Centers & Labs

Global Research Cluster


Team Leader: Kazuo Makishima (D.Sci.)
Kazuo  Makishima(D.Sci.)

In collaboration with JAXA and other institutions, we conduct high-energy astrophysics observations using MAXI (Monitor of All-sky X-ray Image) onboard the International Space Station (ISS). Since the MAXI operation started in 2009, we have detected long-term changes and/or emergence of high-energy sources, including black holes, neutron stars, gamma-ray bursts, and flaring stars. We issued prompt worldwide alerts of these events, and publicly released the MAXI data. The operation of MAXI is approved till the end of 2018 March, and its importance is enhanced by the detection of Gravitational Waves and the launch of the X-ray satellite Hitomi. We also plan to collaborate with the NICER experiment of the USA, soon to be onboard the ISS.

Main Research Field

Space Science

Related Research Fields

Physics / Geosciences

Research Subjects

  • Operation and data release of the MAXI mission onboard the International Space Station
  • All-sky monitoring for X-ray transients and studies of time variations of cosmic X-ray sources
  • Collaborations with related astrophysical observatories

Selected Publications

  1. Takagi, T., Mihara, T., Sugizaki, M., Makishima, K. & Morii, M.:
    "Application of the Ghosh & Lamb relation to the spin-up/down behavior in the X-ray binary pulsar 4U 1626-67"
    Publ. Astr. Soc. Japan 68, in press (2016)
  2. Sugimoto, J., Mihara, T., Kitamoto, S., Matsuoka, M., Sugizaki, M., Negoro, H., Nakahira, S. & Makishima, K.:
    "MAXI observations of long-term variations of Cygnus X-1 in the low/hard and the high/soft states"
    Publ. Astr. Soc. Japan 68, in press (2016)
  3. Kimura, M., Isogai, K., Kato, T., Ueda, Y., Nakahira, S., Shidatsu, M., Enoto, T. et al.:
    "Repetitive patterns in rapid optical variations in the nearby black-hole binary V404 Cygni"
    Nature 529, 54 (2016)
  4. Rodes-Roca, J., Mihara, T., Nakahira, S., Torrejón, J. M., Giménez-García, Á. & Bernabéu, G.:
    "Orbital phase-resolved spectroscopy of 4U 1538-52 with MAXI"
    Astronomy & Astrophysics 580, id.A140 (2015)
  5. Asai, K., Mihara, T., Matsuoka, M. & Sugizaki, M.:
    "X-ray variability with spectral state transitions in NS-LMXBs observed with MAXI/GSC and Swift/BAT"
    Publ. Astron. Soc. Japan 67, Article 92 (2015)
  6. Sugizaki, M., Yamamoto, T., Mihara, T., Nakajima, M., & Makishima, K.:
    "Luminosity and spin-period evolution of GX 304-1 during outbursts from 2009 to 2013 observed with the MAXI/GSC, RXTE/PCA, and Fermi/GBM"
    Publ. Astron. Soc. Japan 67, Article 73 (2015)
  7. Serino, M., Shidatsu, M., Ueda, Y., Matsuoka, M., Negoro, H., Yamaoka, K., Kennea, J. A., Fukushima, K. & Nagayama, T.:
    "Low-mass X-ray binary MAXI J1421-613 observed by MAXI GSC and Swift XRT"
    Publ. Astron. Soc. Japan 67, Article 30 (2015)
  8. Morii, M., Tomida, H., Kimura, M., Suwa, F., Negoro, H., Serino, M., Kennea, J. A., et al.:
    "Extraordinary Luminous Soft X-Ray Transient MAXI J0158–744 as an Ignition of a Nova on a Very Massive O-Ne White Dwarf"
    Astrophys. J. 779, Article 118 (2013)
  9. Mihara, T., Nakajima, M., Sugizaki, M., Serino, M., Matsuoka, M., Kohama, M. et al.:
    "Gas Slit Camera (GSC) onboard MAXI on ISS"
    Publ. Astron. Soc. Japan 63S, 623 (2011)
  10. Matsuoka, M., et al.:
    "The MAXI Mission on the ISS: Science and Instruments for Monitoring All-Sky X-Ray Images"
    Publ. Astron. Soc. Japan 61, 999 (2009)

Lab Members

Principal Investigator

Kazuo Makishima
Team Leader

Core Members

Tatehiro Mihara
Senior Research Scientist
Mutsumi Sugizaki
Research Scientist
Motoko Serino
Research Scientist
Wataru Iwakiri
Special Postdoctoral Researcher
Megumi Shidatsu
Special Postdoctoral Researcher
Juri Sugimoto
Junior Research Associate
Toshihiro Takagi
Junior Research Associate
Eva Laplace
International Program Associate
Masayuki Sudo
Student Trainee
Aya Kumagai
Student Trainee
Yusuke Takao
Student Trainee
Fumiaki Yatabe
Student Trainee
Yuho Matsuzuki
Student Trainee
Kazumi Asai
Part-time Worker

Contact information

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

Email: maxima [at]

Related links

Recent research results

April 7, 2017: RIKEN RESEARCH
Binary star caught in violent cycle
March 24, 2017: RIKEN RESEARCH
Solving the case of the missing x-rays