Massive galaxy cluster could upend theory of universe evolut

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  • #2
Chronos
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It's an admittedly [by the researchers themselves] unsubstantiated finding.
 
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Garth
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According to the video, the cluster is 3.3 billion years old as we see it today

And super clusters are up to 1000 trillion solar masses

I don't understand what is so uniquely out of the ordinary
 
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Garth
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According to the video, the cluster is 3.3 billion years old as we see it today

And super clusters are up to 1000 trillion solar masses

I don't understand what is so uniquely out of the ordinary
The problem of explaining a 4 x 10^14 Solar Mass cluster forming only 800 million years after BB.

An age problem?

Garth
 
  • #6
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The article states 0.8 Gyr

The video states 3.3 Gyr

Which is it?

Perhaps the cluster formed about 2.5 Gyr after the big bang...

And evolved for another 0.8 Gyr...

Into the way we see it on the sky today?
 
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Garth
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The problem of explaining a 4 x 10^14 Solar Mass cluster forming only 800 million years after BB.

An age problem?

Garth
My bad - an age problem? No.
From the arXiv paper Chandra deep observation of XDCP J0044.0-2033, a massive galaxy cluster at z>1.5
Given its mass and the XDCP survey volume, XDCP J0044.0-2033 does not create significant tension with the WMAP-7 CDM cosmology.
The super-cluster is seen as it was 9.6Gyr ago. It was then 0.8Gyr old, so it formed 3.3Gyr after BB, 9.6+0.8+3.3=13.7, the age of the universe.

Note there was a high density of Intercluster medium (ICM) which had a total mass of (1.48±0.20)×1013M⊙ i.e. roughly 10% of the mass of the clusters in that central region with an iron abundance of ZFe = 0.41(+0.29−0.26) ZFe⊙ (nearly half Solar abundance)

As iron is the last element to be synthesised by nuclear fusion in stellar cores there may be a question of whether there had been enough time for this to be produced and then scattered into the inter-cluster medium.


Garth
 
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