우주에 노숙자 블랙홀이 ..

거대집단 블랙홀이 소속 은하계도 없이 노숙자로 우주에 나타난 것이 허블망원경에 잡혔다 수요일에 발표되었다. 이 괴물 블랙홀은 거대 은하집단의 심장부에 숨어 있으며 빛도 도망칠 수 없는 엄청난 훕인력을 가지고 중심부로부터 slurping하고 있다. 이 블랙홀은 50억광년 밖으로부터 왔으며 1광년이 6조마일이니 빛이 1년 동안 여행해 가는 거리다. 과학자들이 준성-높은 광도에 강한 전파를 내는작은 별로 블랙홀과 강력하게 연결되어있다-을 찾다가 발견하게 되었다. 우주의 가스에의하여 만들어지며 블랙홀의 가장자리로향하고 있다한다. 이런 준성과 블랙홀은 거대 은하계의 중심부에 위치해 있으며 그들의 조사로는 20개 정도로 19개는 발견이 되었는 데 1개는 은하계중심에 아무런 흔적을 보이지 않는다고한다. 칠레에서 허블망원경과 거대망원경을 사용하는 우주학자들은...자동차가 빛을 강하게 비추면 빛은 보이나 자동차는 안보이는 거대광채라고 말한다

Hubble spies homeless black hole

Wed Sep 14, 1:10 PM ET

WASHINGTON (Reuters) - A supermassive black hole appears to be homeless in the cosmos without a galaxy to nestle in, Hubble Space Telescope scientists reported on Wednesday.

Most monster black holes lurk at the heart of massive galaxies, slurping up matter from the galactic center with a pull so strong that nothing, not even light, can escape.

But a team of European astronomers reported in the journal Nature that a particular black hole some 5 billion light-years away has no evidence of a host galaxy. A light-year is about 6 trillion miles, the distance light travels in a year.

The black hole was detected when the scientists went hunting for quasars -- extremely bright, small, distant objects that are strongly associated with black holes. Astronomers believe a quasar is produced by cosmic gas as it is drawn toward the edge of a supermassive black hole.

Most quasars and black holes are in the middle of supermassive galaxies and in their survey of 20 relatively nearby quasars, the scientists found 19 followed this expected pattern. But one showed no signs of having a galactic home.

The astronomers, using the Hubble telescope and the Very Large Telescope in Chile, reported that this rogue black hole may be the result of a rare collision between a seemingly normal spiral galaxy and an exotic object harboring a very massive black hole.

One problem in quasar-hunting is that they are so bright, they outshine most galaxies that surround them, just as the headlights from an oncoming vehicle can make the vehicle hard to see. So even if a surrounding galaxy is present, it can be difficult to detect.

The European astronomers used the two telescopes to overcome this problem by comparing the quasars they were watching with a reference star. This let them differentiate the light from the quasar from the light from any possible underlying galaxy.

Further information is available online at http://www.spacetelescope.org.