Dwarf galaxies linked by massive intergalactic gas bridge
Astronomers have made a groundbreaking discovery of a colossal bridge of neutral hydrogen gas linking two dwarf galaxies. The Virgo cluster plays a significant role in this phenomenon.
Galactic Clusters
Articles tagged with Galactic Clusters
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Hungry star is eating its cosmic twin at rate never seen before
Astronomers discovered a greedy white dwarf star consuming its closest celestial companion at an unprecedented rate. The study found that the super-dense white dwarf is burning brightly due to the mass transfer between the two stars, potentially leading to a massive explosion visible from Earth.
‘Bridge’ of stray stars reveals active merger of two galaxy clusters
Researchers used the Dark Energy Camera to image a 'bridge' of diffuse light spanning roughly a million light years between two galaxies in Abell 3667. The findings suggest that the brightest galaxies in the cluster are actively merging, with one larger galaxy stealing stars from a smaller one.
New survey maps hundreds of satellite systems orbiting dwarf galaxies
A new study by Dartmouth astronomers has mapped 355 candidate satellite galaxies around dwarf galaxies, tripling the number previously surveyed. The researchers aim to understand how external conditions influence satellite formation and uncover insights into dark matter's nature.
The Milky Way could be teeming with more satellite galaxies than previously thought
New research predicts the existence of 80-100 additional satellite galaxies surrounding the Milky Way, orbiting at close distances. These 'orphan' galaxies are lost in most simulations but should have survived in the real Universe.
Understanding why galaxy clusters are warm may explain the origin of giant interstellar structures
A team of researchers at Nagoya University has discovered a fast-moving, high-temperature gas flow in the center of the Centaurus cluster of galaxies. This finding may solve the 'cooling flow problem', which explains why galaxy clusters appear to be warm despite emitting X-rays.
Sound frequencies of stars sing of our galaxy’s past and future
A new study by UNSW Sydney researchers has discovered the sound frequencies of a cluster of stars 2700 light years away, allowing scientists to map the history of the Milky Way and other galaxies. The discovery uses oscillation frequencies to determine a star's age and mass, providing insights into galaxy formation and evolution.
“Sloshing” from celestial collisions solves mystery of how galactic clusters stay hot
Researchers have discovered flows of hot gas in the Centaurus Cluster core, shedding light on how galactic clusters stay hot through 'sloshing' caused by collisions. This solves the longstanding mystery of cluster core heating and provides new insights into the formation and evolution of galactic clusters.
Study reveals the Phoenix galaxy cluster in the act of extreme cooling
Astronomers have discovered a key ingredient within the Phoenix cluster that explains its mysterious starburst, using NASA's James Webb Space Telescope to observe the cluster. The detection of warm gas confirms that the Phoenix cluster is actively cooling and able to generate a huge amount of stellar fuel on its own.
First fast radio burst traced to old, dead, elliptical galaxy
Astronomers have traced a fast radio burst to an ancient, dead, elliptical galaxy, shattering assumptions that these events solely emanate from young star-forming regions. The discovery hints at the possibility of diverse origins for FRBs.
Getting the most out of cosmic maps
Researchers have developed a new approach to analyzing cosmic maps, known as field-level inference, which preserves the fidelity of the data and can improve the determination of cosmological parameters by a factor of 3.5 to 5.2 compared to standard methods.
New measurements turn the Hubble tension into a crisis
New measurements of the Hubble constant support a faster-than-expected Universe expansion rate, challenging current understanding of physics. A precise distance measurement to the Coma Cluster provides the foundation for this new result.
Physicists explain a stellar stream’s distinctive features
Researchers found a core-collapsing self-interacting dark matter subhalo is responsible for the peculiar spur and gap features observed in the GD-1 stellar stream. This discovery provides insights into the nature of dark matter itself and offers a new explanation for the observed perturbations.
Beyond the 'Dragon Arc,' a treasure trove of unseen stars
Researchers observed a galaxy nearly 6.5 billion light-years away, revealing a large number of individual stars made visible through gravitational lensing. The discovery provides new insights into the universe's greatest mysteries, including dark matter and stellar populations.
Astrophysics: Mystery of the ‘missing’ binary stars solved
An international team of researchers has found the first binary star in the immediate vicinity of Sgr A* by analyzing individual observations of dust sources. The discovery provides new clues to how young stars form close to the supermassive black hole, solving a long-standing mystery.
