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Chandra Discovers a Cosmic Cannonball

Posted November 28, 2007 5:05 PM

From Science @ NASA:

Astronomers using NASA's Chandra X-ray Observatory have discovered one of the fastest stars ever seen--a "cosmic cannonball" that is challenging theories to explain its blistering speed. The name of the star is RX J0822-4300. It's a neutron star created by the Puppis A supernova explosion about 3700 years ago. Three Chandra observations clearly show the neutron star moving away from the center of the blast. Speed: 3 million mph! At this rate, RX J0822-4300 is destined to escape the Milky Way just millions of years from now.

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Guru
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#1

Re: Chandra Discovers a Cosmic Cannonball

11/29/2007 12:00 AM

At about 0.45% of c, this is probably the fastest astronomical object ever measured.

The Milky Way itself is apparently moving at about 1.5 million mph towards the 'Big Attractor', so this 'RX-J...' is beating it's own galaxy for speed! It will probably not only escape the Galaxy, but also the local group and more.

The proposed mechanism of an asymmetrical supernova explosion is interesting, because it should have produced lots of gravitational waves. The thing probably happened too long ago for those waves to be detectable now, but if there was one such event, there could be more...

Jorrie

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#2
In reply to #1

Re: Chandra Discovers a Cosmic Cannonball

11/29/2007 2:45 AM

'Big Attractor'?

Whats that then? Sounds a bit scary, and believe it or not, I've never heard of it!

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#3
In reply to #2

Re: Chandra Discovers a Cosmic Cannonball

11/29/2007 2:58 AM

'Big Attractor'?

Oops, I should have written "Great Attractor"!

Jorrie

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#4
In reply to #3

Re: Chandra Discovers a Cosmic Cannonball

11/29/2007 3:04 AM

Thanks for that, I had heard of it, but the old memory files were still at home in bed...

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#5
In reply to #3

Re: Chandra Discovers a Cosmic Cannonball

11/30/2007 8:52 AM

Hi Jorrie,

Trust that you can answer this as I wonder about these things (yes wonder is the right word as it never fails to leave me in awe).

If they can still detect background noise from the supposed big bang, why do they have difficulty with waves from this super nova only 3700 years ago?

Thanks,

Kees

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#6

Re: Chandra Discovers a Cosmic Cannonball

11/30/2007 8:57 AM

Hypervelocity stars are thought to have been ejected by interactions with a supermassive black hole in the Galaxy's center, which can act as a sort of "gravitational slingshot." This neutron star, by contrast, was flung into motion by a supernova. Data suggest the explosion was lop-sided, kicking the neutron star in one direction and the debris from the explosion in the other.

Does this mean that they should, theoretically, be able to detect the debris on the other side of its original position, moving away with the same but opposed speed?

Some law on energy and mass would suggest such a thing I thought?

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