Skip to comments.A Black Hole With the Mass of a Galaxy (as massive as 18 billion Suns)
Posted on 09/08/2010 3:05:04 PM PDT by LibWhacker
Black-hole Located in the Cancer constellation about 3.5 billion light years away, an object dubbed OJ287 is part of a binary black hole system and produces a huge amount of light, fact that is usually associated with the formation of a new galaxy. Quasars mostly consist of a massive black hole, surrounded by a large accretion disk spinning around it, and are powered by the massive amounts of matter falling towards the black hole at its center. Although compacted into objects with a small size, during the feeding process quasars release enough energy to outshine an entire galaxy.
OJ 287 has produced quasi-periodic optical outbursts going back approximately 100 years, as first apparent on photographic plates from 1891. Its central supermassive black hole is claimed to be the largest known, with a mass of 18 billion solar masses, more than six times the value calculated for the previous largest object.
Just like in the Arnold Schwarzenegger and Danny Devito flick Twins, the massive black hole has a puny twin hovering nearby. By observing the orbit of the smaller black hole, astronomers are able to test Einstein's theory of general relativity with stronger gravitational fields than ever before.
The biggest black hole beats out its nearest competitor by six times. Fortunately, its 3.5 billion light years away, forming the heart of a quasar called OJ287. Quasars are extremely bright objects in which matter spiraling into a giant black hole emits large amounts of radiation.
The smaller black hole, which weighs about 100 million Suns, orbits the larger one on an oval-shaped path every 12 years. It comes close enough to punch through the disc of matter surrounding the larger black hole twice each orbit, causing a pair of outbursts that make OJ287 suddenly brighten.
General relativity predicts that the smaller hole's orbit itself should rotate over time, so that the point at which it comes nearest its neighbor moves around in space. This effect is seen in Mercury's orbit around the Sun, on a much smaller scale.
In the case of OJ287, the tremendous gravitational field of the larger black hole causes the smaller black hole's orbit to precess at an impressive 39° each orbit. The precession changes where and when the smaller hole crashes through the disc surrounding its larger sibling.
About a dozen of the resulting bright outbursts have been observed to date, and astronomers led by Mauri Valtonen of Tuorla Observatory in Finland have analysed them to measure the precession rate of the smaller hole's orbit. That, along with the period of the orbit, suggests the larger black hole weighs a record 18 billion Suns.
So just how big can these bad boys get? Craig Wheeler of the University of Texas in Austin, US, says it depends only on how long a black hole has been around and how fast it has swallowed matter in order to grow. "There is no theoretical upper limit," he says.
The most recent outburst occurred on 13 September 2007, as predicted by general relativity. "If there was no orbital decay, the outburst would have been 20 days later than when it actually happened," Valtonen told New Scientist, adding that the black holes are on track to merge within 10,000 years.
Wheeler says the observations of the outbursts fit closely with the expectations from general relativity. "The fact that you can fit Einstein's theory [so well] ... is telling you that that's working," he says.
“My God it’s full of stars!”
-Space Odyssey 2001
If that was 3.5 billion years ago...does it exist today?
18 Billion stars may be headed our way?
No one has said it yet so I may as well.
Oh, yeah. There’s also this.
We’re all gonna die!
“18 Billion stars may be headed our way?”
Sure is better than 99 Luftbaloons.
Queen Sheila Jackson Lee calling and she's upset you are talking about her!
“Sure is better than 99 Luftbaloons.”
or 99 Dead Baboons.....
Just because it’s 3.5 billion light-years away and can’t show a government-issued form of identification doesn’t mean it shouldn’t be allowed to vote for the Democrat of its choice in the November election. Anyone who tries to prevent a black hole from voting must be a racist.
100 million solar masses and it’s “small”! Tremendous potential energy between the two, where does it all go when they merge?
Its the ultimate stimulus bill!
Gives me the chills. I'd love to see it! I suppose the Earth will be safe at this distance, even if the beam is pointed right at us.
Yikes! Somebody better put up a warning sign or a safety fence.
Well as the local “fizzassist” from down the bayou said “ That is going to be one rip-roaring cosmic event when those two suckers merge, time and space be a bending, gravity waves be a propagating and gamma rays be a flying every which way ;^)
Well, Queen Sheila did complain about Hurricanes not having Black names.
So naming the Black Holes after Sheila & Oprah seems most appropriate.