Boltzmann approach to the large-angle cosmic X-ray background fluctuations

Details Boltzmann approach to the large-angle cosmic X-ray background fluctuations Boltzmann approach to the large-angle cosmic X-ray background fluctuations

1998-05-13

arxiv.org/abs/astro-ph/9805168v1

Astronomy and Astrophysics

Astrophysics

15 pages, 5 figures, MNRAS in press

Scientific paper

10.1046/j.1365-8711.1998.01647.x

Large-angle fluctuations in the cosmic X-ray background are investigated by a new formalism with a simple model of the X-ray sources. Our method is formulated from the Boltzmann equation and a simple extension of the work by Lahav et al. to be applicable to a hyperbolic (open) universe. The low multipole fluctuations due to the source clustering are analyzed in various cosmological models in both numerical and analytic way. The fluctuations strongly depend on the X-ray sources evolution model, as pointed out previously. It turns out that the nearby ($z \lesssim 0.1$) sources are the dominant contributors to the large-angle fluctuations. If these nearby sources are removed in an observed X-ray map, the dipole (low multipole) moment of the fluctuation drastically decreases. In this case the Compton-Getting effect of an observer's motion can be a dominant contribution to the dipole fluctuation. This feature of fluctuation, relating to the matter power spectrum, is discussed.

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