Ground calibration of the x-ray mirror assembly for the X-Ray Imaging and Spectroscopy Mission (XRISM) III-performance variation across the aperture

We present a summary of the ground calibration of the X-ray Mirror Assemblies (XMAs) for the XRISM satellite, that has been performed at the X-ray beamline at NASA's Goddard Space Flight Center. We used a scan method with a narrow X-ray pencil beam to calibrate both Resolve and Xtend XMAs, at eight different energies. In this paper, we give an overview of the measurement setup, and show the resulting on-axis and off-axis effective area response. Results of imaging performance, stray light, and performance variation across the aperture will be presented in separate publications.

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“…15 Performance variation across the aperture, measured with spot scans, will be presented in detail in another presentation. 16…”

Section: Ground Calibration Timelinementioning

confidence: 99%

“…Other measurements and results (imaging performance, stray light measurements, performance verification across the aperture) will be presented in separate publications. 15,16…”

Section: Introductionmentioning

confidence: 99%

Ground calibration of the x-ray mirror assembly for the x-ray imaging and spectroscopy mission (XRISM) I-measurement setup and effective area

Boissay-Malaquin

Hayashi

Tamura

et al. 2022

Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray

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“…The calibration studies of the XMA are presented elsewhere. [17][18][19] CCD spectra shown below are all made with grade 0, 2, 3, 4, and 6 events unless otherwise indicated. The confidence level of uncertainties attached is 68% throughout this paper.…”

Section: Introductionmentioning

confidence: 99%

Xtend, the soft x-ray imaging telescope for the x-ray imaging and spectroscopy mission (XRISM)

Mori

Tomida

Nakajima

et al. 2022

Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray

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Xtend is a soft X-ray imaging telescope developed for the X-Ray Imaging and Spectroscopy Mission (XRISM). XRISM is scheduled to be launched in the Japanese fiscal year 2022. Xtend consists of the Soft X-ray Imager (SXI), an X-ray CCD camera, and the X-ray Mirror Assembly (XMA), a thin-foil-nested conically approximated Wolter-I optics. The SXI uses the P-channel, back-illuminated type CCD with an imaging area size of 31 mm on a side. The four CCD chips are arranged in a 2×2 grid and can be cooled down to −120 • C with a single-stage Stirling cooler. The XMA nests thin aluminum foils coated with gold in a confocal way with an outer diameter of 45 cm. A pre-collimator is installed in front of the X-ray mirror for the reduction of the stray light. Combining the SXI and XMA with a focal length of 5.6m, a field of view of 38 × 38 over the energy range from 0.4 to 13 keV is realized. We have completed the fabrication of the flight model of both SXI and XMA. The performance verification has been successfully conducted in a series of sub-system level tests. We also carried out on-ground calibration measurements and the data analysis is ongoing.

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In-orbit performance of the Xtend-XMA onboard XRISM

Tamura,

Hayashi,

Boissay-Malaquin

et al. 2024

Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray

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XRISM (X-ray Imaging and Spectroscopy Mission) is an X-ray astronomy satellite developed in collaboration with JAXA, NASA and ESA. It successfully launched on Sept. 7, 2023. Two complementary X-ray telescopes, Resolve and Xtend are on-board XRISM. Resolve uses the pixelized X-ray micro calorimeter developed by NASA/GSFC and has very high energy resolution of 5 eV. On the other hand, Xtend uses an X-ray CCD camera as its focal plane detector which has high spatial resolution and a wide field of view. We evaluated the performance of the X-ray Mirror Assembly (XMA) for Xtend using data observed during the commissioning and PV phases of XRISM. To verify the imaging performance, the Point Spread Functions (PSF) generated from the observations of NGC 4151 and PDS 456 were compared with the ground-calibration results. The results show that the imaging performance of Xtend-XMA is not significantly different from that of the ground calibration, and that it meet the requirement. The effective area was verified by comparing the results of simultaneous observations of 3C 273 by XRISM and four X-ray astronomy satellites (Chandra, XMM-Newton, NuSTAR, and Swift). The results of the fitting of the X-ray spectrum of Xtend show no significant difference from the results of other satellites, suggesting the effective area used for fitting is correct. The on-axis position on the detector was estimated from the intensity of the Abell 2029 observations at four off-axis angles. The on-axis is about 40 arcsec away from the aim point, and the decrease in effective area at the aim point is less than 1%. Stray light observations of the Crab Nebula at 60 arcmin off-axis were obtained at two different satellite roll angles. The stray light intensity obtained at each roll angle was significantly different, verifying the dependence of the stray light on the roll angle.

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Ground calibration of the x-ray mirror assembly for the X-Ray Imaging and Spectroscopy Mission (XRISM) III-performance variation across the aperture

Cited by 3 publications

References 13 publications

Ground calibration of the x-ray mirror assembly for the x-ray imaging and spectroscopy mission (XRISM) I-measurement setup and effective area

Ground calibration of the x-ray mirror assembly for the x-ray imaging and spectroscopy mission (XRISM) I-measurement setup and effective area

Xtend, the soft x-ray imaging telescope for the x-ray imaging and spectroscopy mission (XRISM)

In-orbit performance of the Xtend-XMA onboard XRISM

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