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Latest Galaxy formation and evolution Stories

dwarf galaxy NGC 4395
2014-03-27 04:42:05

redOrbit Staff & Wire Reports - Your Universe Online While experts might not know exactly how supermassive black holes grow to sizes up to a billion times that of our sun, astronomers using NASA’s Wide-field Infrared Survey Explorer (WISE) believe they have discovered the so-called cosmic seeds that will ultimately become gravity-rich regions from which light cannot escape. Black holes come in various sizes, with the smallest ones only a few times greater in mass than our sun and...

Collage of galaxies in the Herschel Reference Survey
2014-03-18 19:58:57

ESA The largest census of dust in local galaxies has been completed using data from ESA’s Herschel space observatory, providing a huge legacy to the scientific community. Cosmic dust grains are a minor but fundamental ingredient in the recipe of gas and dust for creating stars and planets. But despite its importance, there is an incomplete picture of the dust properties in galaxies beyond our own Milky Way. Key questions include how the dust varies with the type of galaxy, and how...

Spiral Galaxy M81 is an example of a fat bulgy galaxy
2014-02-28 11:19:26

Brett Smith for redOrbit.com - Your Universe Online A pair of Australian astrophysicists has shown that the shape of a galaxy is determined by how fast it spins, according to a new report in The Astrophysical Journal. Part of “The Evolving Universe” research series at the ARC Centre of Excellence for All-sky Astrophysics (CAASTRO) in Australia, the new study concluded that fatter spiral galaxies are relatively slow spinning, while thinner spiral galaxies are rotating are higher...

Red Dead Redemption: Black Holes Bully Galaxies Into Submission
2014-02-26 15:13:15

Brett Smith for redOrbit.com - Your Universe Online Typically filled with only the oldest stars, which are relatively low in mass and appear red, giant elliptical galaxies have long baffled astronomers. These galaxies are mysteriously shut down with respect to star-forming activity – a status scientists refer to as “red and dead.” These galaxies are thought to be low on cold gas, an important raw material for star forming, but a new study in the Monthly Notices of the Royal...

Andromeda galaxy
2014-02-24 04:27:39

redOrbit Staff & Wire Reports - Your Universe Online An international team of astronomers studying the satellite galaxies surrounding Andromeda has for the first time observed the remnant of a merger between two low-mass dwarf galaxies, according to new research published online Sunday in the journal Nature. The study authors, who hail from the Niels Bohr Institute at the University of Copenhagen, the University of Cambridge’s Institute of Astronomy and the Max Planck Institute...

Distant Galaxy Clusters Located By ESA Spacecraft
2014-02-12 13:04:23

Brett Smith for redOrbit.com - Your Universe Online Using a novel way of combining data from the two European Space Agency (ESA) satellites Planck and Herschel, an international team of scientists has been able to locate more distant galaxy clusters than previously possible. According to the team’s report in the Monthly Notices of the Royal Astronomical Society, they were able to use their new technique to discover four previously unknown galaxy clusters containing thousands of...

Early Galaxies Formed By Collisions
2014-01-29 14:23:23

Lee Rannals for redOrbit.com - Your Universe Online Astronomers writing in the Astrophysical Journal say that massive galaxies in the early universe were formed through collisions. Scientists studied galaxies that existed when the universe was just between 1 and 2 billion years old. The smallest of these galaxies contain a few million stars, while the largest can contain several hundred billion stars. The first stars in the universe showed up about 200 million years after the Big...

Active Supermassive Black Holes Discovered In Two Merging Galaxies
2014-01-28 13:17:31

[ Watch the Video: Galaxy Mergers And Supermassive Black Holes ] Lee Rannals for redOrbit.com - Your Universe Online Astronomers publishing a paper in the Astrophysical Journal say they have found two merging galaxies have active supermassive black holes. The team conducted infrared observations of the merging galaxies by using the Subaru Telescope. They found that at least one of the supermassive black holes almost always becomes active and luminous by accreting a large amount of...

Astronomer Discovers Hydrogen River Flowing Into Nearby Galaxy
2014-01-28 09:52:49

April Flowers for redOrbit.com - Your Universe Online What might be a never-before-seen river of hydrogen flowing through space has been discovered by West Virginia University astronomer, D.J. Pisano, using the National Science Foundation's (NSF) Robert C. Byrd Green Bank Telescope (GBT). A study, published in the Astronomical Journal, reveals that this river is a faint, very tenuous filament of gas, which is streaming into the nearby galaxy, NGC 6946. Understanding this may help...

FIRE Project Explains Galactic Masses
2014-01-23 09:00:42

April Flowers for redOrbit.com - Your Universe Online A puzzling contradiction has challenged astrophysicists for decades: many galactic wind models—which are simulations of how matter is distributed in the universe—predict that most of the "normal" matter exists in stars at the center of galaxies. However, these stars actually only account for less than 10 percent of the matter in the universe. Now, new simulations have revealed insight into this mismatch between models and reality,...


Latest Galaxy formation and evolution Reference Libraries

45_03c916cf051c1a581c0d52b3ccdd7561
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...

45_274ba7ddcce89663fc213d79e864e44b
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...

6_11b0e50afd172f6a61aeda24e25504702
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...

6_53083d96ff77dbf99c47ef10b6a209332
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...

6_46f1290db7aabf07d0480393fea260ed2
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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