Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-19
Mon.Not.Roy.Astron.Soc. 353 (2004) 681
Astronomy and Astrophysics
Astrophysics
9 pages, 9 figures, submitted to MNRAS, references added and minor changes
Scientific paper
10.1111/j.1365-2966.2004.08110.x
We address whether possible scale-dependent deviations from gaussianity in the primordial density field that are consistent with the cosmic microwave background observations could explain the apparent excess of early cluster formation at high redshift. Using two phenomenological non-gaussian models we find that at fixed normalisation to the observed local abundance of massive clusters, the protoclusters observed at z~4 are significantly more likely to develop in strongly non-gaussian models than in the gaussian paradigm. We compute the relative z<1 evolution of X-ray cluster counts in the non-gaussian case with respect to the gaussian expectation, and the relative excess contribution to the CMB power spectrum due to the integrated thermal SZ effect. We find that both the observed hints of an unexpectedly slow evolution in the X-ray counts and the excess power at high l that may have been observed by CMB interferometers can also be reproduced in our non-gaussian simulations.
Diego Jose Maria
Mathis Hugues
Silk Joseph
No associations
LandOfFree
The case for non-gaussianity on cluster scales does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The case for non-gaussianity on cluster scales, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The case for non-gaussianity on cluster scales will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-213726