Evidence of Quasi-linear Super-Structures in the Cosmic Microwave Background and Galaxy Distribution

Details Evidence of Quasi-linear Super-Structures in the Cosmic Microwave Background and Galaxy Distribution Evidence of Quasi-linear Super-Structures in the Cosmic Microwave Background and Galaxy Distribution

2010-05-24

arxiv.org/abs/1005.4250v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

34 pages, 13 figures, a version accepted for publication in ApJ. A plot of non-linear PDF (Figure 7) is added. Error bars are

Scientific paper

Recent measurements of hot and cold spots on the cosmic microwave background (CMB) sky suggest a presence of super-structures on (>100 h^{-1}Mpc) scales. We develop a new formalism to estimate the expected amplitude of temperature fluctuations due to the integrated Sachs-Wolfe (ISW) effect from prominent quasi-linear structures. Applying the developed tools to the observed ISW signals from voids and clusters in catalogs of galaxies at redshifts z<1, we find that they indeed imply a presence of quasi-linear super-structures with a comoving radius 100~300 h^{-1}Mpc and a density contrast ~O(0.1). We find that the observed ISW signals are at odd with the concordant \Lambda cold dark matter (CDM) model that predicts Gaussian primordial perturbations at equal to or larger than 3 sigma level. We also confirm that the mean temperature around the CMB cold spot in the southern Galactic hemisphere filtered by a compensating top-hat filter deviates from a mean value at ~3 sigma level, implying that a quasi-linear supervoid or an underdensity region surrounded by a massive wall may reside at low redshifts z<0.3 and the actual angular size (16^\circ-17^\circ) may be larger than the apparent size (4^\circ-10^\circ) discussed in literature. Possible solutions are briefly discussed.

Affiliated with

Also associated with

No associations

Rating

Evidence of Quasi-linear Super-Structures in the Cosmic Microwave Background and Galaxy Distribution 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 Evidence of Quasi-linear Super-Structures in the Cosmic Microwave Background and Galaxy Distribution, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence of Quasi-linear Super-Structures in the Cosmic Microwave Background and Galaxy Distribution will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-118766