Articles tagged with Galaxy Formation
Chinese astronomers have discovered that optical variability in emission-line galaxies (ELGs) is likely caused by star-formation activity rather than supermassive black holes. By analyzing images of ELGs from the COSMOS field, researchers found less than 3% show significant variability.
Researchers have detected intra-group light, a faint glow between distant galaxies, and studied its properties. The stars in this light are younger and less metal-rich than surrounding galaxies, suggesting they were stripped from their home galaxies by massive satellite galaxies.
Astronomers using the VLA discovered that fast-moving cosmic ray electrons drive winds in the neighboring galaxy M33, slowing down new star formation. This finding challenges previous theories, suggesting cosmic rays are a more general cause of galactic winds.
A team of researchers using the Five-hundred-meter Aperture Spherical Telescope (FAST) has discovered a massive atomic gas structure, approximately 2 million light years in length, surrounding the compact group of galaxies Stephan's Quintet. This finding challenges current theories on galaxy-group formation and evolution.
Astronomers have discovered a rare system featuring a black hole spewing a jet at a neighboring galaxy, providing insights into radio jet feedback and its impact on star formation. The unique nature of RAD12 has allowed researchers to study the interaction between the black hole's jet and the companion galaxy.
The James Webb Space Telescope has discovered that polycyclic aromatic hydrocarbons (PAHs) can survive in the vicinity of supermassive black holes at the centers of active galaxies. This challenges previous studies that predicted their destruction, and reveals new insights into galaxy evolution.
The study finds that galaxies with bigger bulges tend to spin perpendicular to filaments, while smaller-bulged galaxies spin parallel. Galaxy mergers cause spin flips as galaxies move along filaments.
Researchers using JWST's First Deep Field image identified the most distant globular clusters, potentially relics of the first and oldest stars. These discoveries provide a detailed look at the earliest phase of star formation, confirming JWST's power in uncovering the universe's origins.
Astronomers detect massive light burst from 'infant' Universe, revealing properties of cosmic explosions. The GRB was triggered by a space explosion that occurred when the Universe was less than 900 million years old.
Scientists discovered that the galaxy stopped forming stars because most of its gas fuel was thrown out of the system as it merged with another galaxy. The result is a first for ALMA scientists and challenges long-held theories about galaxy mergers and deaths.
Researchers from the University of Bonn found that dwarf galaxies in one of Earth's nearest galaxy clusters show signs of disturbance without dark matter halos. The study's results contradict previous models, suggesting an alternative gravity theory might be more accurate.
The FAST HI survey has discovered 544 HI-detected galaxies, including 16 that have no optical counterparts, sparking interest in galaxy formation theory. These 'dark' galaxies may represent a new type of object containing dark matter and HI gas but few stars.
A UMass Amherst undergraduate student's work has provided key insight into how galaxies evolve, linking supermassive black hole growth to star formation. The study uses mid-infrared spectra to quantify the connection between these phenomena, paving the way for the James Webb Space Telescope to investigate galaxy evolution.
Researchers discovered compact starburst galaxies cloaked in thick dust clouds that contributed significantly to the total star formation rate. The study found that previous estimates of gas masses were overestimated by a factor of 2-3 due to light being blocked inside the clouds.
Researchers at University of Cologne and Masaryk University discovered a star, S4716, orbiting Sagittarius A* in just four years and reaching speeds of 8000 kilometers per second. The study sheds new light on the origin and evolution of fast-moving stars near black holes.
Researchers have detected the most distant galaxy rotation ever observed, suggesting an initial stage of rotational motion development. The galaxy's rapid rotation and small diameter provide valuable insights into its age and evolution.
Astronomers discovered five isolated 'blue blob' systems containing young, blue stars and little atomic hydrogen gas. The presence of mostly young stars and lack of gas suggests recent gas loss, contradicting expectations of older red stars.
A new technique has identified previously hidden protoclusters that could reveal new details about galaxy evolution. The ancestors of large galaxy clusters were found to be hiding in plain sight, with some protoclusters harboring unseen galaxies that evolved differently.
Researchers using ALMA have observed significant cold gas in the outer regions of A1689-zD1, a young, active star-forming galaxy. The findings suggest that early galaxies like A1689-zD1 may be larger and more complex than previously believed.
Researchers studied over 500 stars in a region of Andromeda called the Northeast shelf, finding conclusive evidence of an ancient collision. The findings provide insights into how material from collisions shapes a galaxy's appearance and makeup.
