In-orbit Performance of the Soft X-ray Imaging Telescope Xtend aboard XRISM

Journal article

H. Uchida, K. Mori, H. Tomida, H. Nakajima, H. Noda, Takaaki Tanaka, Hiroshi Murakami, Hiromasa Suzuki, S. Kobayashi, T. Yoneyama, Kouichi Hagino, K. Nobukawa, H. Uchiyama, M. Nobukawa, Hironori Matsumoto, T. Tsuru, M. Yamauchi, I. Hatsukade, H. Odaka, T. Kohmura, K. Yamaoka, Tessei Yoshida, Y. Kanemaru, D. Ishi, T. Dotani, M. Ozaki, H. Tsunemi, Keitaro Miyazaki, Kohei Kusunoki, Yoshinori Otsuka, Haruhiko Yokosu, Wakana Yonemaru, Kazuhiro Ichikawa, Hanako Nakano, Reo Takemoto, Tsukasa Matsushima, Reika Urase, Jun Kurashima, Kotomi Fuchi, K. Hayakawa, Masahiro Fukuda, Shun Inoue, Y. Aoki, Kouta Takayama, Takashi Sako, M. Yoshimoto, Kohei Shima, Mayu Higuchi, Kaito Ninoyu, Daiki Aoki, Shun Tsunomachi, T. Okajima, Manabu Ishida, Y. Maeda, T. Hayashi, Keisuke Tamura, R. Boissay-Malaquin, Toshiki Sato, M. Takeo, Asca Miyamoto, G. Matsumoto, M. Eckart, N. Hell, M. Leutenegger, And Kiyoshi Hayashida
2025

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APA Click to copy
Uchida, H., Mori, K., Tomida, H., Nakajima, H., Noda, H., Tanaka, T., … Hayashida, A. K. (2025). In-orbit Performance of the Soft X-ray Imaging Telescope Xtend aboard XRISM.

Chicago/Turabian Click to copy
Uchida, H., K. Mori, H. Tomida, H. Nakajima, H. Noda, Takaaki Tanaka, Hiroshi Murakami, et al. “In-Orbit Performance of the Soft X-Ray Imaging Telescope Xtend Aboard XRISM” (2025).

MLA Click to copy
Uchida, H., et al. In-Orbit Performance of the Soft X-Ray Imaging Telescope Xtend Aboard XRISM. 2025.

BibTeX Click to copy

@article{h2025a,
  title = {In-orbit Performance of the Soft X-ray Imaging Telescope Xtend aboard XRISM},
  year = {2025},
  author = {Uchida, H. and Mori, K. and Tomida, H. and Nakajima, H. and Noda, H. and Tanaka, Takaaki and Murakami, Hiroshi and Suzuki, Hiromasa and Kobayashi, S. and Yoneyama, T. and Hagino, Kouichi and Nobukawa, K. and Uchiyama, H. and Nobukawa, M. and Matsumoto, Hironori and Tsuru, T. and Yamauchi, M. and Hatsukade, I. and Odaka, H. and Kohmura, T. and Yamaoka, K. and Yoshida, Tessei and Kanemaru, Y. and Ishi, D. and Dotani, T. and Ozaki, M. and Tsunemi, H. and Miyazaki, Keitaro and Kusunoki, Kohei and Otsuka, Yoshinori and Yokosu, Haruhiko and Yonemaru, Wakana and Ichikawa, Kazuhiro and Nakano, Hanako and Takemoto, Reo and Matsushima, Tsukasa and Urase, Reika and Kurashima, Jun and Fuchi, Kotomi and Hayakawa, K. and Fukuda, Masahiro and Inoue, Shun and Aoki, Y. and Takayama, Kouta and Sako, Takashi and Yoshimoto, M. and Shima, Kohei and Higuchi, Mayu and Ninoyu, Kaito and Aoki, Daiki and Tsunomachi, Shun and Okajima, T. and Ishida, Manabu and Maeda, Y. and Hayashi, T. and Tamura, Keisuke and Boissay-Malaquin, R. and Sato, Toshiki and Takeo, M. and Miyamoto, Asca and Matsumoto, G. and Eckart, M. and Hell, N. and Leutenegger, M. and Hayashida, And Kiyoshi}
}

Abstract

We present a summary of the in-orbit performance of the soft X-ray imaging telescope Xtend onboard the XRISM mission, based on in-flight observation data, including first-light celestial objects, calibration sources, and results from the cross-calibration campaign with other currently-operating X-ray observatories. XRISM/Xtend has a large field of view of $38.5'\times38.5'$, covering an energy range of 0.4--13 keV, as demonstrated by the first-light observation of the galaxy cluster Abell 2319. It also features an energy resolution of 170--180 eV at 6 keV, which meets the mission requirement and enables to resolve He-like and H-like Fe K$\alpha$ lines. Throughout the observation during the performance verification phase, we confirm that two issues identified in SXI onboard the previous Hitomi mission -- light leakage and crosstalk events -- are addressed and suppressed in the case of Xtend. A joint cross-calibration observation of the bright quasar 3C273 results in an effective area measured to be $\sim420$ cm$^{2}[email protected] keV and $\sim310$ cm$^{2}[email protected] keV, which matches values obtained in ground tests. We also continuously monitor the health of Xtend by analyzing overclocking data, calibration source spectra, and day-Earth observations: the readout noise is stable and low, and contamination is negligible even one year after launch. A low background level compared to other major X-ray instruments onboard satellites, combined with the largest grasp ($\Omega_{\rm eff}\sim60$ ${\rm cm^2~degree^2}$) of Xtend, will not only support Resolve analysis, but also enable significant scientific results on its own. This includes near future follow-up observations and transient searches in the context of time-domain and multi-messenger astrophysics.