Articles tagged with Dark Matter
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A team of astronomers has discovered a unique structure of dark matter in the galaxy cluster Cl 0024+17, with a ring shape unlike that of galaxies and hot gas. The discovery is among the strongest evidence for dark matter's existence, supporting theoretical models of its behavior under gravity.
A paper by Lawrence Krauss and Robert Scherrer suggests that matter will dominate over radiation in an ever-expanding universe dominated by dark energy. This means that ordinary matter particles, such as protons and neutrons, will remain stable for trillions of years, potentially allowing life to endure forever.
Researchers used COSMOS field data to measure large-scale distribution of matter, revealing concentration of luminous and dark matter. The 3D map provides insight into the formation and evolution of galaxies and may shed light on dark energy.
Researchers propose explanation for formation of dwarf spheroidals, faint galaxies composed almost entirely of dark matter. Simulations suggest environmental effects, including ram pressure and tidal shocking, strip away luminous matter, leaving behind dark-matter shadow.
Astronomers have created the first 3D map of the universe's dark matter distribution, revealing a web-like structure that confirms conventional theories on how galaxies formed. The map was derived from the Cosmic Evolution Survey and offers unprecedented detail on the large-scale filamentary structure of dark matter.
Researchers have found direct proof of dark matter's existence in a study using state-of-the-art telescopes. The team observed two merging galaxy clusters, revealing massive amounts of non-luminous matter that don't interact with normal matter.
Scientists have discovered large, rotating disc galaxies that formed on a rapid time scale, just 3 billion years after the Big Bang. These findings reveal unprecedented details about the anatomy of these distant proto-disc galaxies, including their gas motions and star formation rates.
A team of scientists at the University of Chicago has verified the main features of the cold dark matter model by comparing supercomputer simulations to recent astronomical observations. The simulations accurately reproduced the distribution of galaxies in the early stages of the universe's evolution.
A team of astronomers studied the most massive and hot known fossil group, RX J1416.4+2315, to understand its formation. They found that a high-temperature halo extending over three million light years indicates the cluster's large mass.
A Cornell University study reveals that galaxies in the early universe tend to cluster near large clumps of dark matter. The research uses data from the Spitzer Wide-area InfraRed Extragalactic survey and confirms that ultraluminous infrared galaxies are precursors to galaxy clusters.
Researchers have charted a warp in the Milky Way's hydrogen gas layer, finding it vibrates like a drum due to interaction with dark matter. The Magellanic Clouds' passage through the dark matter halo creates a wake that enhances their gravitational influence on the disk.
Astronomers have created detailed maps of invisible dark matter in two young galaxy clusters, lending credence to the theory that galaxies form at dense regions of cosmic webs. The study used the Hubble Space Telescope's Advanced Camera for Surveys to overcome atmospheric turbulence and measure subtle gravitational lensing effects.
A recent study published in Nature refutes previous claims of missing dark matter in elliptical galaxies, suggesting that massive dark-matter halos are present around these galaxies as well. The research uses simulations of galaxy mergers to explain the observations made by earlier studies.
Researchers used simulations to show that dark matter halos are detectable in disk galaxies, but their absence in elliptical galaxies can be explained by the merger process. The study provides new insights into the formation and evolution of elliptical galaxies.
Researchers have created a method to monitor RNA synthesis and promoter activity in real-time within a single living cell. This breakthrough could help understand the role of RNA molecules in controlling gene expression and may lead to new discoveries in drug development and biology.
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.
Scientists at Ohio State University and colleagues have discovered a sizeable chunk of the universe's missing baryons, estimated to match the amount that went missing 10 billion years ago. The finding suggests dark matter may be responsible for the gas's presence in super-hot rivers surrounding galaxies.
The SDSS team detected ripples in the galaxy distribution made by sound waves, providing evidence that galaxies grew via gravity. The findings support the standard cosmological model and provide insights into dark matter and dark energy's properties.
A Yale astronomer and her colleagues used gravitational lensing techniques to create a spatial map demonstrating the clumped substructure of dark matter inside galaxy clusters. The study found an excellent agreement between observations and theoretical predictions, supporting the concordance model.
Astronomers have detected high-energy gamma rays emanating from the center of the Milky Way galaxy, sparking debate about the nature of these mysterious emissions. The observation suggests a giant supernova explosion as the possible source, which could accelerate cosmic gamma rays to unprecedented energies.
The Quantum Universe report outlines nine fundamental questions in response to research funding agency requests, focusing on particle physics' role in understanding dark matter, dark energy, and more. The report emphasizes new knowledge from particle physics is needed to answer exciting scientific questions of this century.
Theoretical physicist Robert J. Scherrer proposes a model that explains dark matter and dark energy as two sides of the same coin, using an exotic form of energy called scalar fields. This unifying idea avoids previous problems and could potentially explain the mysterious phenomena.
Astrophysicists have found a solution to the long-standing problem of dwarf galaxies in supercomputer simulations, validating the cold dark matter theory. The new simulations suggest that small dwarf galaxies could have been more massive in the past and formed stars before being consumed by larger galaxies.
The CDMS II experiment has narrowed the search for WIMPs, a type of dark matter particle. The results show that the interaction rate of a WIMP with ordinary matter should be less than one interaction every 25 days per kilogram of germanium.
