Exploring the new frontier of X-ray imaging spectroscopy employing CMOS image sensor

• Project/Area Number: 25870181
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Astronomy; Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Kwansei Gakuin University (2015); The University of Tokyo (2013-2014)
• Principal Investigator: HIRAGA JUNKO 関西学院大学, 理工学部, 准教授 (00446527)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: X線 / 撮像分光器 / CMOSイメージセンサ / 撮像分光検出器 / フォトンカウンティング / CMOSイメージセンサー / CCD / スペクトル

Outline of Final Research Achievements

we used an Andor-Zyla CMOS camera. A size of the detector is 16.4x14.0 mm2, the number of pixel is 2540x2140 and each pixel size is 6.5x6.5 um squire . For X-ray detector, we examined three points, a noise level,splitting of single events and a performance of spectra. We irradiated X-ray as Fe for 50 s in room temperture (~25degrees). First, the noise level (RMS) is very low ~3e-. Second, we checked the expansion of charge for one photon event. In single events, the charges are diffused to immediate pixels. From our measurement, we analyzed that the charges diffused ~0.75 pixel (~5 um) and knew many charges ran out to other pixels. Third, to we obtained the spectra, we analyzed each single X-ray photon event. We could create spectra of manganese fluorescence lines and their energy resolution is ~290 eV in FWHM.

Research Products

• [Journal Article] Evidence for Thermal X-Ray Line Emission from the Synchrotron-dominated Supernova Remnant RX J1713.7-3946 (2015)
  • Author(s): Katsuda, Satoru; Acero, Fabio; Tominaga, Nozomu; Fukui, Yasuo; Hiraga, Junko S.; Koyama, Katsuji; Lee, Shiu-Hang; Mori, Koji; Nagataki, Shigehiro; Ohira, Yutaka; and 7 coauthors
  • Journal Title: ApJ Volume: 814 Issue: 1 Pages: 1-11
  • DOI: 10.1088/0004-637x/814/1/29
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Suzaku X-Ray Observations of the Fermi Bubbles : Northernmost Cap and Southeast Claw Discovered With MAXI-SSC (2015)
  • Author(s): Tahara, M.; Kataoka, J.; Takeuchi, Y.; Totani, T.; Sofue, Y.; Hiraga, J.S.; Tsunemi, H.; Inoue, Y.; Kimura, M.; Cheung, C.C.; Nakashima, S.
  • Journal Title: The Astrophysical Journal Volume: 802-2 Issue: 2 Pages: 91-103
  • DOI: 10.1088/0004-637x/802/2/91
  • Peer Reviewed
• [Journal Article] Suzaku observations of the old pulsar wind nebula candidate HESS J1356-645 (2015)
  • Author(s): M. Izawa, T. Dotani, T. Fujinaga, A. Bamba, M. Ozaki, J.S. Hiraga
  • Journal Title: Publications of the Astronomical Society of Japan Volume: 67 Issue: 3 Pages: 43-43
  • DOI: 10.1093/pasj/psv013
  • Peer Reviewed
• [Presentation] X-ray photon detection with a newly developed CMOS image sensor (2013)
  • Author(s): Makoto Sasano
  • Organizer: The 12th Symposyum on X-ray Imaging Optics
  • Place of Presentation: Osaka University