期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 53, 期 1, 页码 57-62出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/53.1.57
关键词
cosmic microwave background; cosmology : observations; distance scale; galaxies : clusters : individual (RX J1347-1145); X-rays : galaxies
We report on mapping observations toward the region of the most luminous X-ray cluster, RX J1347-1145 (z = 0.45), through the Sunyaev-Zel'dovich effect at 21 GHz and 150 GHz with the Nobeyama 45-m telescope. While a low angular resolution image at 21 GHz (beam-size sigma (FWHM) of 76 ) shows a consistent feature with the ROSAT/HRI X-ray image, a higher angular resolution image (sigma (FWHM) = 13 ) at 150 GHz reveals complex morphological structures of the cluster region, which cannot be simply described by the spherical isothermal beta -model. If such inhomogeneous morphological features prove to be generic for high-redshift clusters, distance measurements to the clusters based on their Sunyaev-Zel'dovich data with low angular resolution imaging should be interpreted with caution.
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