Quantcast

Latest Accretion disc Stories

2014-03-05 12:21:30

WASHINGTON, March 5, 2014 /PRNewswire-USNewswire/ -- Astronomers have used NASA's Chandra X-ray Observatory and the European Space Agency's (ESA's) XMM-Newton to show a supermassive black hole

Be Star Black Hole
2014-01-17 08:27:04

The black hole in question is orbiting an object known as a Be-type star, which is unusual because of its incredibly high rate of rotation.

Cosmic Turbulence Black Hole Formation
2013-08-16 09:31:01

The mechanism by which stars and black holes are formed in extreme cases of high mass density has puzzled astronomers since Johannes Kepler first laid out his laws of planetary motion some 400 years ago.

Unraveling Galactic History Begins With A Black Hole's Spin
2013-07-30 14:11:38

A supermassive black hole is believed to sit at the center of each large galaxy and a new technique designed to detect the dark abyss's spin could be the key to unraveling a galaxy's history.

NASA X-Ray Observatories Reveal Black Hole Spin
2013-02-27 17:22:50

Scientists affiliated with NASA’s NuSTAR and XMM-Newton X-ray observatories have now devised a clever way to directly measure the rotation of nearby supermassive black holes.

Using Black Hole Disks And Jets To Explore The Limits Of Spacetime
2013-02-22 10:37:51

Black holes are voracious monsters at the center of galaxies that shape the growth and death of the stars around them with their tremendous gravitational pull and explosive ejections of energy. Now, researchers are using them as a tool to probe the limits of spacetime.

Astronomers Measure Black Hole Radius
2012-09-27 19:16:53

An international team of astronomers was able to measure the radius of a black hole for the first time.

Standard Model Does Little To Explain Why Earth Is So Dry
2012-07-18 10:59:10

Despite seventy percent of the Earth’s surface being covered by water, in reality the whole of the planet is only made up of 1 percent water, making it relatively dry compared to the gas giants.

Gamma Rays From Milky Way’s Past Show Historically Active Black Hole
2012-05-30 03:39:18

Gamma-ray beams seen in the Milky Way's central black hole suggest that the galaxy's center was much more active in the past, according to new research.


Latest Accretion disc Reference Libraries

8_2c71772f2c3a31994d5208d4518632494
2004-10-19 04:45:44

Cosmogony -- Cosmogony is the study of the origins of celestial objects. It is most commonly used to refer to the study of the origin of the solar system. Currently, the most widely accepted theory is that the solar system was formed roughly 5 billion years ago with the collapse of a nebula of gas and dust, likely caused by shock waves generated by a nearby supernova. The solar system would have formed as a member of a star cluster, now long-since dispersed throughout the Milky Way over...

6_1446abbc556d86191d7944d6c5cf68052
2004-10-19 04:45:43

X-ray Burster -- X-ray bursters are a class of binary stars which are luminous in X-rays. They contain a neutron star and a low-mass companion star. The companion fills its Roche lobe and therefore the neutron star is accreting matter from it. The inflowing gas forms an accretion disk around the neutron star. Sometimes X-ray bursters show a sudden increase in their X-ray luminosity, called X-ray burst. All properties of the X-ray bursts can be explained assuming that they result from...

6_c7a74d948ad4cfdc1dd54ceada2509fb2
2004-10-19 04:45:42

Seyfert Galaxy -- Seyfert galaxies are spiral or irregular galaxies containing an extremely bright nucleus, most likely caused by a supermassive black hole, that can sometimes outshine the surrounding galaxy. The light from the central nucleus varies in less than a year, which implies that the emitting region must be less than one light year across. They are named for the astronomer Carl Seyfert, who studied them extensively in the 1940s. They are a subclass of active galactic nuclei....

6_c74ddf89e1e986e7de2e5e2451d6b60b2
2004-10-19 04:45:41

Microquasar -- Microquasars are smaller cousins of quasars. They are named after quasars, as they have some common characteristics: strong and variable radio emission often seen as radio jets, and an accretion disk surrounding a black hole. In quasars, the black hole is supermassive (millions of solar masses) as in microquasars, the black hole mass is a few solar masses. In microquasars, the accreted mass comes from a normal star and the accretion disk is very luminous in optical regions...

6_75b9b62fd255ef9e172fae83099783a52
2004-10-19 04:45:41

Accretion Disk -- An accretion disk is a structure formed by material falling into a gravitational source. Conservation of angular momentum requires that, as a large cloud of material collapses inward, any small rotation it may have will increase. Centrifugal force causes the rotating cloud to collapse into a disk, and tidal effects will tend to align this disk's rotation with the rotation of the gravitational source in the center. Friction between the particles of the disk generates heat...

More Articles (5 articles) »
Word of the Day
bawbee
  • A coin originally worth six pennies Scots, and later three; held equivalent to an English halfpenny.
  • (in plural) Money; cash.
Related