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arXiv · 2209.09503

Galaxy clusters at z~1 imaged by ALMA with the Sunyaev-Zel'dovich effect

T. Kitayama·S. Ueda·N. Okabe·T. Akahori·M. Hilton·J. P. Hughes·Y. Ichinohe·K. Kohno·E. Komatsu·Y. -T. Lin·H. Miyatake·M. Oguri·C. Sifón·S. Takakuwa·M. Takizawa·T. Tsutsumi·J. van Marrewijk·E. J. Wollack
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Abstract

We present high angular-resolution measurements of the thermal Sunyaev-Zel'dovich effect (SZE) toward two galaxy clusters, RCS J2319+0038 at z=0.9 and HSC J0947-0119 at z=1.1, by the Atacama Large Millimeter/submillimeter Array (ALMA) in Band 3. They are supplemented with available Chandra X-ray data, optical data taken by Hyper Suprime-Cam on Subaru, and millimeter-wave SZE data from the Atacama Cosmology Telescope. Taking into account departures from spherical symmetry, we have reconstructed non-parametrically the inner pressure profile of two clusters as well as electron temperature and density profiles for RCS J2319+0038. This is one of the first such measurements for an individual cluster at $z \gtrsim 0.9$. We find that the inner pressure profile of both clusters is much shallower than that of local cool-core clusters. Our results consistently suggest that RCS J2319+0038 hosts a weak cool core, where radiative cooling is less significant than in local cool cores. On the other hand, HSC J0947-0119 exhibits an even shallower pressure profile than RCS J2319+0038 and is more likely a non-cool-core cluster. The SZE centroid position is offset by more than 140 $h_{70}^{-1}$kpc from the peaks of galaxy distribution in HSC J0947-0119, suggesting a stronger influence of mergers in this cluster. We conclude that these distant clusters are at a very early stage of developing the cool cores typically found in clusters at lower redshifts.

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T. Kitayama, S. Ueda, N. Okabe, T. Akahori, M. Hilton, J. P. Hughes, Y. Ichinohe, K. Kohno, E. Komatsu, Y. -T. Lin, H. Miyatake, M. Oguri, C. Sifón, S. Takakuwa, M. Takizawa, T. Tsutsumi, J. van Marrewijk, E. J. Wollack. 2022-09-20. Galaxy clusters at z~1 imaged by ALMA with the Sunyaev-Zel'dovich effect. https://doi.org/10.1093/pasj/psac110

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