Cooling flow bulk motion corrections to the Sunyaev Zel'dovich effect

Details Cooling flow bulk motion corrections to the Sunyaev Zel'dovich effect Cooling flow bulk motion corrections to the Sunyaev Zel'dovich effect

2002-09-17

arxiv.org/abs/astro-ph/0209336v1

New Astron. 7 (2002) 587

Astronomy and Astrophysics

Astrophysics

accepted for publication in New Astronomy

Scientific paper

10.1016/S1384-1076(02)00195-1

We study the influence of converging cooling flow bulk motions on the Sunyaev-Zel'dovich (SZ) effect. To that purpose we derive a modified Kompaneets equation which takes into account the contribution of the accelerated electron media of the cooling flow inside the cluster frame. The additional term is different from the usual kinematic SZ-effect, which depends linearly on the velocity, whereas the contribution described here is quadratic in the macroscopic electron fluid velocity, as measured in the cluster frame. For clusters with a large cooling flow mass deposition rate and/or a small central electron density, it turns out that this effect becomes relevant.

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