The finding suggests that there may be more to black holes -- even relatively small ones four to 10 times the size of the sun -- than meets the eye.
Black holes are objects so dense that not even light can escape their gravitational grips. But they do not pass through space unnoticed. Their heavy hands can be found tearing into neighbor objects, which are pulled apart and served up as disks of matter for the black hole's consumption.
The feedings sometimes cause twin jet-like plumes of particles to form, though in small black holes the power of the jets pales in comparison to the total X-ray radiation stemming from the act of accretion itself.
Not so with the black hole in the outskirts of NGC 7793, a spiral galaxy about 12 million light-years away that is part of the Sculptor group. Astronomers discovered the object, also known as a microquasar, sports a massive pair of jets, far bigger than any found from similarly sized black holes.
The jets are slamming into surrounding interstellar gas, causing it to heat up and expand. Scientists used optical, X-ray and radio telescopes to study the gas bubble and tie it to the NGC 7793 black hole.
"They look very much like supernova remnants (the exploded remains of stars), but these bubbles are larger than normal and in a sense more energetic than normal supernova remnants," lead researcher Manfred Pakull, with the University of Strasbourg, France, told Discovery News.
"It's a very neat piece of research," added Dan Evans, an astrophysicist with the Massachusetts Institute of Technology. "When you see a black hole, the total energy output could be vastly larger than what you can observe with light. This has implications for how black holes grow, evolve and affect their environments."
The research is published in this week's issue of Nature.
i think something ore somebody is comi ng
it is in the outskirts of the spiral galaxy NGC 7793 (eso0914b). From the size and expansion velocity of the bubble the astronomers have found that the jet activity must have been ongoing for at least 200 000 years.
Astronomers do not have yet any means of measuring the size of the black hole itself. The smallest stellar black hole discovered so far has a radius of about 15 km. An average stellar black hole of about 10 solar masses has a radius of about 30 km, while a “big” stellar black hole may have a radius of up to 300 km. This is still much smaller than the jets, which extend out to several hundreds light years on each side of the black hole, or about several thousand million million km!
This result appears in a paper published in this week’s issue of the journal Nature (A 300 parsec long jet-inflated bubble around a powerful microquasar in the galaxy NGC 7793, by Manfred W. Pakull, Roberto Soria and Christian Motch).
ESO, the European Southern Observatory, is the foremost intergovernmental astronomy organisation in Europe and the world’s most productive astronomical observatory. It is supported by 14 countries: Austria, Belgium, the Czech Republic, Denmark, France, Finland, Germany, Italy, the Netherlands, Portugal, Spain, Sweden, Switzerland and the United Kingdom. ESO carries out an ambitious programme focused on the design, construction and operation of powerful ground-based observing facilities enabling astronomers to make important scientific discoveries. ESO also plays a leading role in promoting and organising cooperation in astronomical research. ESO operates three unique world-class observing sites in Chile: La Silla, Paranal and Chajnantor. At Paranal, ESO operates the Very Large Telescope, the world’s most advanced visible-light astronomical observatory and VISTA, the world’s largest survey telescope. ESO is the European partner of a revolutionary astronomical telescope ALMA, the largest astronomical project in existence. ESO is currently planning a 42-metre European Extremely Large optical/near-infrared Telescope, the E-ELT, which will become “the world’s biggest eye on the sky”.
http://www.eso.org/public/news/eso1028/ ... op+News%29
silentlucidity wrote:sorry to burst the bubble,so to speak,but that is a computer generated pic of what they think it....MIGHT look like,x-ray scopes do not show those kind or images,really wish it was real,wish I could create a pic that looks that awesome, but alas I can't.There is NO WAY to image that from that far away,
this one is definitely created with computer. But the other one looks real. But i think you right on this distance so big. It is very strange phenomenon. A black hole, according to the general theory of relativity, is a region of space from which nothing, including light, can escape. But now it blows a bubble? .Around a black hole there is an undetectable surface which marks the point of no return, called an event horizon.
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