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Latest Galaxy formation and evolution Stories

28ed0525ee8cb5656900e60d914aecff
2010-03-04 09:15:32

Located half a billion light-years from Earth, ESO 306-17, is a large, bright elliptical galaxy in the southern sky of a type known as a fossil group. Astronomers use this term to emphasize the isolated nature of these galaxies. However, are they like fossils "” the last remnants of a once active community "” or is it more sinister than that? Did ESO 306-17 gobble up its next-door neighbors? Gravity brings galaxies together and bigger ones swallow smaller ones. There is evidence...

09ac26f7a20b5e41bd6c8fe1e5201080
2010-03-01 13:30:00

A team of astronomers using NASA's Hubble Space Telescope and other space instruments has discovered that a collection of small, ancient galaxies, called the Hickson Compact Group 31 (HCG 31), finally is coming together into one larger galaxy after 10 billion years. The images the team recorded offer a window into the universe's early years, when the buildup of large galaxies from smaller building blocks was common. According to Jane Charlton, a Penn State professor of astronomy and...

7253725815a0231e7e6a00ddce919c791
2010-02-25 12:30:00

Lowell Observatory astronomer Deidre Hunter and her team studies small, diffuse galaxies to learn about star formation in those regions and, perhaps, shed light on the birth of the first stars after the Big Bang When you picture a galaxy in your mind's eye, it's often a spiral with magnificent structure--long, swirling, milky-white arms of stars and gas. Lowell Observatory astronomer Deidre Hunter has spent most of the last 17 years methodically studying galaxies that you might not...

f6f3852527c134689476f5b133e9a8e61
2010-02-23 09:55:00

Around a quarter of the globular star clusters in our Milky Way galaxy are invaders from other galaxies, according to a team of scientists from Swinburne University of Technology in Australia. In a paper accepted for publication in Monthly Notices of the Royal Astronomical Society, Swinburne astronomer Professor Duncan Forbes has shown that many of our galaxy's globular star clusters are actually foreigners - having been born elsewhere and then migrated to our Milky Way.  "It turns out...

2010-02-17 11:00:00

WASHINGTON, Feb. 17 /PRNewswire-USNewswire/ -- A diverse cast of cosmic characters is showcased in the first survey images NASA released Wednesday from its Wide-field Infrared Survey Explorer, or WISE. (Logo: http://www.newscom.com/cgi-bin/prnh/20081007/38461LOGO) Since WISE began its scan of the entire sky in infrared light on Jan. 14, the space telescope has beamed back more than a quarter of a million raw, infrared images. Four new, processed pictures illustrate a sampling of the...

da940da2cd2a0edb46b7baa0963e7f151
2010-02-17 08:20:00

After years of successful concealment, the most primitive stars outside our Milky Way galaxy have finally been unmasked. New observations using ESO's Very Large Telescope have been used to solve an important astrophysical puzzle concerning the oldest stars in our galactic neighborhood "” which is crucial for our understanding of the earliest stars in the Universe. "We have, in effect, found a flaw in the forensic methods used until now," says Else Starkenburg, lead author of the paper...

dc55535d400c2a540f986c9835d018ab1
2010-02-16 09:30:00

University of Arizona astronomers have helped solve a mystery surrounding the birth of stars in galaxies that has long puzzled scientists. Their results are published in the Feb. 11 issue of Nature. "We have known for more than a decade that in the early universe "“ three to five billion years after the Big Bang or nine to eleven billion years before today "“ galaxies churned out new stars at a much faster rate than they do now," said Michael Cooper, a postdoctoral Spitzer fellow...

c8813adee1e6d0edfab77b2a6605cb001
2010-01-05 13:15:00

More than 12 billion years of cosmic history are shown in this unprecedented, panoramic, full-color view of thousands of galaxies in various stages of assembly. This image, taken by NASA's Hubble Space Telescope, was made from mosaics taken in September and October 2009 with the newly installed Wide Field Camera 3 (WFC3) and in 2004 with the Advanced Camera for Surveys (ACS). The view covers a portion of the southern field of a large galaxy census called the Great Observatories Origins Deep...

53e8a296a327f6ab1293d5c4ab476ef11
2010-01-04 15:15:00

Astronomers are announcing today that they have discovered 33 pairs of waltzing black holes in distant galaxies. This result was presented by Dr. Julia Comerford of the University of California, Berkeley in Berkeley, California to the American Astronomical Society meeting in Washington, DC. This result is particularly important because it shows that supermassive black hole pairs are more common than previously known from observations, and because the black hole pairs can be used to estimate...

37c3b9c62be0a889efcd3d86f730c1fa1
2009-11-25 13:37:38

Astronomers on behalf of Galaxy Zoo have unveiled a new game aimed at letting players help them understand how galaxies have formed. The game involves images taken by a camera attached to a telescope in the Sloan Digital Sky Survey. Game participants are asked to match simulations of colliding galaxies, called galactic mergers. Astronomers say the human brain is much more reliable than even the fastest computer at classifying the shapes of colliding galaxies. The project is led by scientists...


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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Word of the Day
omphalos
  • The navel or umbilicus.
  • In Greek archaeology: A central boss, as on a shield, a bowl, etc.
  • A sacred stone in the temple of Apollo at Delphi, believed by the Greeks to mark the 'navel' or exact center-point of the earth.
'Omphalos' comes from the ancient Greek.
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