The Hubble Space Telescope has released the largest near-infrared image ever taken, allowing researchers to map star-forming regions and understand how the earliest galaxies originated. This high-resolution survey will enable the identification of rare objects such as massive galaxies, highly active black holes, and colliding galaxies.
Researchers have found that stars in distant galaxies are typically more massive than those in the Milky Way, changing our understanding of astronomical phenomena like black holes, supernovae, and galaxy death. This discovery may also explain why galaxies die and stop forming new stars.
Researchers have discovered a large sample of compact galaxies, including the rare 'Green Pea', 'Blueberry' and 'Purple Grape' types. These galaxies are found to have high star formation rates and low metallicity, providing new insights into galaxy formation and evolution.
Researchers have created the Thesan simulation, a cubic volume spanning 300 million light years across, to study cosmic reionization and galaxy formation. The simulation aligns with observations and sheds light on key processes, such as how far light can travel in the early universe.
Researchers from USTC discovered the acceleration of quasar outflows at tens of parsecs, exceeding traditional accretion disk wind model predictions. The findings suggest a key role for interstellar dust in facilitating this acceleration.
Researchers at Lund University mapped Ytterbium's origin to supernova explosions, revealing new opportunities for studying galaxy evolution. The study provides insight into the element's dual cosmic origins from heavy and regular stars.
Researchers found that the number of flat disk galaxies in our universe exceeds predictions from the Standard Model of Cosmology. The discrepancy suggests that dark matter may not be as prevalent as thought, forcing scientists to reevaluate their understanding of galaxy formation and evolution.
The study found a decline in star formation from low-ionization BAL to high-ionization BAL and a rebound of this process from HiBAL to non-BAL. The researchers proposed an evolutionary model to explain the results, suggesting that the outflow caused by AGNs has a global negative feedback on galaxy evolution.
Researchers have discovered a treasure trove of previously unknown globular clusters in the outer regions of Centaurus A, an elliptical galaxy. The study provides new insights into galaxy formation and the distribution of dark matter in the universe.
Three young stars have been discovered at the center of our galaxy, contradicting initial assumptions about a gas and dust cloud called G2. The unusual temperature of G2 has sparked debate among astronomers, but new observations reveal it is actually composed of three evolving young stars.
Researchers have found no dark matter in the ultra-diffuse dwarf galaxy AGC 114905, which can be explained by normal matter. The discovery confirms previous measurements and raises questions about the existence of dark matter in galaxies.
Using Arecibo's observations of nearby galaxies, researchers have found that the relationship between a galaxy's mass and rotation speed is not as straightforward as previously thought. The study provides a constraint for future researchers to develop theories on how galaxies evolve.
Astronomers at UT Austin's McDonald Observatory have discovered a massively dense black hole at the center of dwarf satellite galaxy Leo I, revealing an unprecedented mass ratio between the galaxy and its central black hole. This finding shakes up our understanding of galaxy evolution and dark matter distribution.
Astronomers have discovered two previously invisible galaxies 29 billion light-years away that were camouflaged by cosmic dust. The discovery suggests that up to one in five such distant galaxies may still be hiding behind the cosmic veil.
Researchers used NASA's Hubble Space Telescope to focus on a post-starburst galaxy nearly 500 million light years away. They discovered two periods of intense starburst before the galaxy stopped forming stars, shedding new light on its history and evolution.
Exposure to artificial light at night impairs crickets' activity cycles, disrupting their nocturnal chirping and potentially affecting reproduction. The study, conducted by researchers at Tel Aviv University and the Open University, highlights the need to reduce artificial light pollution to protect environmental behaviors.
Astronomers have discovered a massive galaxy protocluster, believed to be a 'galaxy shipyard', in the distant universe. The discovery provides insights into galaxy cluster formation and sheds light on the process of galaxies forming into clusters.
The AbacusSummit simulations are the largest-ever produced, clocking in at nearly 60 trillion particles. They will help scientists extract information about the universe from upcoming surveys of the cosmos.
A team of researchers observed the evolution of warm gas coming from an active black hole for unprecedented detail, revealing structures reminiscent of volcanic eruptions. These gas bubbles, rings, and 'intergalactic smoke' filaments are formed when black holes consume surrounding matter and release energy, influencing galaxy evolution.
A team of astronomers has observed six massive galaxies in the early universe that have mysteriously stopped forming stars due to depleted gas reserves. The discovery was made possible by the Hubble Space Telescope's high resolution and gravitational lensing, allowing researchers to study these galaxies in unprecedented detail.
