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ANU study says the early universe may not have been so violent.
"The Universe has experienced far fewer collisions among galaxies than
previously thought, according to a new analysis of Hubble Space Telescope data by an ANU researcher. Astronomer Dr Alister Graham, from the Research School of Astronomy and Astrophysics, analysed a sample of galaxies located 100 million light years away - and discovered that the number of violent encounters between large galaxies is around one-tenth of the number earlier studies had suggested. Although theoretical models predict that fewer collisions were involved in the evolution of the universe, Dr Graham's observations are the first that confirm these theories." http://info.anu.edu.au/mac/Media/Med...04Galaxies.asp |
#2
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Wally,
For my Grad thesis project I was thinking about doing simulations of cannibal or colliding galaxies. Any insight? I read that collisions are rare due to interstellar distances. BP "Wally Anglesea" wrote in message ... "The Universe has experienced far fewer collisions among galaxies than previously thought, according to a new analysis of Hubble Space Telescope data by an ANU researcher. Astronomer Dr Alister Graham, from the Research School of Astronomy and Astrophysics, analysed a sample of galaxies located 100 million light years away - and discovered that the number of violent encounters between large galaxies is around one-tenth of the number earlier studies had suggested. Although theoretical models predict that fewer collisions were involved in the evolution of the universe, Dr Graham's observations are the first that confirm these theories." http://info.anu.edu.au/mac/Media/Med...04Galaxies.asp |
#3
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On Tue, 21 Sep 2004 23:07:39 -0700, "BP"
wrote: Wally, For my Grad thesis project I was thinking about doing simulations of cannibal or colliding galaxies. Any insight? I read that collisions are rare due to interstellar distances. Don't look at me, I don't do galaxies :-) My intuition says that there's lots of galaxies, so interactions might be rare, but not that rare. After all, our own galaxy is eating up another, and Stephans Quintet is supposed to have 4 of the galaxies actually gravitationally bound. Whilst rare, my guess is that they would probably happen. The paper I cited obviously suggests that collisions happen, and certainly did in the early universe (this makes sense). If you are going to do simulations, it would be neat to see the results. BP "Wally Anglesea" wrote in message ... "The Universe has experienced far fewer collisions among galaxies than previously thought, according to a new analysis of Hubble Space Telescope data by an ANU researcher. Astronomer Dr Alister Graham, from the Research School of Astronomy and Astrophysics, analysed a sample of galaxies located 100 million light years away - and discovered that the number of violent encounters between large galaxies is around one-tenth of the number earlier studies had suggested. Although theoretical models predict that fewer collisions were involved in the evolution of the universe, Dr Graham's observations are the first that confirm these theories." http://info.anu.edu.au/mac/Media/Med...04Galaxies.asp -- Find out about Australia's most dangerous Doomsday Cult: http://users.bigpond.net.au/wanglese/pebble.htm "You can't fool me, it's turtles all the way down." |
#4
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In message , Wally Anglesea™
writes On Tue, 21 Sep 2004 23:07:39 -0700, "BP" wrote: Wally, For my Grad thesis project I was thinking about doing simulations of cannibal or colliding galaxies. Any insight? I read that collisions are rare due to interstellar distances. Don't look at me, I don't do galaxies :-) My intuition says that there's lots of galaxies, so interactions might be rare, but not that rare. After all, our own galaxy is eating up another, and Stephans Quintet is supposed to have 4 of the galaxies actually gravitationally bound. Whilst rare, my guess is that they would probably happen. The paper I cited obviously suggests that collisions happen, and certainly did in the early universe (this makes sense). If you are going to do simulations, it would be neat to see the results. I wonder if the topic isn't over-subscribed, though. There are simulations which go all the way from a BASIC program in "Astronomy" magazine (which does an amazingly good job), to commercial products, to the very latest super-computer simulations which use millions of particles and include gas dynamics. But if you think you have something new I'll expect to see a web site with some beautiful pictures :-) -- What have they got to hide? Release the ESA Beagle 2 report. Remove spam and invalid from address to reply. |
#5
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Yeah, I don't want to do that if it is over done.
"Oh look, this jerk wants a PhD with yet another Galaxy simulation." No thanks. I guess that is why I asked. Looking for ideas though. BP "Jonathan Silverlight" wrote in message ... In message , Wally AngleseaT writes On Tue, 21 Sep 2004 23:07:39 -0700, "BP" wrote: Wally, For my Grad thesis project I was thinking about doing simulations of cannibal or colliding galaxies. Any insight? I read that collisions are rare due to interstellar distances. Don't look at me, I don't do galaxies :-) My intuition says that there's lots of galaxies, so interactions might be rare, but not that rare. After all, our own galaxy is eating up another, and Stephans Quintet is supposed to have 4 of the galaxies actually gravitationally bound. Whilst rare, my guess is that they would probably happen. The paper I cited obviously suggests that collisions happen, and certainly did in the early universe (this makes sense). If you are going to do simulations, it would be neat to see the results. I wonder if the topic isn't over-subscribed, though. There are simulations which go all the way from a BASIC program in "Astronomy" magazine (which does an amazingly good job), to commercial products, to the very latest super-computer simulations which use millions of particles and include gas dynamics. But if you think you have something new I'll expect to see a web site with some beautiful pictures :-) -- What have they got to hide? Release the ESA Beagle 2 report. Remove spam and invalid from address to reply. |
#6
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In message , BP
writes "Jonathan Silverlight" wrote in message ... In message , Wally AngleseaT writes On Tue, 21 Sep 2004 23:07:39 -0700, "BP" wrote: I wonder if the topic isn't over-subscribed, though. There are simulations which go all the way from a BASIC program in "Astronomy" magazine (which does an amazingly good job), to commercial products, to the very latest super-computer simulations which use millions of particles and include gas dynamics. But if you think you have something new I'll expect to see a web site with some beautiful pictures :-) Yeah, I don't want to do that if it is over done. "Oh look, this jerk wants a PhD with yet another Galaxy simulation." No thanks. I guess that is why I asked. Looking for ideas though. BP Hey, I don't want to put you off :-) Ask the experts. There may be new algorithms, new methods using modern computing power. Or look at galaxy structure. Really off-the-wall idea - see if you can incorporate Hannes Alfven's ideas about electrical effects and see if that gives a better fit than conventional models. He's been dead for nearly 10 years so unless someone's been following up his ideas there is room for something new. |
#7
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No, John don't worry about it...
I mean, really if I do something I don't want to hear "not another...". That is just me. I talked to a astrophysicist today about N-Body problems and Hydrodynamics. He said I was on the right track. I just need to find the right track. And, yeah your right. Finding a new way model it would be great. The great thing is that even though all the "big" ideas have been done already. There is still room for us to find lots of little great ideas. So, I think the N-Body problems seem interesting. I think I may hit the online articles to see what I come up with. Any ideas, shoot em over. BP Hey, I don't want to put you off :-) Ask the experts. There may be new algorithms, new methods using modern computing power. Or look at galaxy structure. Really off-the-wall idea - see if you can incorporate Hannes Alfven's ideas about electrical effects and see if that gives a better fit than conventional models. He's been dead for nearly 10 years so unless someone's been following up his ideas there is room for something new. |
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