A study suggests that debris from the gobbled-up Sagittarius dwarf galaxy may be 'smoking gun' for detecting dark matter's WIMPs. The combination of WIMPs from the Milky Way and Sagittarius could produce a distinct pattern on the DAMA detector, confirming their existence.
Astronomers have found evidence of rapid galaxy formation in the early universe, including ultra-massive black holes and mature galaxies that formed at an unprecedented rate. This discovery poses a significant challenge to the cold dark matter theory, which predicts galaxies formed through a bottom-up process.
Astronomers have detected a lensed quasar more than twice as wide as any previously reported, offering insights into dark matter and its distribution. The discovery provides evidence for the presence of massive galaxy clusters, which can be used to study dark matter.
Dark matter forms smaller clumps that resemble galaxies and globular clusters in our luminous universe. Computer simulations show these clumps have intricate substructures and dynamic lives independent of visible matter, leading to a template for the visible universe.
Researchers at UCLA created a 30-cm diameter plasma laser by applying a nonuniform magnetic field. Meanwhile, scientists have made rapid advances in detecting dark matter using weak gravitational lensing experiments. A paper also examines the emerging behavior of complex systems in electronic bidding on online auction sites like eBay.
The study provides strong support for the popular cold dark matter model of the universe, suggesting that galaxies are surrounded by massive, three-dimensional halos. The team measured the shapes of over 1.5 million distant galaxies using weak gravitational lensing, revealing that dark matter halos extend far beyond visible stars.
The team reconstructed a mass map of the galaxy cluster using NASA/ESA Hubble Space Telescope data, tracing dark matter's distribution with respect to galaxies. The study reveals that dark matter clumps together in certain regions, supporting the idea that clusters assemble through the merger of smaller groups.
Physicists at the University of California, Irvine have discovered superweakly interacting massive particles (superWIMPs) that may constitute up to one-quarter of the universe's mass. These new particles are predicted to be stable and could provide an alternative explanation for dark matter.
Scientists using Whipple Observatory gamma-ray telescope discover energetic gamma-ray flares from active galaxies, revealing relativistic jets and compact emission regions. The study also holds promise to reveal nature of 'dark matter' and 'dark energy', which dominate universe's mass budget.
Astronomers have found evidence for dark dwarf galaxies that support the theory of cold dark matter. The study analyzed gravitational lensing effects on distant galaxies, revealing the presence of hundreds of invisible dwarf galaxies surrounding large galaxies.
Researchers from Ohio State University have successfully measured the mass of a gravitational microlens in a dim binary star system 6,500 light-years away. This technique could be used to detect dark matter within our galaxy and help explain the missing mass of the universe.
Astronomers have shed new light on dark matter distribution by tracing it closely to galaxy patterns. They found that dark matter is distributed in a parallel pattern to galaxies and makes up about seven times more mass than ordinary matter.
A team of astronomers has directly observed a Dark Matter object, confirming the theory that it consists of small, faint stars in galaxies like our Milky Way. The detection was made using the Hubble Space Telescope and the European Southern Observatory's Very Large Telescope.
Researchers from the Lawrence Livermore National Laboratory have detected a dark matter object in the Milky Way using microlensing light data and spectroscopy. The team measured the mass, distance, and velocity of the MACHO, a small star with a mass between 5% and 10% of the sun's mass at a distance of 600 light-years.
Researchers have detected a massive compact halo object, or MACHO, using gravitational microlensing event data from the Hubble Space Telescope and European Southern Observatory's Very Large Telescope. The object is estimated to be 5-10% the mass of the sun and is thought to comprise up to 50% of the Milky Way's dark matter content.
The universe consists mostly of mysterious dark matter and dark energy, which make up 95% of its mass. Ordinary matter accounts for only 5%, a finding confirmed by observations of the cosmic microwave background.
Researchers used supercomputer simulations to test two competing scenarios explaining high-redshift galaxies. The collisional starburst scenario, which suggests small galaxies trigger intense bursts of star formation, received strong support from the simulation results.
The Inner Space/Outer Space II Symposium will explore questions of the hour in particle astrophysics, including the origins of the universe and dark matter. The four-day agenda includes presentations on Extra Dimensions, the Accelerating Universe, and Beyond the Standard Models.
Qaisar Shafi's research proposes two distinct components of dark matter, with the 'cold' component residing in galaxy haloes and the 'hot' component gravitationally trapped by large-scale structures. This new understanding could guide experimental work and incorporate dark matter into models of the universe.
A team of astronomers used a supercomputer to simulate the growth of cosmic structure in a region comparable to the entire observable Universe. The simulation revealed patterns of dark matter walls and filaments, as well as massive voids and giant galaxy clusters.
Case Western Reserve University physicist Glenn Starkman has received a four-year, $200,000 NSF grant to study the shape of the universe by mapping temperature fluctuations throughout space. He aims to develop new techniques to detect dark matter, which is believed to comprise much of the mass in the universe.
Researchers have found evidence of a 'missing' form of ordinary matter, known as baryonic matter, that was thought to be needed to form the cosmos billions of years ago. The findings suggest that this matter was spread throughout intergalactic space in a diffuse gas of hydrogen and helium atoms.