from active black holes possess fundamental similarities regardless of mass, age or environment. The result provides a tantalizing hint that common physical processes are at work.
Using data from NASA's Fermi Gamma-ray Space Telescope, scientists measured the most accurate amount of starlight in the universe and determined the extragalactic background light (EBL), also known as cosmic fog. The EBL is a fossil radiation field created by ancient starlight that continues to travel through the universe.
Drs. Blazar and June will present their lecture on adoptive T-cell therapy, which has potential to establish tolerance to hematopoietic or solid organs allografts, treat autoimmunity, and promote immunity to cancer and chronic infection. The researchers have made significant contributions to advancing the field of BMT.
University of Minnesota researchers have discovered a method to quickly and exponentially grow regulatory T-cells, which can help patients avoid severe immune reactions after bone marrow or organ transplants. The new technique has already shown promising effects in treating acute graft-versus-host disease.
Astronomers have identified the brightest source in the gamma-ray sky, with galaxy 3C 454.3 emitting flares 10 times brighter than its summer levels. The blazar's exceptional brightness is due to its orientation, with a jet aimed straight at Earth.
The Fermi telescope captured a hypnotic froth of gamma rays, revealing active galaxies called blazars flare up and fade out. The movie shows the entire sky as northern and southern halves, with bright colors indicating greater numbers of detected gamma rays.
An international team of astrophysicists used simultaneous observations from optical, X-ray, and gamma-ray telescopes to uncover complex changes in PKS 2155-304's radiation. The findings challenge current theories on how radiation is generated in blazars.
Researchers found a blazar, an enormous source of energy from a supermassive black hole, which is one billion years old. The discovery sheds light on the formation of stars and galaxies, offering insights into the universe's early evolution.
A team of astronomers at the University of Wisconsin-Madison developed a new optical technique that enables gamma-ray telescopes to quickly identify TeV blazars, reducing identification time from three months to just one day. This breakthrough may provide insight into black hole physics and the origin of cosmic rays.