Optimization of x-ray event screening using ground and in-orbit data for the Resolve instrument onboard the XRISM satellite

Yuto Mochizuki; Masahiro Tsujimoto; Caroline A. Kilbourne; Megan E. Eckart; Yoshitaka Ishisaki; Yoshiaki Kanemaru; Maurice A. Leutenegger; Misaki Mizumoto; Frederick S. Porter; Kosuke Sato; Makoto Sawada; Shinya Yamada

doi:10.1117/12.3019453

21 August 2024 Optimization of x-ray event screening using ground and in-orbit data for the Resolve instrument onboard the XRISM satellite

Yuto Mochizuki, Masahiro Tsujimoto, Caroline A. Kilbourne, Megan E. Eckart, Yoshitaka Ishisaki, Yoshiaki Kanemaru, Maurice A. Leutenegger, Misaki Mizumoto, Frederick S. Porter, Kosuke Sato, Makoto Sawada, Shinya Yamada

Author Affiliations +

Proceedings Volume 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray; 1309363 (2024) https://doi.org/10.1117/12.3019453
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

The XRISM (X-Ray Imaging and Spectroscopy Mission) satellite was successfully launched and put into low- Earth orbit on September 6, 2023 (UT). The Resolve instrument onboard XRISM hosts an x-ray microcalorimeter detector, which was designed to achieve a high-resolution (≤7 eV FWHM at 6 keV), high-throughput, and nondispersive spectroscopy over a wide energy range. It also excels in a low background with a requirement of < 2 × 10⁻³ s⁻¹ keV⁻¹ (0.3–12.0 keV), which is equivalent to only one background event per spectral bin per 100 ks exposure. Event screening to discriminate x-ray events from background is a key to meeting the requirement. We present the result of the Resolve event screening using the data sets on the ground and in the orbit based on the heritage of the preceding x-ray microcalorimeter missions, in particular, the Soft X-ray Spectrometer (SXS) onboard ASTRO-H. We optimize and evaluate 19 screening items of three types based on (1) the event pulse shape, (2) relative arrival times among multiple events, and (3) good time intervals. We show that the initial screening, which is applied for science data products in the performance verification phase, reduces the background rate to 1.8×10⁻³ s⁻¹ keV⁻¹ meeting the requirement. We further evaluate the additional screening utilizing the correlation among some pulse shape properties of x-ray events and show that it further reduces the background rate particularly in the <2 keV band. Over 0.3–12 keV, the background rate becomes 1.0 × 10⁻³ s⁻¹ keV⁻¹.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Yuto Mochizuki, Masahiro Tsujimoto, Caroline A. Kilbourne, Megan E. Eckart, Yoshitaka Ishisaki, Yoshiaki Kanemaru, Maurice A. Leutenegger, Misaki Mizumoto, Frederick S. Porter, Kosuke Sato, Makoto Sawada, and Shinya Yamada "Optimization of x-ray event screening using ground and in-orbit data for the Resolve instrument onboard the XRISM satellite", Proc. SPIE 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 1309363 (21 August 2024); https://doi.org/10.1117/12.3019453

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