Latest Galaxy formation and evolution Stories

XMM-Newton Measures The Power Of Black-hole Driven Outflows
2012-02-28 05:01:35

A curious correlation between the mass of a galaxy's central black hole and the velocity of stars in a vast, roughly spherical structure known as its bulge has puzzled astronomers for years. An international team led by Francesco Tombesi at NASA's Goddard Space Flight Center in Greenbelt, Md., now has identified a new type of black-hole-driven outflow that appears to be both powerful enough and common enough to explain this link. Most big galaxies contain a central black hole weighing...

2012-02-18 01:41:16

ALMA and Jansky VLA enabling forefront research at frontiers of astrophysics Two new and powerful research tools are helping astronomers gain key insights needed to transform our understanding of important processes across the breadth of astrophysics. The Atacama Large Millimeter/submillimeter Array (ALMA), and the newly-expanded Karl G. Jansky Very Large Array (VLA) offer scientists vastly improved and unprecedented capabilities for frontier research. The cutting-edge research enabled...

Black Hole Found At The Center Of A Shredded Galaxy
2012-02-15 13:40:43

Astronomers say they have found a black hole that was once at the core of a now-disintegrated dwarf galaxy. The researchers used NASA's Hubble Space Telescope to find a cluster of young, blue stars encircling the first intermediate-mass black hole ever discovered. "For the first time, we have evidence on the environment, and thus the origin, of this middle-weight black hole," Mathieu Servility, who worked at the Harvard-Smithsonian Center for Astrophysics when this research was...

Cluster Of Stars Survived Massacre 13 Billion Years Ago
2012-02-14 13:37:27

Astronomers have found a cluster of stars that they say survived a massacre 13 billion years ago. The team used computer simulations to look at how the compact groups of stars surrounding our Milky Way galaxy were formed. There are about 200 compact groups sitting close to our galaxy, each containing up to a million stars. The researchers ran simulations of isolated and colliding galaxies, in which they included a model for formation and destruction of stellar clusters. Once a...

What Color Is The Milky Way?
2012-01-12 11:04:45

Astronomers from University of Pittsburgh seeking to find the true color of our very own Milky Way have revealed that it is so white that it would resemble a fresh blanket of snow to the naked eye. The astronomers said the color of the galaxy is important because it reveals age, ranging from young blue galaxies with new stars still being born, to older red ones that rarely form new stars. It seems we are right in the middle of this range. The Pittsburgh University team wanted to find...

Rare Ultra-Blue Stars Among Hubble Andromeda Finds
2012-01-12 05:49:30

[ Watch the Video ] Images taken by the Hubble Space Telescope have revealed both a cluster of rare ultra-blue stars and a "double nucleus" of old, reddish stars orbiting a 100-million-solar-mass black hole at the nearby Andromeda spiral galaxy, NASA officials announced on Wednesday. The discoveries, detailed by the U.S. space agency in separate press releases, were also presented Wednesday at the American Astronomical Society (AAS) meeting in Austin, Texas. A paper detailing the Hubble...

Early Black Holes Grew Big Eating Cold, Fast Food
2011-12-13 04:19:10

Largest Cosmological Simulation To-Date Explains How Supermassive Black Holes Came Into Existence Shortly After the Big Bang Researchers at Carnegie Mellon University´s Bruce and Astrid McWilliams Center for Cosmology have discovered what caused the rapid growth of early supermassive black holes — a steady diet of cold, fast food. Computer simulations, completed using supercomputers at the National Institute for Computational Sciences and the Pittsburgh Supercomputing Center...

Image 1 - Monster Galaxies Found To Harbor Record Massive Black Holes
2011-12-06 10:40:02

Astronomers from UC Berkeley have discovered the largest black holes to date -- two monstrous abyssal voids with masses equivalent to more than 10 billion suns, threatening to consume everything in its path within a region five times the size of our own solar system. The massive black holes are at the centers of two galaxies more than 300 million light years away. Such holes could be the gravitational foundations of galaxies and clues to the fates of violent quasars, the powerful...

Astronomers Find Clouds Of Primordial Gas From The Early Universe
2011-11-11 04:10:18

For the first time, astronomers have found pristine clouds of the primordial gas that formed in the first few minutes after the Big Bang. The composition of the gas matches theoretical predictions, providing direct evidence in support of the modern cosmological explanation for the origins of elements in the universe. Only the lightest elements, mostly hydrogen and helium, were created in the Big Bang. Then a few hundred million years passed before clumps of this primordial gas condensed to...

Latest Galaxy formation and evolution Reference Libraries

2010-09-13 16:56:08

The Coma Cluster (Abell 1656), along with the Leo Cluster, is one of two major clusters compromising the Coma Supercluster. It contains over 1000 identified galaxies. Most of the galaxies in the center of the Coma Cluster are elliptical galaxies including both dwarf and giant. However the center is dominated by NGC 4874 and NGC 4889, two giant elliptical galaxies. The brightest galaxies are visible, a few degrees north of the galactic pole, with an amateur telescope larger than 20 cm. The...

2010-09-07 17:03:18

The Abell 520 galaxy cluster is an strange structure formed by a major merger. Due to its odd and chaotic nature it has been given the nick-name the Train Wreck Cluster. The Dark Matter within the cluster does not act as expected like it does in other clusters, therefore, Abell 520 creates problems for many of the prevailing theories about Dark Matter. It also disrupts many alternative theories of modified gravity. Similar to the Bullet Cluster the gas contents and galaxies within the...

2004-10-19 04:45:42

Ring Galaxy -- A subclass of interacting galaxies, ring galaxies, provides a unique laboratory for studying unusually large bursts of non-nuclear star formation. The rings in these systems are often large (10s of kiloparsecs) and contain what appear to be associations of giant H{\small II} regions. As a basis for future modeling of star forming regions in observed ring galaxies we present a series of combined n-body/gas numerical experiments on ring formation and evolution. Three...

2004-10-19 04:45:41

Molecular Cloud -- Molecular clouds are interstellar nebulae that have a density and size sufficient to permit the formation of H2, molecular hydrogen. However, this molecule is difficult to detect, and the molecule most used to trace the H2 is CO (carbon monoxide). The ratio between CO luminosity and H2 mass is roughly constant, although there are reasons to doubt this assumption in observations of some other galaxies. In the Milky Way, molecular clouds account for roughly one-half...

2004-10-19 04:45:41

Globular Cluster -- A globular cluster is a cluster of stars that is spherical in shape and extremely dense towards its core. Globular clusters are usually composed of hundreds of thousands of old stars, similar to the bulge of a spiral galaxy but confined to a volume of only a few cubic parsecs. Some globular clusters (like Omega Centauri in our Milky Way, and G1 in M31) are truly massive clusters, with several million times the mass of our Sun. Such globular clusters may be the...

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