Measurement of the Sunyaev-Zel'dovich Effect toward Abell 2218 at 36 GHz

Astronomy and Astrophysics – Astronomy

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Background Radiation, Galactic Clusters, Radio Observation, Radio Sources (Astronomy), Radio Astronomy, Cosmic Rays, X Rays, Hubble Constant, High Temperature Gases

Scientific paper

We performed a millimeter-wave observation of the Sunyaev-Zel'dovich effect toward a moderately distant cD cluster of galaxies, Abell 2218, at 36 GHz using the Nobeyama 45-m telescope. The antenna temperature decrement of the cosmic microwave background radiation (CMB) was measured to be delta TA* = -0.52 +/- 0.15 mK at the central peak position of X-ray emission in the cluster. Assuming that the hot gas in the cluster has isothermality, spherical symmetry, and the b-model density distribution, the Sunyaev-Zel'dovich effect is inferred to be DELTA TORJ = -0.68 +/- 0.19 mK at the Rayleigh-Jeans limit. A combination of this Sunyaev-Zel'dovich effect and X-ray surface brightness suggests that the Hubble constant is H0 (q0 = 0.5) = 54(sup +51, sub -21) km/s Mpc.

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