 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
Hungry For More
Cambridge MA (SPX) Jan 19, 2005 When a star or another stellar object brilliantly explodes in space, it usually signals the destruction of something. In the case of a blast spotted by NASA's Chandra X-ray Observatory, astronomers have recorded the most powerful explosion ever seen and they are amazed by what it's created. The blast is taking place inside a galaxy cluster called MS 0735.6+7421. The eruption appears to have lasted more than 100 million years and produced the energy equivalent of hundreds of millions of gamma-ray bursts. Chandra scientists believe the explosion is the product of enormous amounts of matter being gobbled up by an apparently famished black hole. The new Chandra images show a cloud of gas with two eroding cavities. Invisible to the naked eye, the cavities are believed to be caused by twin jets of matter momentarily expelled by the black hole. Chandra's unique ability to observe hot gas clusters allowed it to make this discovery that other telescopes missed. A typical black hole usually forms after a dense neutron star collapses. When a star withers and burns out, a compact core of neutrons is left behind. As the particles are compressed together, they normally exert enough outward resistant pressure to sustain the size of the core. However, if enough neutrons are present, their combined gravitational attraction will overwhelm this pressure and cause the core to collapse and condense. The result is a relatively tiny object with such strong gravitational pull that not even light can escape it. A black hole has been created. Once formed, a black hole will begin ingesting the gas, stars and other galactic material surrounding it. What's surprising scientists is just how much matter this black hole is consuming. "I was stunned to find that a mass of about 300 million suns was swallowed," said Brian McNamara of Ohio University in Athens. As a black hole devours more matter, it grows larger. However, when a black hole swells in size, its appetite generally decreases. The evidence provided by Chandra shows the hole is as hungry as ever. "This black hole is feasting when it should be fasting," said Paul Nulsen of the Harvard-Smithsonian Center of Astrophysics. The mechanics of mammoth supermassive black holes like the one in MS 0735.6+7421 are unknown. How this peculiar black hole formed and why it continues to eat so ferociously are very big questions for astronomers. Scientists also wonder if the hole will keep the surrounding gas from cooling or generate large magnetic fields in the area. These are compelling questions that should certainly give experts using the Chandra X-Ray Observatory something hearty to chew on and whet their appetites for more. Community Email This Article Comment On This Article Related Links Chandra X-ray Observatory Center NASA's John F. Kennedy Space Center SpaceDaily Search SpaceDaily Subscribe To SpaceDaily Express Nuclear Space Technology at Space-Travel.com
JHU-STScI Team Maps Dark Matter In Startling Detail
Baltimore MD (SPX) Dec 12, 2005Clues revealed by the recently sharpened view of the Hubble Space Telescope have allowed astronomers to map the location of invisible "dark matter" in unprecedented detail in two very young galaxy clusters. |
|
|
| The content herein, unless otherwise known to be public domain, are Copyright 1995-2006 - SpaceDaily.AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA PortalReports are copyright European Space Agency. All NASA sourced material is public domain. Additionalcopyrights 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 SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement |
