General similarity solutions are obtained for spherical, cooling blast waves in an Omega(b) much less than Omega = 1 universe, given an energy input that is some power of time. The distortion of the microwave background is calculated in terms of the present-day peculiar velocities and the present-day voids in velocity space caused by the explosions...
The possibility that the diffuse X-ray background (XRB) could have been generated by the infall of baryons into the potential wells of dark matter is investigated within the framework of a hot dark matter (neutrino)-dominated universe. The XRB spectrum is fitted with the thermal bremsstrahlung kernel, and constraints on the nature of the infall and...
If the universe were radiation-dominated at redshifts greater than about 100-1000, e.g., due to the presence of a small fraction of light particles in the dark matter, it would be optically thin in soft gamma-rays up to redshifts of 10,000. This is larger by an order of magnitude than for the matter-dominated universe. X-rays and gamma-rays produce...
A tight mass-temperature relation, M(r)/r proportional to T-x, is expected in most cosmological models if clusters of galaxies are homologous and the intracluster gas is in global equilibrium with the dark matter. We here calibrate this relation using eight clusters with well-defined global temperatures measured with ASCA and masses inferred from w...
A tight mass-temperature relation, M(r)/r proportional to T-x, is expected in most cosmological models if clusters of galaxies are homologous and the intracluster gas is in global equilibrium with the dark matter. We here calibrate this relation using eight clusters with well-defined global temperatures measured with ASCA and masses inferred from w...