Astronomers close to solving mystery of how universe’s giant galaxies formed
Scientists have discovered birth sites of gigantic elliptical galaxies, suggesting large gas flows and galaxy collisions created these ancient systems. The research, published in Nature, may finally unravel the enigma of how these giant galaxies formed.
Study: Early dark energy could resolve cosmology’s two biggest puzzles
A new study proposes that early dark energy could explain the formation of numerous bright galaxies in the early universe, resolving the 'Hubble tension' puzzle. The team modeled galaxy formation with a brief appearance of early dark energy, finding it fits observations and solves both puzzles.
AI helps distinguish dark matter from cosmic noise
A deep-learning algorithm developed by astronomer David Harvey can untangle the complex signals of self-interacting dark matter and AGN feedback in galaxy cluster images. The Inception model achieved an accuracy of 80% under ideal conditions, showcasing its potential for analyzing vast amounts of space data.
Galaxies in dense environments tend to be larger, settling one cosmic question and raising others
A new study published in the Astrophysical Journal has found that galaxies in denser environments are up to 25% larger than isolated galaxies. Researchers used a machine learning tool to analyze millions of galaxies and found a clear trend: galaxies with more neighbors are also on average larger.
Dark matter flies ahead of normal matter in mega galaxy cluster collision
Astronomers have observed the decoupling of dark and normal matter velocities in a massive galaxy cluster collision. The dark matter accelerated ahead of normal matter due to gravity and electromagnetism interactions, offering a unique vantage point for studying this phenomenon.
Another intermediate-mass black hole discovered at the centre of our galaxy
Researchers found an intermediate-mass black hole in star cluster IRS 13 near SgrA*, suggesting it could be a 'seed' for the central supermassive black hole. The discovery provides insights into the galaxy's evolution and the formation of intermediate-mass black holes.
How the 'heart and lungs' of a galaxy extend its life
Astrophysicists suggest that galaxies control growth through how they 'breathe', using supersonic jets to transmit energy and slow gas-accretion. This helps maintain the galaxy medium, keeping the supermassive black hole engine supplied with fuel.
Astronomers find missing link in massive black hole formation
Researchers at the University of Utah and Max Planck Institute have discovered an intermediate-mass black hole in the Omega Centauri cluster, providing crucial evidence for a long-theorized class of black holes. The discovery offers insights into galaxy evolution and the formation history of globular clusters.
Astronomers find the nearest massive black hole, a missing link in massive black hole formation
Researchers have found the nearest massive black hole to Earth, located at the center of Omega Centauri, a galaxy that was swallowed by the Milky Way. The discovery provides insight into the formation history of galaxies and confirms long-held suspicions about the existence of intermediate-mass black holes.
Star clusters observed within a galaxy in the early Universe for the first time
Astronomers have observed five young massive star clusters in the Cosmic Gems arc galaxy for the first time, revealing details about infant galaxies and globular cluster formation. The study uses gravitational lensing to resolve small scales in the distant galaxy, providing a unique window into the early Universe.
Galactic bloodlines: Many nearby star clusters originate from only three "families"
An international team of astronomers found that most nearby young star clusters belong to just three families, which formed in massive star-forming regions. These star clusters also left traces on Earth, including the Local Bubble and iron isotopes in the crust.
News from "El Gordo": Study suggests dark matter may have collisional properties after all
Researchers used numerical simulations to analyze the behavior of dark matter in the giant galaxy cluster El Gordo. The study found that the physical separation between dark matter and other mass components can be explained using the Self-Interacting Dark Matter (SIDM) model.
Medium and mighty: Intermediate-mass black holes can survive in globular clusters
Simulations reveal that dense molecular clouds can give birth to very massive stars that evolve into intermediate-mass black holes. The study provides new insights into the potential mechanisms of intermediate-mass black hole formation, which could have significant implications for our understanding of these enigmatic objects.
VIDEO: Surrey astrophysicists explore new galaxies and streams of stars using new data from Euclid space telescope
Researchers confirm model predicting galaxy clusters' separation via gravity, while identifying potential new galaxies with Euclid's powerful equipment. The telescope's early release observations reveal millions of objects in a single day, opening up new possibilities for dark matter research.
Jumbo discovery: astronomers offer new model for formation of recently discovered “free-floating” planets
Researchers introduce a new model that suggests dense stellar clusters can eject pairs of giant planets, which remain gravitationally bound to each other as they float through space. This discovery fills a critical gap in our understanding of planetary evolution and challenges prevailing theories of planet formation.
