6533b7ddfe1ef96bd127468f

RESEARCH PRODUCT

The great attractor and the COBE quadrupole

subject

description

A nonlinear model for the Great Attractor is built. It is based on the Tolman-Bondi solution of the Einstein equations. The angular temperature distribution of the Cosmic Microwave Background produced by the Great Attractor is numerically obtained. Several realizations of the Great Attractor are studied. In all the cases, the distance from the Great Attractor to the Local Group is ≈ 43h−1 Mpc, the density contrast reduces to a half of the central value at a radius of 9h−1 Mpc ⪯ Rc ⪯ 14h−1 Mpc, and the dipole due to the infall towards the inhomogeneity center is 1.33 × 10−3 ⪯ D ⪯ 1.8 × 10−3. A complete arbitrary background is assumed; the density parameter, Σ and the reduced Hubble constant, h, (H = 100h Km s−1 Mpc−1) are 0.2 ⪯ Σ ⪯ 1 and 0.5 ⪯ h ⪯ 1 respectively. The total quadrupole Q is split in two parts, the relativistic Doppler quadrupole, QD, and the reduced quadrupole, Qr, produced by nonlinear gravity. The quadrupoles of the chosen realizations appear to satisfy the following inequalities 5 x 10−7 ⪯ Q ⪯ 12.5 ξ 10−7 and −0.4 ξ 10−7 ⪯ Qr ⪯ 1.6 ξ 10−7; this means that |Qr| ranges from 0.8 % to 3.2 % of the quadrupole Qrms measured by LOBE. Therefore, the subtraction of Qr from Qrms becomes irrelevant.