Articles tagged with Dwarf Galaxies
Astronomers have discovered a black hole weighing 50,000 times the mass of our Sun, offering the strongest evidence yet for intermediate-mass black holes in the universe. Hubble's observations confirmed that the object was tearing apart a star that passed too close, providing key evidence for its existence.
The Sombrero galaxy's halo is home to an unexpected abundance of metal-rich stars, defying conventional theory. Researchers attribute this finding to major mergers in the galaxy's past, which are puzzling given the galaxy's smooth disk structure.
Laura Sales, an assistant professor at UC Riverside, has received a $720,000 NSF CAREER Award to study dark matter content in dwarf galaxies. Her research aims to refine the Lambda Cold Dark Matter model and address questions about galaxy formation and evolution.
Researchers found over a dozen massive black holes in dwarf galaxies that were previously thought too small to host them. The study revealed that most black holes were located at the outskirts of galaxies rather than centers.
A team of researchers used a single star affected by the Milky Way-Gaia-Enceladus collision to determine its age and date the event to approximately 11.5 billion years ago. The study provides insights into the impact of galaxy collisions on their evolution.
The James Webb Space Telescope will study dwarf galaxy companions to the Milky Way and Andromeda, gaining insights into galaxy formation and dark matter. By measuring star motions, researchers hope to determine if some galaxies are grouped in a flat plane, which would have significant implications for understanding their formation.
The HERON collaboration completes the largest survey of nearby galaxy haloes, finding that diameter correlates with galaxy brightness; vast haloes found in bright galaxies, also seen in smaller discs. The team's low-cost system reveals faint stars tracing dark matter structures, offering new insights into galaxy evolution.
Researchers have successfully used a massive galaxy cluster as an X-ray magnifying glass to detect a tiny dwarf galaxy in its first, high-energy stages of star formation. The technique allows for the zooming in on extreme, distant X-ray-emitting phenomena and could be used to age-date different parts of a galaxy.
Researchers at UC Riverside discover large-scale winds associated with active black holes in small galaxies suppress star formation, impacting galaxy evolution. The team used the Sloan Digital Sky Survey data to identify 50 dwarf galaxies and found six of them showing signs of winds emanating from their active black holes.
A new Yale University study reveals that supermassive black holes grow in tandem with their host galaxies, influenced by the rate of star formation. The research provides a sharper understanding of the intricate relationship between these cosmic entities.
A study led by the Instituto de Astrofísica de Canarias reveals the early days of the Milky Way's formation, identifying two distinct stellar components that merged to create our galaxy. The research uses accurate stellar ages and Gaia space telescope data to uncover the birth of the Milky Way with unprecedented detail.
Researchers have localized a fast radio burst, FRB 190523, to a galaxy 7.9 billion light-years away, providing new clues in the ongoing cosmic mystery. The discovery suggests that every galaxy, including our Milky Way, can generate an FRB.
Researchers have localized a non-repeating fast radio burst (FRB) to a medium-sized galaxy over 4 billion light years away. The findings show that the burst source and host galaxy are distinct from those of the only other localized FRB, offering insights into the properties of these enigmatic events.
Researchers used reverberation mapping to determine the mass of NGC 4395's black hole, finding it to be about 10,000 times the mass of our sun. This is the smallest black hole found via this technique and provides new insights into dwarf galaxies and their nuclear black holes.
Researchers found a star in the Milky Way Galaxy with low magnesium levels and high Europium levels, indicating it formed elsewhere, likely in a now vanished dwarf galaxy. The discovery suggests galaxy evolution models are supported by the presence of similar chemical signatures in other stars from dwarf galaxies orbiting the Milky Way.
A team of scientists discovered a star with unusually low magnesium and excessive heavy elements, indicating it originated from a disrupted dwarf galaxy. The study provides insight into the chemical evolution of dwarf galaxies and their role in shaping the Milky Way.
Researchers propose dark matter scatters with each other like billiard balls to spread out evenly in small galaxies. This idea could solve the puzzle of why dark matter doesn't clump together as expected in bigger systems.
Scientists have discovered that dark matter can be heated up and pushed outwards due to star formation in galaxies. This phenomenon, known as 'dark matter heating', has been observed in 16 dwarf galaxies with varying star formation histories.
A team of astronomers has identified a giant disrupted 'tadpole' galaxy 300 million light years away, with an elliptical head and a long straight tail. The galaxy is ten times larger than the Milky Way and contains a system of two close disc galaxies.
