Cluster temperature profiles and Sunyaev-Zeldovich observations

Details Cluster temperature profiles and Sunyaev-Zeldovich observations Cluster temperature profiles and Sunyaev-Zeldovich observations

2004-01-20

arxiv.org/abs/astro-ph/0401391v2

Mon.Not.Roy.Astron.Soc. 351 (2004) L5

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, minor typos corrected

Scientific paper

10.1111/j.1365-2966.2004.07920.x

Galaxy clusters are not iso-thermal, and the radial temperature dependence will affect the cluster parameters derived through the observation of the Sunyaev-Zeldovich (SZ) effect. We show that the derived peculiar velocity will be systematically shifted by 10-20%. For future all-sky surveys one cannot rely on the observationally expensive X-ray observations to remove this systematic error, but one should instead reach for sufficient angular resolution to perform a deprojection in the SZ spectra. The Compton weighted electron temperature is accurately derived through SZ observations.

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