Inexplicable flying fox found in Hydra galaxy cluster
A team of astronomers led by Kohei Kurahara discovered a mysterious cloud of magnetized plasma, dubbed the Flying Fox, in the Hydra galaxy cluster. The plasma's shape and location have left scientists baffled, with no known class or host galaxy identified.
Stellar collisions produce strange, zombie-like survivors
Astrophysicists simulated 1,000 stars orbiting the galaxy's central supermassive black hole and found that collision survivors can lose mass to become stripped down low-mass stars or merge with other stars. The likelihood of collision increases for stars closer to the supermassive black hole.
The Radcliffe Wave is waving
Astronomers have discovered a massive, wave-shaped structure in the Milky Way, which is oscillating through space-time. The Radcliffe Wave is approximately 9,000 light years long and moves like a traveling wave, with star clusters along its path moving up and down.
Lightest black hole or heaviest neutron star? MeerKAT uncovers a mysterious object in Milky Way
Researchers found an unknown object orbiting a rapidly spinning millisecond pulsar, weighing more than the heaviest neutron stars and less than the lightest black holes. The discovery was made using the MeerKAT Radio Telescope and could reveal new insights into black holes and neutron stars.
‘Stellar Paternity Tests’ match orphaned stars to their Milky Way origins
Researchers from Lehigh University have successfully mapped 15 orphaned stars to their birth clusters in the Milky Way using Gaia Mission data. The study provides new insights into the galaxy's history and star cluster dynamics.
Astronomers determine the age of three mysterious baby stars at the heart of the Milky Way
Researchers at Lund University have determined the age of three mysterious baby stars at the heart of the Milky Way, finding them to be 100 million to 1 billion years old. The stars' unusual chemical composition also surprised the team, indicating that the galaxy's center may be inhomogeneous.
NASA’s Webb, Hubble combine to create most colorful view of universe
The combined image reveals galaxies outside the cluster, varied sources over time likely due to gravitational lensing, and transients varying in brightness. The team identified 14 such transients across the field, including highly magnified stars or multiple-star systems and supernovae.
NASA’s Webb, Hubble telescopes combine to create most colorful view of universe
Astronomers combined the Webb and Hubble telescopes to capture a detailed portrait of the cosmos, revealing a galaxy cluster about 4.3 billion light-years from Earth. The image showcases magnified supernovae and individual stars, providing insights into the universe's first stars and the forces driving its expansion.
Gas-rich baby galaxies set the early Universe alight
Researchers found almost 90% of early universe galaxies had glowing gas, triggering intense star formation. The James Webb Space Telescope provided unprecedented clarity to study these infant galaxies, revealing their role in shaping the Universe.
Stellar fountain of youth with turbulent formation history in the centre of our galaxy
A young star cluster, IRS13, has been found to be significantly younger than expected, with stars only 100,000 years old, despite being near the supermassive black hole Sgr A*. The cluster's turbulent history suggests it was 'captured' by the black hole's gravity, leading to a bow shock and increased star formation.
Matter comprises of 31% of the total amount of matter and energy in the universe
A team measured galaxy clusters' mass using a technique called MRR, finding that regular matter makes up only 20% of the universe's total matter. The method is competitive to other techniques like CMB observations, demonstrating its potential for constraining cosmological parameters.
Titanic galaxy cluster collision in the early Universe challenges standard cosmology
A new study reveals that a massive galaxy cluster collision at half the Universe's current age is inconsistent with the standard Lambda-cold dark matter (ΛCDM) model. The El Gordo cluster, with a mass 2000 trillion times that of the Sun, challenges the theory's predictions for structure formation and galaxy evolution.
Webb spotlights gravitational arcs in ‘El Gordo’ galaxy cluster
The James Webb Space Telescope has captured a new image of the 'El Gordo' galaxy cluster, revealing dusty objects and distorted background galaxies. Gravitational lensing provides a unique window into the distant universe, allowing scientists to study star formation history and assembly of galaxies.
Astronomers identify the earliest strands of the cosmic web
Scientists discover threadlike arrangement of galaxies, anchored by a quasar, which marks the first time such a structure has been observed at 6% of its current age. The findings provide clues about the fundamental architecture of the universe and the formation of supermassive black holes.
Einstein and Euler put to the test at the edge of the Universe
Researchers from UNIGE have developed a new method to test the validity of Einstein and Euler's theories on the accelerating Universe expansion and dark matter. The study uses time distortion as a never-before-used measure, allowing for differentiation between the two equations.
