Overionized plasma in the supernova remnant Sagittarius A East anchored by XRISM observations

Journal article

Xrism collaboration, M. Audard, H. Awaki, R. Ballhausen, A. Bamba, E. Behar, R. Boissay-Malaquin, L. Brenneman, G. V. Brown, Lia Corrales, E. Costantini, R. Cumbee, M. Díaz-Trigo, C. Done, T. Dotani, K. Ebisawa, M. Eckart, Dominique Eckert, T. Enoto, Satoshi Eguchi, Y. Ezoe, A. Foster, R. Fujimoto, Y. Fujita, Y. Fukazawa, Kotaro Fukushima, A. Furuzawa, L. Gallo, Javier A. García, Liyi Gu, M. Guainazzi, Kouichi Hagino, Kenji Hamaguchi, I. Hatsukade, K. Hayashi, T. Hayashi, N. Hell, E. Hodges-Kluck, A. Hornschemeier, Y. Ichinohe, Manabu Ishida, K. Ishikawa, Y. Ishisaki, J. Kaastra, T. Kallman, Erin Kara, S. Katsuda, Y. Kanemaru, Rich Kelley, C. Kilbourne, S. Kitamoto, S. Kobayashi, T. Kohmura, A. Kubota, M. Leutenegger, M. Loewenstein, Y. Maeda, M. Markevitch, Hironori Matsumoto, K. Matsushita, D. McCammon, Brian McNamara, F. Mernier, Eric D. Miller, Jon M. Miller, I. Mitsuishi, M. Mizumoto, T. Mizuno, K. Mori, K. Mukai, Hiroshi Murakami, R. Mushotzky, H. Nakajima, K. Nakazawa, J. Ness, K. Nobukawa, M. Nobukawa, H. Noda, H. Odaka, S. Ogawa, A. Ogorzałek, T. Okajima, Naomi Ota, S. Paltani, R. Petre, P. Plucinsky, F. Porter, K. Pottschmidt, Kosuke Sato, Toshiki Sato, M. Sawada, H. Seta, M. Shidatsu, A. Simionescu, Randall K. Smith, Hiromasa Suzuki, A. Szymkowiak, H. Takahashi, M. Takeo, T. Tamagawa, Keisuke Tamura, Takaaki Tanaka, A. Tanimoto, M. Tashiro, Y. Terada, Y. Terashima, Y. Tsuboi, M. Tsujimoto, H. Tsunemi, T. Tsuru, Hiroyuki Uchida, N. Uchida, Y. Uchida, H. Uchiyama, Y. Ueda, S. Uno, J. Vink, S. Watanabe, Brian J. Williams, S. Yamada, S. Yamada, Hiroya Yamaguchi, K. Yamaoka, N. Yamasaki, M. Yamauchi, S. Yamauchi, T. Yaqoob, T. Yoneyama, Tessei Yoshida, M. Yukita, I. Zhuravleva, Q. D. Wang, Yuki Amano, Kojiro Tanaka, Takuto Narita, Yuken Ohshiro, Anje Yoshimoto, Y. Aoki, Mayura Balakrishnan, Anton Pannekoek
Nippon Tenmon Gakkai obun kenkyu hokoku, 2024

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APA Click to copy
collaboration, X., Audard, M., Awaki, H., Ballhausen, R., Bamba, A., Behar, E., … Pannekoek, A. (2024). Overionized plasma in the supernova remnant Sagittarius A East anchored by XRISM observations. Nippon Tenmon Gakkai Obun Kenkyu Hokoku.

Chicago/Turabian Click to copy
collaboration, Xrism, M. Audard, H. Awaki, R. Ballhausen, A. Bamba, E. Behar, R. Boissay-Malaquin, et al. “Overionized Plasma in the Supernova Remnant Sagittarius A East Anchored by XRISM Observations.” Nippon Tenmon Gakkai obun kenkyu hokoku (2024).

MLA Click to copy
collaboration, Xrism, et al. “Overionized Plasma in the Supernova Remnant Sagittarius A East Anchored by XRISM Observations.” Nippon Tenmon Gakkai Obun Kenkyu Hokoku, 2024.

