Feasibility Study of a Direct Measurement of Dark Matter Distribution in Galaxy-Clusters

• Project/Area Number: 25400237
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Rikkyo University
• Principal Investigator: KITAMOTO Shunji 立教大学, 理学部, 教授 (70177872)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 銀河団 / ダークマター / マイクロカロリメータ / 重力赤方偏移 / 暗黒物質 / ASTRO-H / SXS / マイクロカロリメーター / 超高分散分光 / マイクロカロリメター

Outline of Final Research Achievements

The soft X-ray spectrometer (SXS) on board ASTRO-H, which had been launched on 17 Feb. 2016, opened a new research field with its extremely high energy-resolution for diffuse extended celestial objects. In this work, we investigated a completely new method for estimation of dark-matter distribution in galaxy-clusters, which is a measurement of the spatial distribution of gravitational red shift, by computer simulations with a realistic response function of the SXS. We concluded that a reasonable observation could make the new method to be possible. Also, we took part in the pre-flight function test and the calibration of the SXS. We confirmed that SXS achieved the high energy-resolution less than 5eV (FWHM) in flight operation.

Research Products

• [Journal Article] MAXI observations of long-term variations of Cygnus X-1 in the low/hard and the high/soft states (2016)
  • Author(s): Sugimoto, Juri; Mihara, Tatehiro; Kitamoto, Shunji; Mstsuoka, Masaru; Sugizaki, Mutsumi; Negoro, Hitoshi; Nakahira, Satoshi; Makishima, Kazuo
  • Journal Title: PASJ Volume: 68
  • Peer Reviewed
• [Journal Article] New multiwavelength observations of the Of?p star CPD -28° 2561 (2015)
  • Author(s): Hubrig, S.; Scholler, M.; Kholtygin, A. F.; Tsumura, H.; Hoshino, A.; Kitamoto, S.; Oskinova, L.; Ignace, R.; Todt, H.; Ilyin, I.
  • Journal Title: MNRAS Volume: 447 Issue: 2 Pages: 1885-1894
  • DOI: 10.1093/mnras/stu2516
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] X-ray Development of the Classical Nova V2672 Ophiuchi with Suzaku (2014)
  • Author(s): Takei, D., Tsujimoto, M., Drake, J. J., Kitamoto, S.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 66 Issue: 2 Pages: 37-37
  • DOI: 10.1093/pasj/psu019
  • NAID: 40020090917
  • Peer Reviewed / Open Access
• [Journal Article] X-Ray Eclipse Diagnosis of the Evolving Mass Loss in the Recurrent Nova U Scorpii 2010 (2013)
  • Author(s): Takei, D.; Drake, J. J.; Tsujimoto, M.; Ness, J.-U.; Osborne, J. P.; Starrfield, S.; Kitamoto, S.
  • Journal Title: The Astrophysical Journal Volume: 769 Issue: 1 Pages: L4-L4
  • DOI: 10.1088/2041-8205/769/1/l4
  • Peer Reviewed
• [Presentation] 銀河団の高エネルギー分光観測における重力赤方偏移の影響 (2014)
  • Author(s): 北本俊二、津村大樹、林祐
  • Organizer: 日本天文学会、2014年度秋季年会
  • Place of Presentation: 山形大学（山形市、山形県）
  • Year and Date: 2014-09-11 – 2014-09-13
• [Presentation] Effect of Gravitational redshift in Perseus Cluster (2013)
  • Author(s): Hayashi, T and Kitamoto, S.
  • Organizer: The 4th ASTRO-H Summer School
  • Place of Presentation: Shuzenji, Shizuoka, Japan