Researchers have identified a giant, exceptional relic of a disrupted galaxy, comprising an elliptical head and a long tail. The 'tadpole' galaxy is 1 million light-years long from end to end and contains two nearby galaxies within it.
The Laser Interferometer Space Antenna (LISA) will enable astrophysicists to study gravitational waves emitted by black holes, which could unveil secrets about dark matter. Simulations suggest a connection between black hole merger rates and dark matter properties.
The Gaia satellite has detected substructures in the Milky Way's star disk, indicating a 300-million-year-old gravitational disturbance caused by the Sagittarius Dwarf galaxy. Researchers used precise data to analyze shapes and twisting patterns, leading to new findings on galactic archaeology
Researchers found a massive black hole with a mass of 3.5 million solar masses in the center of Fornax UCD3, a rare and densely packed galaxy. This discovery supports the tidal origin hypothesis for the formation of ultracompact dwarfs.
The Gaia Sausage refers to an ancient head-on collision between the Milky Way and a smaller dwarf galaxy, dubbed the Sausage galaxy. The impact, which occurred around 8-10 billion years ago, reshaped the galaxy's structure, forming its inner bulge and outer halo.
Researchers use computer simulations to test dark matter's presence in satellite galaxies, finding a relationship that could clarify its existence. The study uses radial acceleration relation data from the Gaia spacecraft to make predictions about the behavior of dwarf galaxies.
Researchers from the University of Surrey have developed a new method to measure dark matter at the centre of tiny galaxies. The study used dense star clusters orbiting close to the centre of dwarf galaxies to calculate the inner dark matter density, finding less dark matter in some cases than predicted by models.
A team of astronomers discovered that some stars in the Galactic halo are former residents of the Galactic disk, kicked out by invading dwarf galaxies. This finding confirms a new understanding of the Milky Way's history and future, revealing a complex interplay between galaxy interactions.
Researchers found that 14 out of 16 satellite galaxies of Centaurus A orbit in a single plane and rotate coherently. This synchronized movement contradicts standard cosmology simulations, suggesting flaws in current theories of galaxy formation.
Researchers found supermassive black holes prevent star formation in smaller galaxies by driving powerful winds that heat gas, quenching the process. This discovery sheds light on how dwarf galaxies, composed of up to 100 million stars, evolve and affects our understanding of galaxy evolution.
Astronomers used Hubble and Gaia data to directly measure the 3D motions of stars in the Sculptor Dwarf Galaxy, achieving accuracy better than previous measurements. The results provide insights into dark matter distribution and test the cosmological model.
A newly discovered dwarf galaxy in the constellation Lynx has extremely low oxygen levels, likely resembling early nascent galaxies. The finding suggests that these tiny star-forming galaxies can offer valuable insights into how the first galaxies formed 13 billion years ago.
Researchers from University of California, Irvine estimate tens of millions of stellar-remnant black holes exist in the Milky Way galaxy. The number of black holes is expected to depend on the size of the galaxy.
A team of astronomers has discovered a superluminous supernova in a spiral galaxy, which is rich in elements heavier than hydrogen and helium. This discovery challenges current ideas about the origin of such powerful explosions.
Astronomers detected a rare superluminous supernova, one of the brightest ever seen, in a distant galaxy 10 billion light years away. The explosion occurred during the cosmic high noon period, when star formation peaked 3.5 billion years after the Big Bang.
A team of astronomers discovered a rare superluminous supernova in a distant galaxy 10 billion years ago. The brilliant explosion, one of the brightest ever recorded, occurred at cosmic high noon when the rate of star formation was at its peak.
Astronomers have spotted a rare opportunity to study the demise of a dwarf galaxy called Little Cub, which is being consumed by a gigantic neighbouring galaxy. The process provides clues about how smaller galaxies lose their gas and eventually shut down star formation.
A new RIT study confirms the coexistence of satellite galaxies and dark matter, shedding light on a long-standing debate. The research supports the current cosmological paradigm by showing that the vast polar structure of dwarf galaxies is an unstable feature that formed later in the galaxy's evolution.
Scientists have identified a brown dwarf with a composition of over 99.99% hydrogen and helium, making it the most massive known to date. The discovery sheds light on the possibility of an undiscovered population of extremely pure brown dwarfs in our galaxy's ancient past.
Astronomers have discovered a rare Hoag-type galaxy with two circular rings, providing unique insights into galaxy formation and evolution. The galaxy's inner ring is older than its outer ring, suggesting different formation histories for the two components.
A team of researchers has localized the source of a Fast Radio Burst (FRB) to an older dwarf galaxy over 3 billion light years away. The galaxy is believed to harbor a supermassive black hole and may be connected to other energetic events such as supernovae and gamma-ray bursts.
