Re: XMM-Newton probes formation of galaxy clusters (Forwarded)
- From: jgreen@xxxxxxxxxxx
- Date: 7 Sep 2005 02:56:45 -0700
Steve Willner wrote:
> In article <1125553970.350803.91270@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
> jgreen@xxxxxxxxxxx writes:
> > Q: If BB theory is correct, according to the above, galaxy clusters
> > should reduce in maturity/not be evident at large distances, so at what
> > distance are they observed?
>
> I'm not sure what the record is at the moment, but there are not many
> clusters known at z>1. What differences they show from nearer
> clusters is very much a topic of active study.
>
> I see there's a published symposium proceedings; I bet it has lots of
> information: _Clusters of Galaxies: Probes of Cosmological Structure
> and Galaxy Evolution_, from the Carnegie Observatories Centennial
> Symposia. Published by Cambridge University Press, as part of the
> Carnegie Observatories Astrophysics Series. Edited by J.S. Mulchaey,
> A. Dressler, and A. Oemler, 2004.
>
> A quick search also turned up Masami Ouchi's PhD dissertation from
> 2003. He finds evidence of structure at z=4.9, but this is not the
> same as a fully-developed, relaxed cluster. Ouchi claims the
> structure is consistent with BB models.
>
> Weinberg et al. (2004 ApJ 601, 1) use numerical models of lambda-CDM
> cosmology to predict cluster correlation lengths. They claim the
> models are in good agreement with SDSS data.
>
> These should give you a good starting point, but as I say, this whole
> subject is under active study. The references above are just the
> ones I happened upon in a not-very-systematic search, and there may
> be much better ones around. I think it's fair to say, though, that
> not all the answers are yet known.
Thanks muchly. It will be interesting to see how interpretations of
galaxy associations (gravitationally bound together or not) are formed
by the 'lookers'.
.....and that Mr Ouchi searches VERY hard for clusters at long distance.
Jim G
c'=c+v
.
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