論文

2024年12月26日

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

Publications of the Astronomical Society of Japan
  • Marc Audard
  • Hisamitsu Awaki
  • Ralf Ballhausen
  • Aya Bamba
  • Ehud Behar
  • Rozenn Boissay-Malaquin
  • Laura Brenneman
  • Gregory V Brown
  • Lia Corrales
  • Elisa Costantini
  • Renata Cumbee
  • Maria Diaz-Trigo
  • Chris Done
  • Tadayasu Dotani
  • Ken Ebisawa
  • Megan Eckart
  • Dominique Eckert
  • Teruaki Enoto
  • Satoshi Eguchi
  • Yuichiro Ezoe
  • Adam Foster
  • Ryuichi Fujimoto
  • Yutaka Fujita
  • Yasushi Fukazawa
  • Kotaro Fukushima
  • Akihiro Furuzawa
  • Luigi Gallo
  • Javier A García
  • Liyi Gu
  • Matteo Guainazzi
  • Kouichi Hagino
  • Kenji Hamaguchi
  • Isamu Hatsukade
  • Katsuhiro Hayashi
  • Takayuki Hayashi
  • Natalie Hell
  • Edmund Hodges-Kluck
  • Ann Hornschemeier
  • Yuto Ichinohe
  • Manabu Ishida
  • Kumi Ishikawa
  • Yoshitaka Ishisaki
  • Jelle Kaastra
  • Timothy Kallman
  • Erin Kara
  • Satoru Katsuda
  • Yoshiaki Kanemaru
  • Richard Kelley
  • Caroline Kilbourne
  • Shunji Kitamoto
  • Shogo Kobayashi
  • Takayoshi Kohmura
  • Aya Kubota
  • Maurice Leutenegger
  • Michael Loewenstein
  • Yoshitomo Maeda
  • Maxim Markevitch
  • Hironori Matsumoto
  • Kyoko Matsushita
  • Dan McCammon
  • Brian McNamara
  • François Mernier
  • Eric D Miller
  • Jon M Miller
  • Ikuyuki Mitsuishi
  • Misaki Mizumoto
  • Tsunefumi Mizuno
  • Koji Mori
  • Koji Mukai
  • Hiroshi Murakami
  • Richard Mushotzky
  • Hiroshi Nakajima
  • Kazuhiro Nakazawa
  • Jan-Uwe Ness
  • Kumiko Nobukawa
  • Masayoshi Nobukawa
  • Hirofumi Noda
  • Hirokazu Odaka
  • Shoji Ogawa
  • Anna Ogorzalek
  • Takashi Okajima
  • Naomi Ota
  • Stephane Paltani
  • Robert Petre
  • Paul Plucinsky
  • Frederick Scott Porter
  • Katja Pottschmidt
  • Kosuke Sato
  • Toshiki Sato
  • Makoto Sawada
  • Hiromi Seta
  • Megumi Shidatsu
  • Aurora Simionescu
  • Randall Smith
  • Hiromasa Suzuki
  • Andrew Szymkowiak
  • Hiromitsu Takahashi
  • Mai Takeo
  • Toru Tamagawa
  • Keisuke Tamura
  • Takaaki Tanaka
  • Atsushi Tanimoto
  • Makoto Tashiro
  • Yukikatsu Terada
  • Yuichi Terashima
  • Yohko Tsuboi
  • Masahiro Tsujimoto
  • Hiroshi Tsunemi
  • Takeshi G Tsuru
  • Hiroyuki Uchida
  • Nagomi Uchida
  • Yuusuke Uchida
  • Hideki Uchiyama
  • Yoshihiro Ueda
  • Shinichiro Uno
  • Jacco Vink
  • Shin Watanabe
  • Brian J Williams
  • Satoshi Yamada
  • Shinya Yamada
  • Hiroya Yamaguchi
  • Kazutaka Yamaoka
  • Noriko Yamasaki
  • Makoto Yamauchi
  • Shigeo Yamauchi
  • Tahir Yaqoob
  • Tomokage Yoneyama
  • Tessei Yoshida
  • Mihoko Yukita
  • Irina Zhuravleva
  • Q Daniel Wang
  • Yuki Amano
  • Kojiro Tanaka
  • Takuto Narita
  • Yuken Ohshiro
  • Anje Yoshimoto
  • Yuma Aoki
  • Mayura Balakrishnan
  • 全て表示

記述言語
掲載種別
研究論文(学術雑誌)
DOI
10.1093/pasj/psae111
出版者・発行元
Oxford University Press (OUP)

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.

リンク情報
DOI
https://doi.org/10.1093/pasj/psae111
URL
https://academic.oup.com/pasj/advance-article-pdf/doi/10.1093/pasj/psae111/61276638/psae111.pdf
ID情報
  • DOI : 10.1093/pasj/psae111
  • ISSN : 0004-6264
  • eISSN : 2053-051X

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