Centers & Labs

RIKEN Nishina Center for Accelerator-Based Science

High Energy Astrophysics Laboratory

Associate Chief Scientist: Toru Tamagawa (D.Sci.)
Toru  Tamagawa(D.Sci.)

In the immediate aftermath of the Big Bang, the beginning of the universe, only hydrogen and helium existed. However, nuclear fusion in the interior of stars and the explosion of supernovae in the universe over the course of 13.7 billion years led to the evolution of a world brimming with the many different elements we have today. By using man-made satellites to observe X-rays and gamma rays emitted from celestial bodies, we are observing the creation of the elements at their actual source. Our goal is to comprehensively elucidate the scenarios for the formation of the elements in the universe, together with our research on atomic nuclei through the use of an accelerator.

Research Subjects

  • Nucleosynthesis in Supernovae
  • Particle Acceleration Mechanism in Astronomical Objects
  • Physics in Extremely Strong Magnetism and Gravity
  • Research and Development of Innovative X-ray and Gamma-ray detectors

Selected Publications

  1. Hayato, A., et al.,:
    "Expansion Velocity of Ejecta in Tycho's Supernova Remnant Measured by Doppler Broadened X-ray Line Emission"
    The Astrophysical Journal, Volume 725, Issue 1, pp. 894-903 (2010)
  2. Konami, S., Matsushita, K., Nagino, R., Tashiro, M. S., Tamagawa, T., Makishima, K.:
    "Abundance Patterns in the Interstellar Medium of the S0 Galaxy NGC 1316 (Fornax A) Revealed with Suzaku"
    Publications of the Astronomical Society of Japan, Vol.62, No.6, pp.1435-1443 (2010)
  3. Tamagawa, T., et al.:
    "Development of thick-foil and fine-pitch GEMs with a laser etching technique"
    Nuclear Instruments and Methods in Physics Research Section A, Volume 608, Issue 3, p. 390-396 (2009)
  4. Tamagawa, T., et al.:
    "Suzaku Observations of Tycho's Supernova Remnant"
    Publicatios of the Astronomical Society of Japan, Vol.61, No.SP1, pp.S167-S174 (2009)
  5. Hiraga, J. S., Kobayashi, Y., Tamagawa, T., Hayato, A., Bamba, A., Terada, Y., Petre, R., Katagiri, H., Tsunemi, H.:
    "Search for Sc-K Line Emission from RX J0852.0-4622 Supernova Remnant with Suzaku"
    Publications of the Astronomical Society of Japan, Vol.61, No.2, pp.275-281 (2009)
  6. Furuzawa, A., et al.:
    "Doppler-Broadened Iron X-Ray Lines From Tycho's Supernova Remnant"
    The Astrophysical Journal Letters, Volume 693, Issue 2, pp. L61-L65 (2009)
  7. Misawa, T., Gandhi, P., Hida, A., Tamagawa, T., Yamaguchi, T.:
    "Identification of New Near-Infrared Diffuse Interstellar Bands in the Orion Nebula"
    The Astrophysical Journal, Volume 700, Issue 2, pp. 1988-1993 (2009)
  8. Tamura, T., Maeda, Y., Mitsuda, K., Fabian, A. C., Sanders, J. S., Furuzawa, A., Hughes, J. P., Iizuka, R,; Matsushita, K., Tamagawa, T.:
    "X-ray Spectroscopy of the Core of the Perseus Cluster with Suzaku: Elemental Abundances in the Intracluster Medium"
    The Astrophysical Journal Letters, Volume 705, Issue 1, pp. L62-L66 (2009)
  9. Nakagawa, Y. E., et al.:
    "A Comprehensive Study of Short Bursts from SGR1806-20 and SGR1900+14 Detected by HETE-2"
    Publications of the Astronomical Society of Japan, Vol.59, No.3, pp.653-678 (2007)

Lab Members

Principal Investigator

Toru Tamagawa
Associate Chief Scientist

Core Members

Asami Hayato
Special Postdoctoral Researcher
Satoru Katsuda
Special Postdoctoral Researcher
Shinya Yamada
Special Postdoctoral Researcher
Kumi Ishikawa
Special Postdoctoral Researcher
Takao Kitaguchi
Postdoctoral Researcher
Goro Sato
Contract Researcher
Teruaki Enoto
Visiting Researcher

Contact information

2-1 Hirosawa,
Wako, Saitama
351-0198, Japan

Email: tamagawa [at] riken.jp