X-ray Astronomy Recovery Mission (XARM) Participating Scientists (ROSES 2017)

Funding Agency:
National Aeronautics and Space Administration

NASA and JAXA have jointly agreed to participate in the X-ray Astronomy Recovery Mission (XARM), in order to restore the soft X-ray spectroscopic capability lost with the Hitomi mission in March 2016. The key scientific objective of XARM is to "Pioneer a new horizon of the Universe with unprecedented high-resolution X-ray spectroscopy." This objective is addressed in the following aspects: • Structure formation of the Universe and evolution of clusters of galaxies. • Circulation history of baryonic matter in the Universe. • Transport and circulation of energy in the Universe.

XARM has two complementary instruments. The instruments will be functionally identical to the Hitomi Soft X-ray Spectrometer (SXS) and Soft X-ray Imager (SXI). A brief description of these instruments can be found in Takahashi et al. Proc. SPIE 99050U (2016).

XARM is planned to launch in Japanese Fiscal Year 2020, which ends in March 2021. After an initial activation and calibration phase, the first six to nine months of XARM observations will consist of the Performance Verification (PV) phase, in which a set of high-value scientific targets will be observed, as determined by the XARM Science Team. After the PV phase, most observations will be selected competitively through an international General Observer program. All data will reside in a public archive after expiration of any exclusive use period.


  • Step-1 Proposal: Oct. 24, 2017
  • Step-2 Proposal: Dec. 13, 2017

Agency Website

Funding Type





Engineering and Physical Sciences
Environmental & Life Sciences

External Deadline

October 24, 2017