Articles tagged with Radio Galaxies
Scientists have found a miniaturized galaxy with a single massive black hole, which produces radio jets that are much more efficient than previously thought. The discovery was made using CSIRO's Compact Array radio telescope and reveals that black holes can be both more powerful and more efficient.
Astronomers discovered a giant black hole with its spin axis pointing in a different direction after two collisions with smaller galaxies. The observations suggest that the black hole was jerked around twice, creating cavities and radio jets.
Radio astronomers have developed a new technique for studying dark energy by mapping large-scale cosmic structures. This method, called intensity mapping, allows them to accumulate radio waves emitted by hydrogen gas in vast volumes of space, revealing insights into the nature of dark energy and its impact on the Universe's evolution.
A team of researchers has made the first detailed observations of 'halo' gas clouds in our Galaxy, finding they contain hydrogen gas 700 times the mass of the Sun. These clouds are linked to earlier star formation and can fall back into the main body of the Galaxy, recycling material.
Astronomers used the Fermi Gamma-ray Space Telescope to map gamma rays emitted by Centaurus A, a galaxy with a supersized black hole. The discovery confirms that microwave photons can be accelerated to gamma-ray energies through inverse Compton scattering.
Astronomers have observed a galaxy 10 billion light-years away, finding four discrete star-forming regions making new stars 250 times faster than the Milky Way. The study reveals exquisite detail of these regions, which are 100 times brighter than nearby galaxies.
Astronomers have found that typical galaxies still hold sufficient quantities of gas and dust for star formation, but their efficiency has slowed down over cosmic time. This means that present-day galaxies form fewer stars due to a decrease in gas and dust supplies rather than a change in their ability to make stars.
The CSIRO has chosen 10 major science projects for its Australian SKA Pathfinder (ASKAP) telescope, which will tackle astrophysical issues and advance the field of astronomy. The projects include a deep survey for star-forming galaxies and a survey for galaxies containing neutral hydrogen gas.
A team of international researchers has challenged the long-held idea that the ratio of massive stars to lighter ones in star-forming regions remains consistent. They found that this ratio, known as the initial mass function, varies significantly between different galaxies, with some forming more low-mass stars than expected.
The NASA Fermi Gamma-ray Space Telescope has discovered a third class of active galaxies that emit gamma rays, opening a new window in the field. The telescope has detected gamma rays from dozens of galaxies beyond our own, including Seyfert galaxies and blazars.
Using a worldwide VLBA collaboration, scientists pinpoint the origin of superenergetic gamma rays coming from M87's core near the supermassive black hole. The discovery sheds light on the mechanisms powering galaxies' energetic jets.
A team of astronomers has directly measured the distance to a galaxy, providing a precise tool for unraveling the mystery of Dark Energy. The technique uses water molecules in disks orbiting central black holes to amplify radio waves, enabling measurements up to 160 million light-years away.
A rare radio supernova has been detected in the nearby galaxy M82, providing valuable opportunities for studying star formation and supernovas. The discovery was made using the Allen Telescope Array, which will also search for intelligent life signals around other stars.
Astronomers have used the world's biggest radio telescope to study the brightest galaxies that NASA's Fermi Gamma-ray Space Telescope can see. The team found a correlation between active galaxies with the brightest gamma-ray emission and those with the fastest jets.
A team of scientists discovered a mysterious screen of extra-loud radio noise permeating the cosmos, preventing astronomers from observing heat from the first stars. The source of this cosmic background remains unknown.
The team found a cosmic puzzle that booms six times louder than predicted, ruling out origins from primordial stars and known radio sources. The source of this cosmic radio background remains a mystery, complicating efforts to detect the first stars in the universe.
A recent study suggests that supermassive black holes formed first and grew before their host galaxies. The ratio of black hole mass to galactic bulge mass is nearly constant across different galaxy sizes and ages. This finding implies that the growth of black holes and galaxies was an interactive process.
Astronomers use gravitational lensing effect to magnify light from quasar MG J0414+0534, detecting water vapour at redshift 2.64, a time when the Universe was only a fifth of its current age
A team of Australian astronomers discovered a puzzling lack of hydrogen gas in distant galaxies, which contradicts expectations based on the Universe's life cycle. The observed absence may be due to the destruction of hydrogen by quasars' intense radiation, leaving behind only ionised particles.
A team of scientists used a natural cosmic lens to capture an image of a distant galaxy in the early Universe. The image shows a massive reservoir of gas and a supermassive black hole feeding a burst of star formation, indicating that the galaxy has collided with another.
A team of scientists has discovered a new population of colliding galaxy clusters that were previously undetected at shorter wavelengths. The discovery confirms theoretical predictions about particle acceleration through turbulent waves generated by violent collisions.
