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Measurements of resonant scattering in the Perseus Cluster core with Hitomi SXS

2018; Oxford University Press; Volume: 70; Issue: 2 Linguagem: Inglês

10.1093/pasj/psx127

2053-051X

F. Aharonian, Hiroki Akamatsu, Fumie Akimoto, S. W. Allen, L. Angelini, M. Audard, Hisamitsu Awaki, M. Axelsson, Aya Bamba, M. Bautz, R. D. Blandford, Laura Brenneman, G. V. Brown, Esra Bülbül, Edward Cackett, M. Chernyakova, Meng P. Chiao, P. Coppi, E. Costantini, J. de Plaa, C. P. de Vries, Jan-Willem den Herder, Chris Done, Tadayasu Dotani, K. Ebisawa, Megan E. Eckart, Teruaki Enoto, Yuichiro Ezoe, Andrew C Fabian, C. Ferrigno, Adam R Foster, Ryuichi Fujimoto, Yasushi Fukazawa, Maki Furukawa, Akihiro Furuzawa, M. Galeazzi, Luigi Gallo, Poshak Gandhi, M. Giustini, A. Goldwurm, Liyi Gu, M. Guainazzi, Yoshito Haba, Kouichi Hagino, Kenji Hamaguchi, I. Harrus, Isamu Hatsukade, Katsuhiro Hayashi, Takayuki Hayashi, Kiyoshi Hayashida, Junko S. Hiraga, A. E. Hornschemeier, Akio Hoshino, John P. Hughes, Yuto Ichinohe, Ryo Iizuka, Hajime Inoue, Yoshiyuki Inoue, M. Ishida, Kumi Ishikawa, Yoshitaka Ishisaki, Masachika Iwai, J. S. Kaastra, T. R. Kallman, T. Kamae, J. Kataoka, Satoru Katsuda, N. Kawai, Richard L Kelley, Caroline A Kilbourne, Takao Kitaguchi, Shunji Kitamoto, Tetsu Kitayama, Takayoshi Kohmura, M. Kokubun, Katsuji Koyama, Shu Koyama, P. Kretschmar, H. Krimm, Aya Kubota, Hideyo Kunieda, Philippe Laurent, S.-H. Lee, Maurice A. Leutenegger, Olivier O Limousin, Michael Loewenstein, Knox S. Long, David H. Lumb, G. M. Madejski, Yoshitomo Maeda, Daniel Maier, Kazuo Makishima, Maxim Markevitch, Hironori Matsumoto, Kyoko Matsushita, D. McCammon, Brian R McNamara, M. Mehdipour, Eric D. Miller, J. M. Mïller, Shin Mineshige, Kazuhisa Mitsuda, Ikuyuki Mitsuishi, Takuya Miyazawa, Tsunefumi Mizuno, Hideyuki Mori, Koji Mori, K. Mukai, Hiroshi Murakami, R. F. Mushotzky, Takao Nakagawa, Hiroshi Nakajima, Takeshi Nakamori, Shinya Nakashima, K. Nakazawa, Kumiko K Nobukawa, Masayoshi Nobukawa, Hirofumi Noda, Hirokazu Odaka, Anna Ogorzałek, Takaya Ohashi, M. Ohno, Takashi Okajima, Naomi Ota, Masanobu Ozaki, F. Paerels, Stéphane Paltani, Robert Petre, C. Pinto, Frederick S Porter, K. Pottschmidt, C. S. Reynolds, Samar Safi‐Harb, Shinya Saito, Kazuhiro Sakai, Toru Sasaki, Goro Sato, Kosuke Sato, Rie Sato, Makoto Sawada, N. Schartel, Peter J Serlemtsos, Hiromi Seta, M. Shidatsu, A. Simionescu, Randall K Smith, Yang Soong, Ł. Stawarz, Y. Sugawara, Satoshi Sugita, Andrew E. Szymkowiak, H. Tajima, H. Takahashi, Tadayuki Takahashi, Shin’ichiro Takeda, Yoh Takei, Toru Tamagawa, Takayuki Tamura, T. Tanaka, Yasuo Tanaka, Yasuyuki T Tanaka, Makoto S Tashiro, Yuzuru Tawara, Y. Terada, Yuichi Terashima, Francesco Tombesi, Hiroshi Tomida, Y. Tsuboi, Masahiro Tsujimoto, H. Tsunemi, Takeshi Go Tsuru, Hiroyuki Uchida, Hideki Uchiyama, Y. Uchiyama, Shutaro Ueda, Yoshihiro Ueda, Shin’ichiro Uno, C. M. Urry, Eugenio Ursino, Shin Watanabe, Norbert Werner, D. R. Wilkins, Brian J Williams, S. Yamada, Hiroya Yamaguchi, K. Yamaoka, Noriko Y. Yamasaki, M. Yamauchi, Shigeo Yamauchi, Tahir Yaqoob, Yoichi Yatsu, Daisuke Yonetoku, Irina Zhuravleva, Abderahmen Zoghbi,

Atomic and Molecular Physics

Thanks to its high spectral resolution (~5 eV at 6 keV), the Soft X-ray Spectrometer (SXS) on board Hitomi enables us to measure the detailed structure of spatially resolved emission lines from highly ionized ions in galaxy clusters for the first time. In this series of papers, using the SXS we have measured the velocities of gas motions, metallicities and the multi-temperature structure of the gas in the core of the Perseus cluster. Here, we show that when inferring physical properties from line emissivities in systems like Perseus, the resonant scattering (RS) effect should be taken into account. In the Hitomi waveband, RS mostly affects the FeXXV He$α$ line ($w$) - the strongest line in the spectrum. The flux measured by Hitomi in this line is suppressed by a factor ~1.3 in the inner ~30 kpc, compared to predictions for an optically thin plasma; the suppression decreases with the distance from the center. The $w$ line also appears slightly broader than other lines from the same ion. The observed distortions of the $w$ line flux, shape and distance dependence are all consistent with the expected effect of the resonant scattering in the Perseus core. By measuring the ratio of fluxes in optically thick ($w$) and thin (FeXXV forbidden, He$β$, Ly$α$) lines, and comparing these ratios with predictions from Monte Carlo radiative transfer simulations, the velocities of gas motions have been obtained. The results are consistent with the direct measurements of gas velocities from line broadening described elsewhere in this series, although the systematic and statistical uncertainties remain significant. Further improvements in the predictions of line emissivities in plasma models, and deeper observations with future X-ray missions will enable RS measurements to provide powerful constraints on the amplitude and anisotropy of clusters gas motions.