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Observation of the Sunyaev-Zel'dovich Eect
toward CL0016+16 at 43 GHz
M. Tsuboi et al.
Ibaraki University, Japan
We performed a mapping observation of the Sunyaev-Zel'dovich
eect toward a distant cluster of galaxies, CL0016+16, at 43
GHz using a newly developed 6-beam SIS receiver installed in
the Nobeyama 45-m telescope. The temperature decrement of
the cosmic microwave background radiation was measured to be

T 
A = 0:490:05 mK at the central position of the cluster. The
temperature decrement decreases, as it goes outside from the cen-
tral position, and it becomes the noise level in leaving 130". Using
the isothermal, spherical-symmetrical -model and the observed
parameters, the S-Z eect is inferred to be
TRJ0 = 1:0  0:1
mK at the Rayleigh-Jeans limit. A combination of this S-Z eect
and X-ray surface brightness suggests that the Hubble constant is
H0fq0 = 0:5g = 67 +16
11 km s 1 Mpc 1 .
1