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| Paper: |
Cosmological Constant with Sunyaev-Zel'dovich Effect towards Distant Galaxy Clusters |
| Volume: |
289, The Proceedings of the IAU 8th Asian-Pacific Regional Meeting, Volume I |
| Page: |
255 |
| Authors: |
Tsuboi, M.; Kasuga, T.; Miyazaki, A.; Kuno, N.; Sakamoto, A.; Matsuo, H. |
| Abstract: |
We have observed the Sunyaev-Zeldovich (S-Z) effect towards four distant galaxy clusters from z = 0.18-0.55 at 43 GHz using a newly developed 6-beam receiver installed in the Nobeyama 45-m telescope. The S-Z effects at the cluster center at the Rayleigh-Jeans limit are -1.38±0.07 mK for CL0016+16, -0.95 +- 0.20 mK for MS1358+62, -0.63 +- 0.16 mK for MS1008-12, and -0.73 +- 0.10$ mK for A2218, respectively. The S-Z effect for MS1008-12 is a new detection. Assuming that the dimensionless cosmological constant is Omega_Lambda = 0.7, the Hubble constant is estimated to be H0 = 67 +- 13 km s^-1 Mpc^-1. This is consistent with the value in the nearby universe obtained by the Hubble Space Telescope (HST). On the contrary, assuming that the derived value is equal to that by HST, the results are in agreement with the dimensionless cosmological constant of Omega_Lambda about 0.7. |
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