Researchers have pinpointed the location in the sky of a Fast Radio Burst (FRB), allowing them to determine the distance and home galaxy of one of these mysterious pulses of radio waves. The precise location enables observations using multiple telescopes, which revealed a faint dwarf galaxy at the location of the bursts.
Researchers from the Niels Bohr Institute have recreated characteristics of ultra-diffuse faint galaxies using computer simulations. The study reveals that supernovae explosions during star formation can push stars and dark matter outwards, causing galaxies to expand and become faint.
Astronomers have found an extremely faint dwarf satellite galaxy, Virgo I, located 280,000 light years from the Sun. The discovery suggests hundreds of yet-undetected dwarf satellites in the halo of the Milky Way.
Astronomers have discovered a large population of distant dwarf galaxies that could reveal details about star formation in the early universe. These galaxies are 10 to 100 times fainter than previously observed galaxies, but produce more than half of the ultraviolet light during this era.
Theoretical modeling work resolves debates on dwarf galaxy formation by accurately predicting their properties. The new simulation brings theoretical predictions into better agreement with observations of dwarf galaxies surrounding the Milky Way.
Researchers used colors to identify the ages of over 130,000 stars in the Milky Way's halo, revealing a clear hierarchy with oldest stars at the center and younger ones further away. The study supports a hierarchical model of galaxy formation, suggesting that small mini-halos merged to form the Milky Way.
Astronomers discovered a tiny, ancient galaxy that contains seven stars with heavy elements formed through rapid neutron captures, a process more common in rare cosmic collisions. The findings suggest that the heaviest elements on Earth originated in neutron star mergers.
A new method of galactoseismology has confirmed the existence of a dark-matter dominated dwarf galaxy and may help locate satellite galaxies. The method uses waves in the galactic disk to map the interior structure and mass of galaxies, offering a fresh perspective on understanding dark matter.
Astronomer Evan Kirby measures high concentration of dark matter in small dwarf galaxy Triangulum II, potentially making it a leading candidate for direct detection. The galaxy's unique characteristics and minimal background noise make it an ideal location to search for gamma-ray signals from colliding dark matter particles.
A new survey using Japan's Suzaku X-ray satellite reveals that the elements necessary for stars, planets, and people were evenly distributed across the Virgo galaxy cluster at a scale of millions of light-years. This discovery suggests that the chemical makeup of the universe is well mixed, with little variation on the largest scales.
The discovery of over 250 dwarf galaxies at z=6-8 provides strong evidence that faint dwarf galaxies were responsible for cosmic reionization. The team's analysis determined that the smallest and most abundant galaxies in the study were vital to the process.
A newly discovered dwarf galaxy is radiating high-energy gamma rays, potentially pointing to the presence of dark matter. The detection was made using publicly available data from NASA's Fermi Gamma-ray Space Telescope and has sparked excitement in the scientific community.
Chakrabarti's new study will create a simulated map of satellite populations from analyzing extended atomic hydrogen disks, which may answer the
Researchers have found conclusive evidence of a black hole in Henize 2-10, a small, starburst galaxy. The team analyzed X-ray observations from four space telescopes over 13 years, confirming the presence of a supermassive black hole with a mass one million times that of the sun.
Researchers found two ancient stars in Sculptor dwarf galaxy with unusual chemical content, suggesting a single supernova explosion may have seeded the gas cloud. This discovery provides an unprecedented view of the earliest history of another galaxy.
New research by Rensselaer Polytechnic Institute reveals that the Milky Way's galactic disk is contoured into several concentric ripples, extending its known width from 100,000 to 150,000 light years.
Researchers have found a set of celestial objects that resemble dwarf satellite galaxies orbiting the Milky Way. These discoveries could provide insights into dark matter and its role in galaxy formation.
Astronomers validate earlier prediction of dark-matter dominated dwarf galaxy's location by discovering young Cepheid variables in the Norma constellation. The discovery sheds light on the nature of dark matter and confirms Newton's theory of gravity.
Researchers analyzing decades of observations detect an unusual source of light in a galaxy, with properties suggesting it could be a supermassive black hole ejected from its home galaxy. Alternatively, the object might have been a rare type of star known as a Luminous Blue Variable that underwent prolonged eruptions.
Astronomers discovered that nearby dwarf spheroidal galaxies lack star-forming gas, while those beyond a certain distance have abundant hydrogen. The Milky Way's gravity affects the composition of its smallest neighbors, shutting down star formation.