Researchers have directly measured a nascent galaxy's magnetic field, finding it is at least 10 times stronger than the average value in the Milky Way. This unexpected result presents a challenge to the leading theory of magnetic field generation and suggests that magnetic fields may play a key role in the evolution of galaxies.
Researchers have used radio telescopes to study the behavior of Seyfert galaxies, revealing that the majority of them are being consumed by black holes due to interactions with neighboring galaxies. This discovery provides strong evidence for the role of galactic cannibalism in powering these galaxies.
Researchers have discovered a giant hydrogen gas finger in the Milky Way Galaxy, which may indicate that nearby galaxies, such as the Large and Small Magellanic Clouds, will eventually merge with our Galaxy. The study provides valuable insight into the galaxies' fate using CSIRO radio telescopes.
The Arecibo Observatory has discovered methanimine and hydrogen cyanide, two key ingredients for life, in a distant galaxy. These molecules were found by searching for radio emission at specific frequencies, using the world's largest and most sensitive radio telescope.
The University of Manchester is leading UK involvement in the £1.1 billion Square Kilometre Array project, which will create a detailed map of the sky and allow astronomers to test Einstein's theory of relativity and search for signs of alien life.
The AEGIS survey provides a unique combination of deep, intensive observations over a wide area, yielding large samples even of rare types of galaxies. The study reveals a time when galaxies were starting to reach maturity, with high star formation rates and powerful black holes at their centers.
Scientists at Max Planck Institute for Astrophysics have discovered a way to make a picture of everything that gravitates in the Universe using radio telescopes. By analyzing radio waves emitted from the early Universe, they can create high-resolution images of cosmic mass distribution, surpassing current galaxy distortions.
Astrophysicists discover gamma-ray variability on days around M87's central black hole, revealing emission region size of approximately 0.000001% of the galaxy's size. This discovery confirms M87 as a unique extragalactic source and hints at novel production mechanisms for high-energy particles.
Scientists discover an unusual X-ray tunnel large enough to fit the entire Milky Way galaxy inside a galaxy cluster. The tunnel is filled with old particles likely originating from past black hole outbursts, shedding light on the complex battle between the inward flow of hot gas and outward radio jets.
Astronomers have discovered that massive clouds of hot gas in elliptical galaxies are being stirred up by intermittent explosive activity from central super-massive black holes. This finding challenges the long-held assumption that these galaxies are quiet and stable, revealing a more dynamic and stormy reality.
An international team of astronomers has measured the motion of an entire galaxy in the sky using radio telescopes. The measurements show that the galaxy moves at a speed of 190 km/s relative to our Milky Way towards the Andromeda galaxy, and provide insights into the history and future evolution of the Milky Way.
Astronomers have detected an invisible galaxy made mostly of dark matter for the first time using radio telescopes. The discovery was made by a British-led team and confirmed with the Arecibo telescope in Puerto Rico.
Astronomers have discovered a dwarf galaxy surrounded by a gigantic, pristine hydrogen gas disk. The large reservoir of unprocessed matter may hold clues to the early universe's formation.
Research suggests that filaments in the Galactic center are connected to areas of intense star formation, providing a link between thermal and non-thermal radio emission. The discovery sheds light on the phenomenon behind these striking features.
The e-MERLIN network will use optical fibers to increase data capacity and sensitivity, enabling UK astronomers to make important contributions to advancing our understanding of the Universe. The new system will allow for detailed radio images of stars and galaxies with unprecedented resolution.
Astronomers have discovered that distant galaxies in the early Universe will evolve into massive elliptical galaxies through rapid merging of smaller building blocks. The SCUBA camera images show these galaxies caught in the throes of formation, with star formation driven by mergers of older galaxies.
Researchers have obtained near-infrared images of the hot spots in radio galaxy 3C 445 using advanced instruments on the VLT ANTU telescope. The images show synchrotron emission associated with an intergalactic shock, providing evidence of cosmic accelerators far from the galaxy and its main jets.
Researchers David Merritt and Ron Ekers developed a mathematical model suggesting that supermassive black holes merge when their host galaxies collide. The model demonstrates the realignment of larger black holes, resulting in sudden changes in jet direction, which can be observed as X-shaped patterns in galaxy images.
Researchers found enormous cosmic bubbles, dubbed 'ghost cavities,' containing faint radio emissions that may hold magnetic fields. These bubbles could be crucial in creating new stars and shaping galaxy cluster structure.
A massive star's remnant is discovered in the Milky Way galaxy, moving at an incredible speed of 300,000 miles per hour. The black hole, called XTE J1118+480, was gravitationally ejected from a globular cluster and has consumed its companion star.