Note on the Sunyaev-Zel'dovich thermal effect

Details Note on the Sunyaev-Zel'dovich thermal effect Note on the Sunyaev-Zel'dovich thermal effect

2003-05-08

arxiv.org/abs/astro-ph/0305144v3

Astronomy and Astrophysics

Astrophysics

3 pages. Typos corrected

Scientific paper

In a previous publication we have derived an expression for the full distorted spectrum arising when the photons of the cosmic background radiation are absorbed and emitted by an optically thin gas. The expression simply adds up the effects of the joint probability that an electron absorbs an incoming photon of frequency}$\bar{\nu}${\small and emits it with a frequency}$\nu ${\small . We here show that such an expression is identical to the Kompaneets equation describing the thermal Sunyaev-Zel'dovich effect. This clearly shows that the two pictures, diffusion and absorption-emission are mathematically equivalent to first order in the Compton parameter. Other consequences of this result are also discussed.

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