4th Kyoto University-Inamori Foundation Joint Kyoto Prize Symposium
July 1-2, 2017
Theme “Windows to the Future” - Looking Through the Eyes of Bio/Medical Technology, Mathematics, and Art - (Finished)

Katsuji Koyama
Earth and Planetary Sciences, Astronomy and Astrophysics

Katsuji Koyama

Professor Emeritus, Kyoto University
・X-ray astronomy
・Cosmic ray physics

Title of Presentation

“X-Ray Study of a Kyoto Millennium Supernova”

The shock wave of a supernova (SN) explosion makes an X-ray bright expanding plasma. The X-ray observation of the plasma reveals that (1) the origin of the Cosmic Rays (CRs), high energy particles of the Universe, is SN. The acceleration mechanisms of the CR are also revealed to be a diffusive shock acceleration (DSA), a subclass of the Fermi acceleration. (2) The X-ray spectrum reveals that the SN is type Ia, a standard candle to measure the distance scale of the Universe, and quantitatively determines the heavy elements synthesized in a star and in the SN. (3) The X-ray morphology of the Ia SN finds non spherical explosion .

This talk reviews the three subjects in detail. The SN used in this study is that occurred in the last millennium, the Heian era, which was noted in the Meigetsuki, a diary of a court poet, Fujiwara Teika.

Presentation Movie


Web Site URL
A brief Biography
Born in 1945
1968-1975 Doctor course, Faculty of Science, Kyoto University and PD Fellow; Research of Nuclear Physics
1975-1987 Instructor, Institute of Space and Aeronautical Science, University of Tokyo
1987-1988 Associate Professor, Institute of Space and Astronautical Science
1988-1991 Associate Professor, Nagoya University
1991-2008 Professor, Kyoto University; Research of X-ray Astronomy
Details of selected Awards and Honors
A list of selected Publications

Thermal X-ray emission with intense 6.7-keV iron line from the Galactic ridge, Koyama, K. et al. 1986, PASJ, 38, 121

An intense iron line emission from NGC 1068, Koyama, K. et al. 1986, PASJ, 41, 731

Intense 6.7-keV iron line emission from the Galactic Centre, Koyama et al. 1995, Nature 339, 603

Evidence for shock acceleration of high-energy electrons in the supernova remnant SN1006, Koyama et al. 1995, Nature 378, 255

Discovery of Hard X-Rays from a Cluster of Proto-stars, Koyama, K. et al. 1996, PASJ, 48, 87

ASCA View of Our Galactic Center: Remains of Past Activities in X-Rays?, Koyama, K. et al. 1996, PASJ, 48, 249

Discovery of Non-Thermal X-Rays from the Northwest Shell of the New SNR RX J1713.7-3946: The Second SN 1006?, Koyama, K. et al. 1997, PASJ, 49, 7

X-Ray Imaging Spectrometer (XIS) on Board Suzaku, Koyama, K. et al.2007, PASJ, 59, 23

Iron and Nickel Line Diagnostics for the Galactic Center Diffuse Emission, Koyama, K. et al. 2007, PASJ, 59, 245