Study of the Galactic Diffuse X-ray Emission

• Project/Area Number: 24540232
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Astronomy
• Research Institution: Nara Women's University
• Principal Investigator: YAMAUCHI SHIGEO 奈良女子大学, 自然科学系, 教授 (60260410)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
• Keywords: X線 / 銀河面X線放射 / X線スペクトル

Outline of Final Research Achievements

In order to investigate the origin of the Galactic diffuse X-ray emission (GDXE), we carried out a systematic study of iron K-shell lines in the Galaxy. Using intensities of three emission lines at 6.4, 6.7 and 6.97 keV, we determined the spatial distribution and equivalent width of each line for the first time. Comparing the spatial distributions and equivalent widths with those of the cataclysmic variables and flare stars, we discussed the origin of the GDXE. We found similar diffuse X-ray emission with an intense iron K-shell line in the spiral galaxy M101. We analyzed the data of supernova remnants and extended sources in the Galaxy and obtained new results of the X-ray emission.

Research Products

• [Journal Article] Iron emission line from the spiral galaxy M101 (2016)
  • Author(s): Yamauchi, S.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 68 Issue: SP1
  • DOI: 10.1093/pasj/psv107
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Suzaku observations of two diffuse hard X-ray source regions, G22.0+0.0 and G23.5+0.1 (2016)
  • Author(s): Yamauchi, S., Sumita, M., Bamba, A.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 68 Issue: SP1
  • DOI: 10.1093/pasj/psv109
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Scale heights and equivalent widths of the iron K-shell lines in the Galactic diffuse X-ray emission (2016)
  • Author(s): Yamauchi, S., Nobukawa, K. K., Nobukawa, M., Uchiyama, H., Koyama, K.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 68 Issue: 4 Pages: 59-59
  • DOI: 10.1093/pasj/psw057
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] X-ray filament with a strong 6.7-keV line in the Galactic center region (2014)
  • Author(s): Yamauchi, S., Shimizu, M., Nakashima, S., Nobukawa, M., Tsuru, T. G., Koyama, K.
  • Journal Title: Publications of Astronomical Society of Japan Volume: 66 Issue: 6 Pages: 1256-1256
  • DOI: 10.1093/pasj/psu122
  • NAID: 40020355876
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Thermal and non-thermal X-rays from the Galactic supernova remnant G348.5+0.1 (2014)
  • Author(s): Yamauchi, Shigeo; Minami, Sari; Ota, Naomi; Koyama, Katsuji
  • Journal Title: PASJ Volume: 66 Issue: 1
  • DOI: 10.1093/pasj/pst004
  • Peer Reviewed
• [Journal Article] X-Ray Observation of the Galactic Supernova Remnant G355.6-0.0 with Suzaku (2013)
  • Author(s): Minami, S., Ota, N., Yamauchi, S., Koyama, K
  • Journal Title: Publications of Astronomical Society of Japan Volume: 65
  • NAID: 40020043281
  • Peer Reviewed
• [Journal Article] X-ray emission from the galactic supernova remnant G12.0-0.1 (2013)
  • Author(s): Yamauchi, Shigeo; Bamba, Aya; Koyama, Katsuji
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 66 Issue: 1 Pages: 20-20
  • DOI: 10.1093/pasj/pst021
  • Peer Reviewed
• [Journal Article] Evidence for Recombining Plasma in the Supernova Remnant G346.6-0.2 (2013)
  • Author(s): Yamauchi, S., Nobukawa, M., Koyama, K., Yonemori, M.
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 65
  • NAID: 40020042675
  • Peer Reviewed
• [Presentation] 銀河リッジX線放射の中性鉄輝線における宇宙線の寄与 (2016)
  • Author(s): 信川久実子,山内茂雄,信川正順,鶴剛,小山勝二,鳥居和史,福井康雄
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 首都大学東京
  • Year and Date: 2016-03-14
• [Presentation] すざく衛星による渦巻銀河M101の観測 (2015)
  • Author(s): 山内茂雄
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 甲南大学
  • Year and Date: 2015-09-09
• [Presentation] 銀河リッジ X 線放射の 6.4 keV 輝線 (2015)
  • Author(s): 信川久実子,信川正順,鶴剛,小山勝二,山内茂雄
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 甲南大学
  • Year and Date: 2015-09-09
• [Presentation] Mixed-Morphology型超新星残骸Kes27のプラズマの電離状態について (2014)
  • Author(s): 南沙里、山内茂雄、小山勝二
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 国際基督教大学
• [Presentation] 超新星残骸G348.5+0.1のX線放射について (2013)
  • Author(s): 山内茂雄、南沙里、太田直美、小山勝二
  • Organizer: 日本天文学会秋季年会
  • Place of Presentation: 東北大学
• [Presentation] 超新星残骸G346.6-0.2からの再結合優勢プラズマの発見 (2013)
  • Author(s): 山内茂雄, 信川正順, 小山勝二, 米森愛美
  • Organizer: 日本天文学会2013年春季年会
  • Place of Presentation: 埼玉大学
• [Presentation] 過電離プラズマモデルを用いた超新星残骸W49Bのスペクトル解析 (2013)
  • Author(s): 南 沙里, 太田 直美, 山内 茂雄, 小山 勝二
  • Organizer: 日本天文学会2013年春季年会
  • Place of Presentation: 埼玉大学