BibTeX Click to copy

@article{xrism2024a,
  title = {Overionized plasma in the supernova remnant Sagittarius A East anchored by XRISM observations},
  year = {2024},
  journal = {Nippon Tenmon Gakkai obun kenkyu hokoku},
  author = {collaboration, Xrism and Audard, M. and Awaki, H. and Ballhausen, R. and Bamba, A. and Behar, E. and Boissay-Malaquin, R. and Brenneman, L. and Brown, G. V. and Corrales, Lia and Costantini, E. and Cumbee, R. and Díaz-Trigo, M. and Done, C. and Dotani, T. and Ebisawa, K. and Eckart, M. and Eckert, Dominique and Enoto, T. and Eguchi, Satoshi and Ezoe, Y. and Foster, A. and Fujimoto, R. and Fujita, Y. and Fukazawa, Y. and Fukushima, Kotaro and Furuzawa, A. and Gallo, L. and García, Javier A. and Gu, Liyi and Guainazzi, M. and Hagino, Kouichi and Hamaguchi, Kenji and Hatsukade, I. and Hayashi, K. and Hayashi, T. and Hell, N. and Hodges-Kluck, E. and Hornschemeier, A. and Ichinohe, Y. and Ishida, Manabu and Ishikawa, K. and Ishisaki, Y. and Kaastra, J. and Kallman, T. and Kara, Erin and Katsuda, S. and Kanemaru, Y. and Kelley, Rich and Kilbourne, C. and Kitamoto, S. and Kobayashi, S. and Kohmura, T. and Kubota, A. and Leutenegger, M. and Loewenstein, M. and Maeda, Y. and Markevitch, M. and Matsumoto, Hironori and Matsushita, K. and McCammon, D. and McNamara, Brian and Mernier, F. and Miller, Eric D. and Miller, Jon M. and Mitsuishi, I. and Mizumoto, M. and Mizuno, T. and Mori, K. and Mukai, K. and Murakami, Hiroshi and Mushotzky, R. and Nakajima, H. and Nakazawa, K. and Ness, J. and Nobukawa, K. and Nobukawa, M. and Noda, H. and Odaka, H. and Ogawa, S. and Ogorzałek, A. and Okajima, T. and Ota, Naomi and Paltani, S. and Petre, R. and Plucinsky, P. and Porter, F. and Pottschmidt, K. and Sato, Kosuke and Sato, Toshiki and Sawada, M. and Seta, H. and Shidatsu, M. and Simionescu, A. and Smith, Randall K. and Suzuki, Hiromasa and Szymkowiak, A. and Takahashi, H. and Takeo, M. and Tamagawa, T. and Tamura, Keisuke and Tanaka, Takaaki and Tanimoto, A. and Tashiro, M. and Terada, Y. and Terashima, Y. and Tsuboi, Y. and Tsujimoto, M. and Tsunemi, H. and Tsuru, T. and Uchida, Hiroyuki and Uchida, N. and Uchida, Y. and Uchiyama, H. and Ueda, Y. and Uno, S. and Vink, J. and Watanabe, S. and Williams, Brian J. and Yamada, S. and Yamada, S. and Yamaguchi, Hiroya and Yamaoka, K. and Yamasaki, N. and Yamauchi, M. and Yamauchi, S. and Yaqoob, T. and Yoneyama, T. and Yoshida, Tessei and Yukita, M. and Zhuravleva, I. and Wang, Q. D. and Amano, Yuki and Tanaka, Kojiro and Narita, Takuto and Ohshiro, Yuken and Yoshimoto, Anje and Aoki, Y. and Balakrishnan, Mayura and Pannekoek, Anton}
}

Abstract

Sagittarius A East is a supernova remnant with a unique surrounding environment, as it is located in the immediate vicinity of the supermassive black hole at the Galactic center, Sagittarius A$^{}$. The X-ray emission of the remnant is suspected to show features of overionized plasma, which would require peculiar evolutionary paths. We report on the first observation of Sagittarius A East with the X-Ray Imaging and Spectroscopy Mission (XRISM). Equipped with a combination of a high-resolution microcalorimeter spectrometer and a large field-of-view CCD imager, we for the first time resolved the Fe xxv K-shell lines into fine structure lines and measured the forbidden-to-resonance intensity ratio to be $1.39 \pm 0.12$, which strongly suggests the presence of overionized plasma. We obtained a reliable constraint on the ionization temperature just before the transition into the overionization state, of $\gt! 4:$keV. The recombination timescale was constrained to be $\lt! 8 \times 10^{11} :$cm$^{-3}:$s. The small velocity dispersion of $109 \pm 6:$km$:$s$^{-1}$ indicates a low Fe ion temperature $\lt! 8:$keV and a small expansion velocity $\lt! 200:$km$:$s$^{-1}$. The high initial ionization temperature and small recombination timescale suggest that either rapid cooling of the plasma via adiabatic expansion from dense circumstellar material or intense photoionization by Sagittarius A$^{}$ in the past may have triggered the overionization.