Data processing, analysis, and model calculation for XRISM

JAXA Supercomputer System Annual Report February 2025-January 2026

Report Number: R25EDU10507

Subject Category: Space and Astronautical Science

Responsible Representative: Ken EBISAWA, Dapartment of Astrophysics, ISAS
Contact Information: Ken EBISAWA (ebisawa.ken@jaxa.jp)
Members: Nagi Atsuchi, Satoshi Eguchi, Ken Ebisawa, Kotaro Fukushima, Katsuhiro Hayashi, Yoshiaki Kanemaru, Miki Kurihara, Yuto Mochizuki, Daiki Miura, Yuya Nakatani, Shoji Ogawa, Naoto Sameshima, Masahiro Tsujimoto, Ryosuke Uematsu

Abstract

In the XRISM project, use JSS to re-process a large amout of XRISM low-level datasets to high-level science ready datasets when new calibration is made available. For individual XRISM users, carry out complex data analysis or simulation to interpret the observed data and compare with models.

Reference URL

N/A

Reasons and benefits of using JAXA Supercomputer System

In the XRISM project, when new calibration is required, large volumes of data can be reprocessed quickly, allowing the new, higher-order processed data to be distributed to users promptly. XRISM users can complete various model calculations and model fits in a short period of time, spend more time for comparing and analyzing the results.

Achievements of the Year

Demonstrated that JSS is effective for pipeline data processing of scientific satellites and for data analysis by individual researchers. In cases where a single FITS file generates a large number of small I/O operations (an area where LusterFS struggles) we significantly improved I/O performance by using a loopback device formatted with Singularity+ext3 (see Peer-Reviewed Paper 2).

Publications

- Peer-reviewed papers

(1)Mochizuki, et al. "Benchmark of the Fe XXV R ratio in photoionized plasma during eclipse of Centaurus X-3 with XRISM/Resolve", Publications of the Astronomical Society of Japan, Volume 77, Issue Supplement_1, pp S63–S71

(2) Eguchi, et al. "XRISM pre-pipeline and Singularity: container-based data processing for the X-ray imaging and spectroscopy mission and high-performance computing," Eguchi et al., Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 11, Issue 4, 042013 (August 2025)

(3)"IMPACTX: An X-Ray Spectral Model for Polar Dust and Clumpy Torus

K.Fujiwara, Y.Ueda, S.Ogawa, Y.Nakatani, R.Uematsu"

The Astrophysical Journal, 2026

(4) "Accurate determination of chemical abundances near a supermassive black hole"

The XRISM collaboration, Nature Astronomy, 2026

- Invited Presentations

(1) Ogawa, et al. " Accurate Determination of Chemical Abundances near a Supermassive Black Hole with XRISM", XRISM International Conference 2025, Kyoto Terrsa, Kyoto, Japan, October 20-24, 2025

- Oral Presentations

(1) Y. Nakatani, Cen A target team, "Nuclear structure in type-2 radio galaxy Centaurus A revealed by XRISM", 11th GALAXY EVOLUTION WORKSHOP, Nagoya University, Nagoya, Japan, August 25-29, 2025 (Oral)

- Poster Presentations

(1) Atsuchi et al. "Circumstellar Environment of Cir X-1 Revealed by XRISM Resolve Spectroscopy", XRISM Science Team Meeting #8, 2025/07/06-11, Leiden

(2) Atuchi, et al. "Variation of the photoionized plasma in Cir X-1 depicted by two simultaneous XRISM-NICER observations apart by one year", XRISM International conference 2025, 2025/10/20-24, Kyoto

(3) Y. Nakatani, Cen A target team, "Broadband Spectral Analysis of the Radio Galaxy Centaurus A", XRISM International Conference 2025, Kyoto, Japan, October 20-24, 2025

(4) Ogawa et al. "Origin of the continuum spectral variation of MCG-6-30-15",

XRISM International Conference 2025, Kyoto Terrsa, Kyoto, Japan, October 20-24, 2025

Usage of JSS

Computational Information

Process Parallelization Methods: N/A
Thread Parallelization Methods: N/A
Number of Processes: 1
Elapsed Time per Case: 24 Hour(s)

JSS3 Resources Used

Fraction of Usage in Total Resources*1(%): 0.63

Details

Please refer to System Configuration of JSS3 for the system configuration and major specifications of JSS3.

Computational Resources
System Name	CPU Resources Used (Core x Hours)	Fraction of Usage*2(%)
TOKI-SORA	0.00	0.00
TOKI-ST	5526844.47	5.72
TOKI-GP	0.00	0.00
TOKI-XM	0.00	0.00
TOKI-LM	0.00	0.00
TOKI-TST	0.00	0.00
TOKI-TGP	0.00	0.00
TOKI-TLM	0.00	0.00

File System Resources
File System Name	Storage Assigned (GiB)	Fraction of Usage*2(%)
/home	1024.00	1.64
/data and /data2	102400.00	0.67
/ssd	30720.00	1.87

Archiver Resources
Archiver Name	Storage Used (TiB)	Fraction of Usage*2(%)
J-SPACE	8.71	0.03

*1: Fraction of Usage in Total Resources: Weighted average of three resource types (Computing, File System, and Archiver).

*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.

ISV Software Licenses Used

ISV Software Licenses Resources
	ISV Software Licenses Used (Hours)	Fraction of Usage*2(%)
ISV Software Licenses (Total)	0.00	0.00

*2: Fraction of Usage：Percentage of usage relative to each resource used in one year.