Articles tagged with Galaxy Formation
The RAVE survey has released its first dataset, containing information from 25,000 stars born when the Milky Way was in its infancy. The data will allow astronomers to test ideas of the galaxy's origins laid out by various cosmological theories.
Astronomers detect a vast hot halo extending over 60,000 light years around the massive spiral galaxy NGC 5746. This discovery resolves a long-standing issue in galaxy formation theory, suggesting that large spiral galaxies should be immersed in halos of hot gas left over from the galaxy formation process.
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.
A team of astronomers has discovered a large population of galaxies formed between 9 and 12 billion years ago, contradicting previous estimates that the Universe had not yet formed many stars in the first billion years. The findings suggest that stars formed two to three times faster than previously thought.
The Millennium Simulation uses sophisticated modeling techniques to recreate evolutionary histories for 20 million galaxies and supermassive black holes. The simulation demonstrates that a few massive black holes can form early enough to account for rare quasars, and provides a new tool for understanding the nature of dark energy.
The Millennium Run simulation recreated evolutionary histories for 20 million galaxies and supermassive black holes, clarifying physical processes underlying galaxy buildup. The study also demonstrated that characteristic patterns imprinted on matter distribution at early epochs are still present in observed galaxy distributions.
Simulations show that growing black holes release a blast of energy, powering strong winds that prevent material from falling in, inhibiting further growth. This process links black hole mass to the total mass of stars in galaxies, explaining observed phenomena and promising deeper insights into galaxy formation.
CU researchers report consistent pattern in deuterium abundance, suggesting smaller amount of chemical evolution and higher infall of near primordial gas to the Milky Way galaxy. The findings provide a better understanding of galactic chemical evolution and its impact on the formation of stars, planets, and life.
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.
The Gemini Deep Deep Survey reveals that a large fraction of stars in the Universe are already in place when the Universe was young, contradicting existing models. The survey provides a comprehensive sample of galaxies in the Redshift Desert, revealing more metal-rich galaxies than expected.
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.
Scientists discovered a tiny dwarf galaxy in intergalactic space that was previously overlooked. The galaxy is believed to have formed elements through supernova explosions, enriching the gas cloud. This finding suggests that tiny galaxies may have played a significant role in the chemical evolution of the universe.
Astronomers have discovered intriguing patterns of star motion and composition that suggest a remnant of a smaller galaxy consumed by the Milky Way billions of years ago. The study, part of the 2dF Old Stellar Population Survey, aims to investigate the galactic merger that formed the Milky Way's thick disk.
Astronomers have discovered bluer galaxies in nearby clusters, indicating recent star formation and a possible ongoing process. The finding revises the Butcher-Oemler effect, suggesting that some clusters may still be forming new stars.