Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. 24/7 Space News .




TIME AND SPACE
Surprisingly strong magnetic fields challenge black holes' pull
by Staff Writers
Berkeley CA (SPX) Jun 05, 2014


This is a computer simulation of gas (in yellow) falling into a black hole (too small to be seen). Twin jets are also shown with magnetic field lines. Image courtesy Alexander Tchekhovskoy, Berkeley Lab.

A new study of supermassive black holes at the centers of galaxies has found magnetic fields play an impressive role in the systems' dynamics. In fact, in dozens of black holes surveyed, the magnetic field strength matched the force produced by the black holes' powerful gravitational pull, says a team of scientists from the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) and Max Planck Institute for Radio Astronomy (MPIfR) in Bonn, Germany. The findings are published in this week's issue of Nature.

"This paper for the first time systematically measures the strength of magnetic fields near black holes," says Alexander Tchekhovskoy, the Berkeley Lab researcher who helped interpret the observational data within the context of existing computational models. "This is important because we had no idea, and now we have evidence from not just one, not just two, but from 76 black holes."

Previously, Tchekhovskoy, who is also a postdoctoral fellow at the University of California, Berkeley, had developed computational models of black holes that included magnetic fields. His models suggested a black hole could sustain a magnetic field that was as strong as its gravity, but there was not yet observational evidence to support this prediction. With the two forces balancing out, a cloud of gas caught on top of the magnetic field would be spared the pull of gravity and instead levitate in place.

The magnetic field strength was confirmed by evidence from jets of gas that shoot away from supermassive black holes. Formed by magnetic fields, these jets produce a radio emission. "We realized that the radio emission from black holes' jets can be used to measure the magnetic field strength near the black hold itself," says Mohammad Zamaninasab, the lead author of the study, who did the work while at MPIfR.

Other research teams had previously collected radio-emission data from "radio-loud" galaxies using the Very Long Baseline Array, a vast network of radio telescopes in the United States. The researchers analyzed this pre-existing data to create radio-emission maps at different wavelengths. Shifts in jet features between different maps let them calculate the field strength near the black hole.

Based on the results, the team found not only that the measured magnetic fields can be as strong as a black hole's gravity, but that they are also comparable in strength to those produced inside MRI machines found in hospitals--roughly 10,000 times greater than the field of the Earth itself.

Tchekhovskoy says the new results mean theorists must re-evaluate their understanding of black-hole behavior. "The magnetic fields are strong enough to dramatically alter how gas falls into black holes and how gas produces outflows that we do observe, much stronger than what has usually been assumed," he says. "We need to go back and look at our models once again."

.


Related Links
DOE/Lawrence Berkeley National Laboratory
Understanding Time and Space






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





TIME AND SPACE
Black Hole 'Batteries' Keep Blazars Going and Going
Greenbelt MD (SPX) Jun 05, 2014
Astronomers studying two classes of black-hole-powered galaxies monitored by NASA's Fermi Gamma-ray Space Telescope have found evidence that they represent different sides of the same cosmic coin. By unraveling how these objects, called blazars, are distributed throughout the universe, the scientists suggest that apparently distinctive properties defining each class more likely reflect a change ... read more


TIME AND SPACE
New evidence supporting moon formation via collision of 2 planets

NASA Missions Let Scientists See Moon's Dancing Tide From Orbit

Earth's gravitational pull stretches moon surface

Water in moon rocks provides clues and questions about lunar history

TIME AND SPACE
NASA Should Maintain Long-Term Focus on Mars as "Horizon Goal"

NASA could not deliver humans to Mars

Big Brother creators to document Mars One mission

NASA's human spaceflight program doomed to fail: study

TIME AND SPACE
NASA And Virgin Galactic Select Payloads For First Research Flight

US may lose 'star wars' to Russia

NASA Invites Universities to Submit Innovative Technology Proposals

One docking ring to rule them all

TIME AND SPACE
Chinese lunar rover alive but weak

China's Jade Rabbit moon rover 'alive but struggling'

Chinese space team survives on worm diet for 105 days

Moon rover Yutu comes closer to public

TIME AND SPACE
Russia, US resume talks on new joint projects for ISS

Russian Soyuz with New Crew Docks at ISS in Automatic Mode

Russian, German and US astronauts dock with ISS

Six-Person Station Crew Enjoys Day Off Following Docking

TIME AND SPACE
Next ATV transferred to Final Assembly Building at Kourou

Roscosmos Scolded for 'Pestering Society' with Proton Crash Theories

SpaceX unveils capsule to ferry astronauts to space

Elon Musk to present manned DragonV2 spacecraft on May 29

TIME AND SPACE
Two planets orbit nearby ancient star

First light for SPHERE exoplanet imager

Astronomers Confounded By Massive Rocky World

Astronomers find a new type of planet: The 'mega-Earth'

TIME AND SPACE
Raytheon selected to demonstrate next generation, modular radar system

Analyzing Resistance to Impacts and Improving Armor Plating

Intel's gesture control promises hands-free life at Taiwan show

A new way to make laser-like beams using 250x less power




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.