NASA北京时间16号晨召开关于地球附近未知物体发布会 - 作战2000论坛

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穿短裤的暴徒发表于 2010-11-15 21:13

关于今晚的NASA发布会剧透：NASA Finds Youngest Nearby Black Hole，NASA 发现距离地球五千万光年的年轻黑洞。http://sinaurl.cn/h4Q29T ，目前网站 too many connections，无法访问。这里http://sinaurl.cn/h4gldd 有英文原文，转帖littlepig的在q群发的。

1 C! B% ]1 O; @! }- G4 t0 Y: cEvidence for the youngest known black hole in our cosmic neighborhood has　been found using NASA's Chandra X-ray Observatory and other telescopes. The age and proximity of this object could provide astronomers with a unique opportunity to watch a black hole develop during its infancy.The object in question is associated with SN 1979C, a supernova in the galaxy M100 discovered by an amateur astronomer in 1979. While many likely new black holes in the distant Universe have been detected in the form of gamma-ray bursts (GRBs), this nascent black hole candidate is much closer, at a distance of only 50 million light years from Earth.Data from Chandra, as well as NASA's Swift, the European Space Agency's XMM-Newton and the German ROSAT observatory revealed a bright source of X-rays that has remained steady for the 12 years from 1995 to 2007 over which it has　been observed. This　behavior and the X-ray spectrum, or distribution of X-rays with energy, support the idea that the object is a black hole being fed either by material falling back into the black hole after the supernova, or from a binary companion."If our interpretation is correct, this is the nearest example where the birth of a black hole has　been observed," said Daniel Patnaude of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass. who led the study.The scientists think that SN 1979C formed when a star about 20 times more massive than the Sun collapsed. It was a particular type of supernova where the exploded star had ejected some, but not all of its outer, hydrogen- rich envelope before the explosion, so it is unlikely to have been associated with a GRB. Supernovas have sometimes　been associated with GRBs, but only where the exploded star had completely lost its hydrogen envelope."This may be the first time that the common way of making a black hole has　been observed," said coauthor Abraham Loeb, also of the Harvard-Smithsonian Center for Astrophysics. Most black holes in the Universe should form when the core of a star collapses and a gamma-ray burst is not produced."The idea of a black hole with an observed age of only about 30 years is consistent with some recent theoretical work. In 2005, a theory was presented that the bright optical light of this supernova was powered by a jet from a black hole that was unable to penetrate the hydrogen envelope of the star to form a GRB.Although the evidence points to a newly formed black hole in SN 1979C, another intriguing possibility is that a young, rapidly spinning neutron star with a powerful wind of high energy particles could be responsible for the X-ray emission. This would make the object in SN 1979C the youngest and brightest example of such a "pulsar wind nebula" and the youngest known neutron star. The Crab pulsar, the best-known example of a bright pulsar wind nebula, is about 950 years old."Further observations of this remarkable object with Chandra should provide a powerful test of these two possibilities," said Patnaude.The properties of the X-ray source are not well explained by two other alternatives: the formation of a neutron star with a very strong magnetic field in the explosion, or a strong interaction occurring between the supernova and surrounding material.

ass hole，上帝他老人家最新一次被爆菊花居然让人类给发现了
$ A. V( ^$ N1 k z! o; uwjxsm 发表于 2010-11-16 10:01

NASA Announces Televised Chandra News Conference
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穿短裤的暴徒发表于 2010-11-15 18:10

难道是要公布那个新发现50000光年大小的黑洞。/ P1 y1 F. J, Y) I3 [
kb1273d1 发表于 2010-11-15 22:05

NASA观察到的，是一个距离地球5000万光年的，1979年就开始观测的一个黑洞正太的形成，所以准确地说，这个黑洞正太应该是5000万+31岁了
2 f5 R' A/ H. A$ D4 ~happydoggy 发表于 2010-11-16 15:57