Mj. Fullana et al., ON THE MICROWAVE BACKGROUND ANISOTROPY PRODUCED BY GREAT ATTRACTOR-LIKE STRUCTURES, The Astrophysical journal. Supplement series, 94(1), 1994, pp. 1-16
We model the effect on the cosmic microwave background of Great Attrac
tor-like structures located at various distances from us. These struct
ures are described by using the Tolman-Bondi solution of the Einstein
equations. Two values of the density parameter, OMEGA0 = 0.2 and OMEGA
0 = 1, are considered. Physical initial profiles of the energy density
and the peculiar velocity lead to both compensated and uncompensated
models. Nonlinear gauge-invariant computations give the angular distri
bution of the microwave background temperature. Angular sizes, amplitu
des, and angular temperature profiles of various separable contributio
ns to the total anisotropy are estimated and compared among them. Thes
e contributions are produced by the gravitational field, the peculiar
velocities of the observer and the emitter, and the temperature fluctu
ations on the last scattering surface induced by Great Attractor-like
structures. Compatibility with observational evidence is analyzed. It
is proved that the greatest anisotropies are produced by Great Attract
or-like objects located near the last scattering surface. Suitable ang
ular scales for the future detection of these anisotropies are propose
d. For fixed proportions of baryon and dark matter, results strongly d
epend on the value of the density parameter OMEGA0; the smallest aniso
tropies correspond to OMEGA0 = 1.