The Quiescent Intracluster Medium in the Core of the Perseus Cluster Observed with Hitomi

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  • X線天文衛星「ひとみ」が見た意外と静かなペルセウス座銀河団中心の高温ガス
  • 最近の研究から X線天文衛星「ひとみ」が見た意外と静かなペルセウス座銀河団中心の高温ガス
  • サイキン ノ ケンキュウ カラ Xセン テンモン エイセイ 「 ヒトミ 」 ガ ミタ イガイ ト シズカ ナ ペルセウスザギンガダン チュウシン ノ コウオン ガス

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Description

<p>X-ray astronomy satellite Hitomi is briefly described. Results of the measurement of the hot-gas velocity in the Perseus cluster of galaxies are reported. The observed turbulent velocity (164±10 km s-1 in the line of sight) infers that the turbulent pressure is only 4% of the thermodynamic one, and a velocity shear of 150±70 km s-1 over a scale of 200, 000 ly is also observed. The total mass of clusters based on hydrostatic equilibrium would require little correction for turbulent pressure. Even the satellite lost its function in about a month in the orbit, the result shows the power of microcalorimeters and the importance of high-resolution spectroscopy in future X-ray observations.</p>

Journal

  • Butsuri

    Butsuri 72 (7), 503-508, 2017-07-05

    The Physical Society of Japan

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