An international team used the MUSE instrument to map a galactic wind and observe the formation of a nebula around a galaxy, revealing some of the Universe's missing baryons. This discovery confirms that 80–90% of normal matter is located outside of galaxies.
Physicist Eve Armstrong aims to understand the origins of elements heavier than iron using weather prediction technique data assimilation. With a two-year NSF EAGER grant, she and her team will predict whether supernova stardust gave rise to these heavy elements.
Researchers used simulations to detect extended dwarf galaxies with low surface brightness, challenging previous theories. The study found that these 'quenched' UDGs originated in backsplash orbits and are isolated from their parent systems.
Researchers used detailed simulations to detect and study 'quenched' UDGs, which are rare dwarf galaxies that have stopped generating stars. They found these galaxies were not in clusters but rather isolated in voids, with unique orbits that stripped away their star-forming gas.
A study by NYU Abu Dhabi researchers reveals the connection between central supermassive blackholes and the evolution of their host galaxies. The findings outline gas ejection mechanisms and how they relate to the activity of these blackholes, shedding new light on galaxy evolution.
Astronomers find that massive black holes play a key role in halting star formation in galaxies, contradicting previous assumptions. Using simulations and machine learning, the team confirmed that supermassive black hole mass is the most important factor in suppressing stellar activity.
Cosmic rays play a critical role in the final stages of supernovae explosions, allowing for a bigger impact on surrounding interstellar gas. The study suggests that these particles can give an extra push to the gas, increasing momentum by up to 4-6 times.
The STARFORGE simulation reveals that protostellar jets play a vital role in determining a star's mass, with jets disrupting the inflow of gas toward the star. This breakthrough helps researchers better understand star formation and its impact on galaxy evolution.
The NASA Hubble Fellowship Program has awarded fellowships to 24 postdoctoral scientists to pursue independent research in astrophysics. The selected researchers will focus on three broad scientific questions: How does the universe work?, How did we get here?, and Are we alone?
Researchers have made groundbreaking discoveries about the formation of galaxies and stars using data from the Atacama Cosmology Telescope. By analyzing microwave observations, they found that only a small percentage of gas in galaxies (about 10%) is turned into stars, shedding light on why galaxy formation remains inefficient.
A new study led by IAC researchers using the OSIRIS instrument on GRANTECAN has discovered the most densely populated galaxy cluster in formation in the primitive universe. The cluster, located 12.5 billion light years from us, is made up of galaxies with normal star formation rates and is predicted to evolve into a Virgo-like cluster.
Researchers developed COSMIC BIRTH to analyse large-scale cosmic structures, expressing observations as if detected in the early universe. The algorithm uses sampling techniques to deal with high-dimensional spaces, enabling the study of galaxy clusters and their formation.
Research reveals that galaxies with larger, 'puffy' disks continue to form stars over a longer period after cosmic noon. This is due to the cooler gas and lower influence of black holes, allowing for continued star formation. By studying galaxy disk size, astronomers can now accurately predict when star formation will cease.
A new study by Durham University and colleagues suggests that galaxy mergers could shut down star formation in the early universe, affecting galaxy growth. The researchers observed a massive galaxy, ID2299, which ejected half of its gas into the intergalactic medium due to the merger.
Researchers have discovered a massive globular cluster in the Andromeda Galaxy with an unusually low metallicity, challenging current theories on GC formation. The cluster's metallicity is nearly three times lower than previously known limits, suggesting that massive clusters could form from pristine gas in the early Universe.
Astronomers find galaxy Dragonfly 44 has normal amount of dark matter, contrary to earlier claims. The team discovered only 20 globular clusters, reducing the amount of dark matter, and confirming that the galaxy is not unique or anomalous.
Astronomers used machine learning to discover a rare galaxy with an oxygen abundance of 1.6% solar levels, setting a new record. The galaxy is thought to be in its early stages of formation, contradicting standard cosmology predictions.
Astronomers have created the most detailed evolutionary history of the Milky Way up to now, combining apparent luminosity with measured distance and accurate star models. The study reveals well-defined periods of great activity in star formation, including dramatic episodes that stimulated new star creation.
Astronomers used ALMA to discover a massive rotating disk galaxy, DLA0817g, which challenges traditional models of galaxy formation. The galaxy formed primarily through the steady accretion of cold gas, indicating alternative growth processes dominated over violent mergers.
A new cosmological simulation, TNG50, has revealed that the geometry of cosmic gas flows determines galaxies' structures. The study finds that galaxies form into disc-like shapes with rapid rotation, eventually becoming spiral galaxies through a process known as galactic fountains.