NASA's Hubble hunts for intermediate-sized black hole close to home
Astronomers using Hubble have found evidence for an intermediate-mass black hole in the globular star cluster Messier 4, weighing approximately 800 solar masses. The discovery uses precise measurements of stellar motion to rule out alternative theories and suggests a single, compact black hole at the center.
Team led by NCKU researcher performs cosmological modeling to shed light on the nature of dark energy
A research group led by NCKU professor I-Non Chiu conducted the first cosmological study on galaxy clusters identified by eROSITA, analyzing 550 galaxy clusters. The results suggest that Dark Energy occupies up to 76% of the total energy density in the Universe.
Celestial monsters at the origin of globular clusters
A team of astronomers has discovered chemical traces of supermassive stars in globular proto-clusters, born 440 million years after the Big Bang. The study suggests that these 'celestial monsters' enriched the original gas cloud with chemical elements, explaining abundance anomalies in their stars.
Webb reveals early-universe prequel to huge galaxy cluster
Astronomers have confirmed a protocluster of seven galaxies at a distance of 650 million years after the Big Bang, which will grow into a massive galaxy cluster resembling the Coma Cluster. The James Webb Space Telescope's spectrographic data revealed high velocities and dark matter halo characteristics.
How to see the invisible: Using the dark matter distribution to test our cosmological model
The Princeton-led team measured the dark matter's 'clumpiness,' finding a value of 0.776 that conflicts with the Cosmic Microwave Background's value of 0.83. The discrepancy suggests the standard model might be incomplete or has an error, prompting further investigation.
Galaxy clusters yield new evidence for standard model of cosmology
Researchers found consistent results between observations and theory, showing that clusters have become more centrally concentrated over time. The study provides strong support for the Lambda-CDM paradigm by demonstrating agreement between the observed and simulated concentration-mass relation of galaxy clusters.
Astronomers witness the birth of a very distant cluster of galaxies from the early Universe
Researchers have discovered a large reservoir of hot gas in the Spiderweb galaxy cluster, which is believed to be on its way to becoming a massive galaxy cluster. The detection was made using ALMA and provides valuable information about the early Universe's structure formation.
Artificial intelligence discovers secret equation for ‘weighing’ galaxy clusters
Astrophysicists used AI to improve mass estimates of galaxy clusters by adding a simple term to an existing equation. The new equation downplays the importance of complex cores in calculations, providing more reliable mass inferences.
Astrophysicists show how to “weigh” galaxy clusters with artificial intelligence
Scholars developed an AI program using symbolic regression to improve mass inferences of galaxy clusters. The new equations extract jelly at the center and concentrate on doughy outskirts for reliable mass inferences.
Pinpoint simulations provide perspective on universe structure
A series of simulations have enabled researchers to probe the heterogeneous structure of the universe by treating galaxy distribution as a collection of points. The study reveals that on large scales, the universe approaches hyperuniformity, while on smaller scales it becomes almost antihyperuniform and strongly inhomogeneous.
Millions of galaxies emerge in new simulated images from NASA's Roman
Scientists have created a synthetic survey that showcases what can be expected from the Roman Space Telescope’s future observations. The simulation contains 33 million galaxies and 200,000 foreground stars, helping scientists plan observing strategies and test data analysis methods.
Star formation in distant galaxies by the James Webb Space Telescope
The James Webb Space Telescope has enabled the detection of compact structures of star clusters inside galaxies, known as clumps. Researchers have studied the link between clump formation and galaxy growth in distant galaxies, providing new insights into the early stages of galaxy formation.
Hubble finds that ghost light among galaxies stretches far back in time
The Hubble Space Telescope has shed new light on the mystery of intracluster light, finding that these stars have been wandering around for billions of years. The survey suggests that these stars were already homeless in the early stages of the cluster's formation, and current theories cannot explain their origin.
Discovering rare red spiral galaxy population from early universe with the James Webb Space Telescope
The James Webb Space Telescope has captured infrared images of a population of red spiral galaxies at unprecedented resolution, revealing their morphology in detail. These galaxies are among the farthest known spiral galaxies and suggest that such spiral galaxies existed in large numbers in the early universe.
The James Webb telescope produces an unparalleled view of the ghostly light in galaxy clusters
The James Webb telescope has observed the intracluster light in galaxy clusters with unprecedented detail, revealing insights into galaxy formation and dark matter. The study demonstrates the potential of JWST for analyzing faint structures like ICL, which can help understand cluster dynamics.