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Latest Polar jet Stories

d858ca065294580f466e1dfae5149471
2010-07-02 06:25:00

For decades, X-ray astronomers have studied the complex behavior of binary systems pairing a normal star with a black hole. In these systems, gas from the normal star streams toward the black hole and forms a disk around it. Friction within the disk heats the gas to millions of degrees -- hot enough to produce X-rays. At the disk's inner edge, near the black hole, strong magnetic fields eject some of the gas into dual, oppositely directed jets that blast outward at about half the speed of...

bcbe0156dc7184fde009fc960d9112c9
2010-06-01 13:25:00

Going against the grain may turn out to be a powerful move for black holes. New research suggests supermassive black holes that spin backwards might produce more ferocious jets of gas. The results have broad implications for how galaxies change over time. "A lot of what happens in an entire galaxy depends on what's going on in the miniscule central region where the black hole lies," said theoretical astrophysicist David Garofalo of NASA's Jet Propulsion Laboratory in Pasadena, Calif....

5f6ac73d290c41a77e176c3f2545c489
2009-12-10 12:53:53

Studies of one of the galaxy's most active black-hole binaries reveal a dramatic change that will help scientists better understand how these systems expel fast-moving particle jets. Binary systems where a normal star is paired with a black hole often produce large swings in X-ray emission and blast jets of gas at speeds exceeding one-third that of light. What fuels this activity is gas pulled from the normal star, which spirals toward the black hole and piles up in a dense accretion disk....

523592ae671aba3d6cc8e4004cd570551
2009-09-18 09:55:00

Black holes are invading stars, providing a radical explanation to bright flashes in the universe that are one of the biggest mysteries in astronomy today. The flashes, known as gamma ray bursts, are beams of high energy radiation "“ similar to the radiation emitted by explosions of nuclear weapons "“ produced by jets of plasma from massive dying stars. The orthodox model for this cosmic jet engine involves plasma being heated by neutrinos in a disk of matter that forms around a...

1f0088a0ff6d82e8d6e72c5b650811d61
2009-04-22 08:57:08

Using the NASA Rossi X-ray Timing Explorer (RXTE) satellite, a team of astronomers have discovered an object predicted, but never seen before "“ a "Ëœjet trail' nebula. Team leader Dr Klaas Wiersema of the University of Leicester will present the discovery on Wednesday 22nd April at the European Week of Astronomy and Space Science conference at the University of Hertfordshire. The RXTE satellite has been scanning the centre of our galaxy every few days for the last years,...

821102b6d8840b85f1350b0a15bc25fa1
2009-03-25 16:25:00

New results from NASA's Chandra X-ray Observatory have made a major advance in explaining how a special class of black holes may shut off the high-speed jets they produce. These results suggest that these black holes have a mechanism for regulating the rate at which they grow. Black holes come in many sizes: the supermassive ones, including those in quasars, which weigh in at millions to billions of times the mass of the Sun, and the much smaller stellar-mass black holes which have measured...

2009-02-11 13:40:03

U.S. and British astrophysicists say they have conducted the first laboratory experiment that accurately models stellar jets and explains how they form. Astrophysicists say they have long been at a loss to explain how the jets of matter streaming from stars achieve their varied shapes. The predominant theory says that jets are essentially fire hoses that shoot out matter in a steady stream, and the stream breaks up as it collides with gas and dust in space, but that doesn't appear to be so...

12bff1736872369004d532cce042509e1
2008-09-17 14:20:00

XMM-Newton has uncovered a well-tuned periodic signal from a super-massive black hole lodged at the centre of a galaxy, ending a long quest for such an object. The discovery provides scientists with a clearer picture on black hole accretion processes and an excellent tool to study active galactic nuclei (AGNs). These periodic signals originating from the black hole are emitted in X-rays, which are blocked out by the Earth's atmosphere. So the team used data from ESA's orbiting X-ray...

7f024cd94fee624a56bf0ee6027351b51
2008-04-10 10:35:00

The image on the left from NASA's Chandra X-ray Observatory shows the first double-sided X-ray jet ever detected from a young star. A similar jet may have been launched from the young Sun and could have had a significant impact on the early solar system.The young star, named DG Tau, is located in the Taurus star-forming region, about 450 light years from Earth. The bright source of X-rays in the middle of the image is DG Tau and the jet runs from the top left to the bottom right, extending to...

2008-01-15 11:46:01

Supermassive black holes spin at speeds approaching the speed of light, new research suggests. Nine huge galaxies were found to contain furiously whirling black holes that pump out energetic jets of gas into the surrounding environment, according to a study using data from NASA's Chandra X-ray Observatory. "We think these monster black holes are spinning close to the limit set by Einstein's theory of relativity, which means that they can drag material around them at...


Latest Polar jet Reference Libraries

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...

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Word of the Day
drawcansir
  • A blustering, bullying fellow; a pot-valiant braggart; a bully.
This word is named for Draw-Can-Sir, a character in George Villiers' 17th century play The Rehearsal.
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