2010/05/31 by Kaiki Taro Inoue, Nobuyuki Sakai, Kenji Tomita
Physics and Astronomy · #Amplitude #Astronomy #Astrophysics #COSMIC cancer database #Cold dark matter #Cosmic background radiation #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark matter #Density contrast #Galaxies: Formation, Evolution, Phenomena #Galaxy #Optics #Physics #RADIUS #Redshift #Scientific Research and Discoveries #Sky #Structure formation #astro-ph.CO #gr-qc
paper · pdf · doi:10.1088/0004-637x/724/1/12
published as Astrophys. J., 724, p12-25 (2010) · 34 pages, 13 figures, a version accepted for publication in ApJ. A plot of non-linear PDF (Figure 7) is added. Error bars are added in figure 8
arxiv created 2010/10/27 · openalex publication_date 2010/10/27 · arxiv updated 2012/08/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
ABSTRACT Recent measurements of hot and cold spots on the cosmic microwave background (CMB) sky suggest the 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 of 100 ∼ 300 h −1 Mpc and a density contrast |δ| ∼ O (0.1). We also find that the observed ISW signals are at odds with the concordant Λ cold dark matter model that predicts Gaussian primordial perturbations at ≳3σ level. We confirm that the mean temperature around the CMB cold spot in the southern Galactic hemisphere filtered by a compensating top-hat filter deviates from the mean value at ∼3σ 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°–17°) may be larger than the apparent size (4°–10°) discussed in literature. Possible solutions are briefly discussed.