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

Journal Article · · Journal of Astronomical Telescopes, Instruments, and Systems
 [1];  [2];  [3];  [4];  [5];  [2];  [3];  [6];  [3];  [7];  [8];  [8]
  1. Univ. of Tokyo (Japan); Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan). Institute of Space and Astronautical Science
  2. Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan). Institute of Space and Astronautical Science
  3. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  4. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  5. Tokyo Metropolitan University (Japan)
  6. Univ. of Teacher Education Fukuoka (Japan)
  7. International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles, Ibaraki (Japan)
  8. Rikkyo University, Tokyo (Japan)
+ Show Author Affiliations
The X-Ray Imaging and Spectroscopy Mission (XRISM) satellite was successfully launched and put into a 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 non-dispersive spectroscopy over a wide energy range. It also excels in a low background with a requirement of < 2 × 10-3s-1 keV-1 (0.3 to 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 data sets recorded on the ground and in orbit based on the heritage of the preceding X-ray microcalorimeter missions, in particular, the Soft X-ray Spectrometer 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 × 10-3s-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 to 12 keV, the background rate becomes 1.0 × 10-3s-1 keV-1.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
Japan Science and Technology Agency (JST); Japan Society for the Promotion of Science (JSPS); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
2556953
Report Number(s):
LLNL--JRNL-871732; 1109595
Journal Information:
Journal of Astronomical Telescopes, Instruments, and Systems, Journal Name: Journal of Astronomical Telescopes, Instruments, and Systems Journal Issue: 04 Vol. 11; ISSN 2329-4124
Publisher:
SPIECopyright Statement
Country of Publication:
United States
Language:
English

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Optimization of x-ray event screening using ground and in-orbit data for the Resolve instrument onboard the XRISM satellite conference August 2024
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Figures / Tables (13)

Table 1(p. 7)table Table 1
Fig. 1(p. 8)figure Fig. 1
Fig. 2(p. 8)figure Fig. 2
Fig. 3(p. 9)figure Fig. 3
Fig. 4(p. 9)figure Fig. 4
Table 2(p. 10)table Table 2
Fig. 5(p. 11)figure Fig. 5
Fig. 6(p. 12)figure Fig. 6
Fig. 7(p. 13)figure Fig. 7
Table 3(p. 14)table Table 3
Fig. 8(p. 15)figure Fig. 8
Fig. 9(p. 15)figure Fig. 9
Table 4(p. 16)table Table 4

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