Latest Galaxy formation and evolution Stories

Neighboring Satellite Dwarf Galaxies Do Not Fit The Standard Model
2014-06-11 07:37:40

Lawrence LeBlond for redOrbit.com - Your Universe Online An international team of scientists have found that dwarf satellite galaxies that orbit the Milky Way and neighboring Andromeda galaxy defy the standard model of galaxy formation. As well, recent attempts to fit them into the model have been flawed, raising questions about the accuracy of the standard model of cosmology, which has been the long accepted concept for the origin and evolution of the universe. In a paper to be...

Smith Cloud Survives Galactic Collision Thanks To Full Dark-matter Facket
2014-05-23 03:44:33

National Radio Astronomy Observatory Like a bullet wrapped in a full metal jacket, a high-velocity hydrogen cloud hurtling toward the Milky Way appears to be encased in a shell of dark matter, according to a new analysis of data from the National Science Foundation's Robert C. Byrd Green Bank Telescope (GBT). Astronomers believe that without this protective shell, the high-velocity cloud (HVC) known as the Smith Cloud would have disintegrated long ago when it first collided with the disk...

Illustris simulation
2014-05-08 05:17:50

redOrbit Staff & Wire Reports - Your Universe Online Researchers at MIT and Harvard have devised the most accurate model to date of how our universe first took shape. Dubbed Illustris, the new virtual cosmos covers the 13 billion-year evolution of the universe beginning just 12 million years after the Big Bang. It includes details never before achieved in a simulation, and accurately portrays the distribution and composition of numerous types of galaxies. "Until now, no single...

Magellan Telescopes at Las Campanas Observatory
2014-05-02 04:46:11

John P. Millis, Ph.D. for redOrbit.com - Your Universe Online In the normal course of evolution, galaxies initially formed stars as clouds of hydrogen and helium collapsed. Eventually the density and temperature of the cores would ignite nuclear fusion, allowing them to shine during what we call the main sequence phase of their lives. Eventually, stars will fuse heavier and heavier elements, with stars like our sun eventually culminating as balls of carbon and oxygen – in varying...

Astronomers Discover Mature Galaxies In A Young Universe
2014-04-30 04:33:59

redOrbit Staff & Wire Reports - Your Universe Online With the assistance of the European Space Agency’s (ESA) Herschel Space Observatory, astronomers have located a young galaxy rotating in a calmer, more mature manner similar to more developed ones like the Milky Way. The galaxy, which has been dubbed S0901, has apparently completed the accumulation of its gas reservoir, the ESA explained in a statement Tuesday. When galaxies form, they build mass by gravitationally attracting...

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...

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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Word of the Day
  • A small crescent-shaped structure or marking, especially the white area at the base of a fingernail that resembles a half-moon.
This word is a diminutive of the Latin 'luna,' moon.