2024-03-28T09:26:54Z
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oai:tsukuba.repo.nii.ac.jp:02001544
2022-04-27T10:54:21Z
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Deeply cooled core of the Phoenix galaxy cluster imaged by ALMA with the Sunyaev–Zel’dovich effect
Kitayama, Tetsu
Ueda, Shutaro
Akahori, Takuya
Komatsu, Eiichiro
Kawabe, Ryohei
Kohno, Kotaro
Takakuwa, Shigehisa
Takizawa, Motokazu
Tsutsumi, Takahiro
吉川, 耕司
ヨシカワ, コウジ
YOSHIKAWA, Kohji
open access
© The Author(s) 2020. Published by Oxford University Press on behalf of the Astronomical Society of Japan. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
We present measurements of the thermal Sunyaev–Zel’dovich effect (SZE) toward SPT-CL J2334-4243 (the Phoenix galaxy cluster) at z=0.597 by the Atacama Large Millimeter/submillimeter Array (ALMA) in Band 3. The SZE is imaged at 5′′ resolution (corresponding to the physical scale of 23h−1kpc) within 200h−1kpc from the central galaxy, with the peak signal-to-noise ratio exceeding 11. Combined with the Chandra X-ray image, the ALMA SZE data further allow for non-parametric deprojection of electron temperature, density, and entropy. Our method can minimize contamination by the central active galactic nucleus and the X-ray absorbing gas within the cluster, both of which greatly affect the X-ray spectrum. We find no significant asymmetry or disturbance in the SZE image within the current measurement errors. The detected SZE signal shows much higher central concentration than other distant galaxy clusters and agrees well with the average pressure profile of local cool-core clusters. Unlike in typical clusters at any redshift, the gas temperature drops by at least a factor of 5 toward the center. We identify ∼6×1011M⊙ cool gas with temperature ∼3keV in the inner 20h−1kpc. Taken together, our results imply that the gas is indeed cooling efficiently and nearly isobarically down to this radius in the Phoenix cluster.
Oxford University Press
2020-03
eng
journal article
http://hdl.handle.net/2241/0002001544
https://tsukuba.repo.nii.ac.jp/records/2001544
https://doi.org/10.1093/pasj/psaa009
0004-6264
AA1082896X
PASJ : Publications of the Astronomical Society of Japan
72
2
33
https://tsukuba.repo.nii.ac.jp/record/2001544/files/PASJ_72-2.pdf
application/pdf
3.1 MB
2021-10-07