First Measurement of Cluster Temperature Using the Thermal Sunyaev-Zel’dovich Effect | Zendy

Steen H. Hansen | Zendy; S. Pastor | Zendy; D. Semikoz | Zendy

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First Measurement of Cluster Temperature Using the Thermal Sunyaev-Zel’dovich Effect

Author(s) -

Steen H. Hansen,

S. Pastor,

D. Semikoz

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/342094

Subject(s) - cosmic microwave background , sunyaev–zel'dovich effect , physics , galaxy cluster , cluster (spacecraft) , astrophysics , millimeter , electron , cosmic background radiation , electron temperature , microwave , radiation , galaxy , nuclear physics , optics , computer science , programming language , anisotropy , quantum mechanics

We discuss a new method of finding the cluster temperatures which isindependent of distance and therefore very useful for distant clusters. The hotgas of electrons in clusters of galaxies scatters and distorts the cosmicmicrowave background radiation in a well determined way. ThisSunyaev-Zel'dovich (SZ) effect is a useful tool for extracting informationabout clusters such as their peculiar radial velocity and optical depth. Herewe show how the temperature of the cluster can be inferred from the SZ effect,in principle without use of X-ray data. We use recent millimetre observation ofAbell 2163 to determine for the first time a cluster temperature using SZobservations only. The result T_e = 26^+34_-19 keV at 68% confidence level (at95% c.l. we find T>1.5 keV) is in reasonable agreement with the X-ray results,T_e =12.4^+2.8_-1.9 keV.Comment: 7 pages, 2 figure

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