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ANU study says the early universe may not have been so violent.



 
 
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  #1  
Old September 18th 04, 05:12 AM
Wally Anglesea
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Default 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  
Old September 22nd 04, 07:07 AM
BP
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Default

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  
Old September 22nd 04, 10:38 AM
Wally Anglesea™
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Posts: n/a
Default

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



--

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  #4  
Old September 22nd 04, 07:05 PM
Jonathan Silverlight
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Posts: n/a
Default

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  
Old September 22nd 04, 09:21 PM
BP
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Posts: n/a
Default

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  
Old September 22nd 04, 09:47 PM
Jonathan Silverlight
external usenet poster
 
Posts: n/a
Default

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  
Old September 23rd 04, 12:22 AM
BP
external usenet poster
 
Posts: n/a
Default

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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