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Gamma Ray Bursts -- Fireballs or Cannonballs?
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Gamma Ray Bursts -- Fireballs or Cannonballs?
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Gamma Ray Bursts -- Fireballs or Cannonballs?
(Jim Graber) wrote in message ...
Has anyone else been paying any attention to the fireball versus cannonball dispute? It seems to me the cannonball guys have some fairly strong points, but no one else seems to agree. Why is this? Is there a fatal flaw in their argument? Why are fireballs so popular? Inquiring minds want to know... TIA Jim Graber wasn't the cannon ball model ruled out last May? At least this is what the press release says: at least this is what I am inferring from the following press release: http://www.nrao.edu/pr/2003/grb030329/ Or am I reading too much into this? anyhow can some expert comment? melroy |
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Gamma Ray Bursts -- Fireballs or Cannonballs?
(Jim Graber) wrote in message ...
Has anyone else been paying any attention to the fireball versus cannonball dispute? It seems to me the cannonball guys have some fairly strong points, but no one else seems to agree. Why is this? Is there a fatal flaw in their argument? Why are fireballs so popular? Inquiring minds want to know... TIA Jim Graber wasn't the cannon ball model ruled out last May? At least this is what the press release says: at least this is what I am inferring from the following press release: http://www.nrao.edu/pr/2003/grb030329/ Or am I reading too much into this? anyhow can some expert comment? melroy |
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Gamma Ray Bursts -- Fireballs or Cannonballs?
(Melroy) writes:
(Jim Graber) wrote in message ... Has anyone else been paying any attention to the fireball versus cannonball dispute? It seems to me the cannonball guys have some fairly strong points, but no one else seems to agree. Why is this? Is there a fatal flaw in their argument? Why are fireballs so popular? Inquiring minds want to know... wasn't the cannon ball model ruled out last May? At least this is what the press release says: at least this is what I am inferring from the following press release: http://www.nrao.edu/pr/2003/grb030329/ Or am I reading too much into this? anyhow can some expert comment? I don't think so. One of the implications of the "hypernova" model is that due to relativistic effects, the gamma-ray bursts are _HIGHLY_ beamed, with opening angles of less than ten milliradians (about 1/2 a degree). We would only an "ordinary" Type Ia "supernova" unless the rotation axis of the nascent black hole from the hypernova happens to be pointing almost DIRECTLY at us --- in which case no significant "proper motion" would be observed. The recent observation by Coburn and Boggs that the gamma rays from a GRB are highly polarized (~80%), strongly supports the "hypernova" model, and strongly disfavors the "fireball" model, which does not have any preferred axis along which to polarize the gamma-rays, and which predicts polarizations of less than a few percent. -- Gordon D. Pusch perl -e '$_ = \n"; s/NO\.//; s/SPAM\.//; print;' |
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Gamma Ray Bursts -- Fireballs or Cannonballs?
I wrote, regarding the current "hypernova" model of GRBs:
[...] We would only see an "ordinary" Type Ia "supernova" unless the rotation axis ^^^^^^^^^ I'm sorry, that should have read "Type II," not "Type Ia." (I guess I have typed "Type Ia" a few too many times, and it has now become a semi-automatic reflex... :-( -- Gordon D. Pusch perl -e '$_ = \n"; s/NO\.//; s/SPAM\.//; print;' |
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Gamma Ray Bursts -- Fireballs or Cannonballs?
I wrote, regarding the current "hypernova" model of GRBs:
[...] We would only see an "ordinary" Type Ia "supernova" unless the rotation axis ^^^^^^^^^ I'm sorry, that should have read "Type II," not "Type Ia." (I guess I have typed "Type Ia" a few too many times, and it has now become a semi-automatic reflex... :-( -- Gordon D. Pusch perl -e '$_ = \n"; s/NO\.//; s/SPAM\.//; print;' |
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