Substructures revealed by the Sunyaev-Zel'dovich effect at 150GHz in a high resolution map of RXJ1347-1145

Eiichiro Komatsu1,2, Hiroshi Matsuo3, Tetsu Kitayama4, Makoto Hattori2, Ryohei Kawabe5,
Kotaro Kohno5, Nario Kuno5, Yasushi Suto6,7, Sabine Schindler8 and Kohji Yoshikawa9

1. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544-1001, USA
2. Astronomical Institute, Tohoku University, Aoba, Sendai 980-8578, Japan
3. National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan
4. Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
5. Nobeyama Radio Observatory, Minamimaki, Minamisaku, Nagano 384-1305, Japan
6. Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan
7. Research Center for the Early University, School of Science, The University of Tokyo, Tokyo 113-0033, Japan
8. Astrophysics Research Institute, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF, UK
9. Department of Astronomy, Kyoto University, Kyoto 606-8502, Japan

Abstract

We report on mapping observations toward the region of the most luminous X-ray cluster RXJ1347-1145 (z=0.45) through the Sunyaev-Zel'dovich effect at 21GHz and 150GHz with the Nobeyama 45-m telescope. While a low angular resolution image at 21GHz (beam-size of 76'') shows a consistent feature with the ROSAT/HRI X-ray image, a higher angular resolution image (13'') at 150GHz 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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