Hitomi observations of the LMC SNR N 132 D: Highly redshifted X-ray emission from iron ejecta

Felix Aharonian , Hiroki Akamatsu , Fumie Akimoto , Stevenw. Allen , Lorella Angelini , Marc Audard , Hisamitsu Awaki , Magnus Axelsson , Aya Bamba , Marshallw. Bautz , Roger Blandford , Lauraw. Brenneman , Gregoryv. Brown , Esra Bulbul , Edward M. Cackett , Maria Chernyakova , Meng P. Chiao , Paolos. Coppi , Elisa Costantini , Jelle de Plaa , Cor P. de Vries , Jan-Willem den Herder , Chris Done , Tadayasu Dotani , Ken Ebisawa , Megane. Eckart , Teruaki Enoto , Yuichiro Ezoe , Andrewc. Fabian , Carlo Ferrigno , Adamr. Foster , Ryuichi Fujimoto , Yasushi Fukazawa , Akihiro Furuzawa , Massimiliano Galeazzi , Luigic. Gallo , Poshak Gandhi , Margherita Giustini , Andrea Goldwurm (1, 2) , Liyi Gu , Matteo Guainazzi , Yoshito Haba , Kouichi Hagino , Kenji Hamaguchi , Ilanam. Harrus , Isamu Hatsukade , Katsuhiro Hayashi , Takayuki Hayashi , Kiyoshi Hayashida , Junkos. Hiraga , Ann Hornschemeier , Akio Hoshino , Johnp. Hughes , Yuto Ichinohe , Ryo Iizuka , Hajime Inoue , Yoshiyuki Inoue , Manabu Ishida , Kumi Ishikawa , Yoshitaka Ishisaki , Masachika Iwai , Jelle Kaastra , Tim Kallman , Tsuneyoshi Kamae , Jun Kataoka , Satoru Katsuda , Nobuyuki Kawai , Richardl. Kelley , Carolinea. Kilbourne , Takao Kitaguchi , Shunji Kitamoto , Tetsu Kitayama , Takayoshi Kohmura , Motohide Kokubun , Katsuji Koyama , Shu Koyama , Peter Kretschmar , Hansa. Krimm , Aya Kubota , Hideyo Kunieda , Philippe Laurent (1, 2) , Shiu-Hang Lee , Mauricea. Leutenegger , Olivier Limousin (2) , Michael Loewenstein , Knoxs. Long , David Lumb , Greg Madejski , Yoshitomo Maeda , Daniel Maier (1, 2) , Kazuo Makishima , Maxim Markevitch , Hironori Matsumoto , Kyoko Matsushita , Dan Mccammon , Brianr. Mcnamara , Missagh Mehdipour , Eric D. Miller , Jon M. Miller , Shin Mineshige , Kazuhisa Mitsuda , Ikuyuki Mitsuishi , Takuya Miyazawa , Tsunefumi Mizuno , Hideyuki Mori , Koji Mori , Koji Mukai , Hiroshi Murakami , Richardf. Mushotzky , Takao Nakagawa , Hiroshi Nakajima , Takeshi Nakamori , Shinya Nakashima , Kazuhiro Nakazawa , Kumikok. Nobukawa , Masayoshi Nobukawa , Hirofumi Noda , Hirokazu Odaka , Takaya Ohashi , Masanori Ohno , Takashi Okajima , Naomi Ota , Masanobu Ozaki , Frits Paerels , Stéphane Paltani , Robert Petre , Ciro Pinto , Fredericks. Porter , Katja Pottschmidt , Christophers. Reynolds , Samar Safi-Harb , Shinya Saito , Kazuhiro Sakai , Toru Sasaki , Goro Sato , Kosuke Sato , Rie Sato , Toshiki Sato , Makoto Sawada , Norbert Schartel , Peterj. Serlemtsos , Hiromi Seta , Megumi Shidatsu , Aurora Simionescu , Randallk. Smith , Yang Soong , Łukasz Stawarz , Yasuharu Sugawara , Satoshi Sugita , Andrew Szymkowiak , Hiroyasu Tajima , Hiromitsu Takahashi , Tadayuki Takahashi , Shin'Ichiro Takeda , Yoh Takei , Toru Tamagawa , Takayuki Tamura , Takaaki Tanaka , Yasuo Tanaka , Yasuyukit. Tanaka , Makotos. Tashiro , Yuzuru Tawara , Yukikatsu Terada , Yuichi Terashima , Francesco Tombesi , Hiroshi Tomida , Yohko Tsuboi , Masahiro Tsujimoto , Hiroshi Tsunemi , Takeshi Go Tsuru , Hiroyuki Uchida , Hideki Uchiyama , Yasunobu Uchiyama , Shutaro Ueda , Yoshihiro Ueda , Shin'Ichiro Uno , C.Megan Urry , Eugenio Ursino , Shin Watanabe , Norbert Werner , Dan R. Wilkins , Brianj. Williams , Shinya Yamada , Hiroya Yamaguchi , Kazutaka Yamaoka , Norikoy. Yamasaki , Makoto Yamauchi , Shigeo Yamauchi , Tahir Yaqoob , Yoichi Yatsu , Daisuke Yonetoku , Irina Zhuravleva , Abderahmen Zoghbi

1 APC (UMR_7164) - AstroParticule et Cosmologie
2 CEA - Commissariat à l'énergie atomique et aux énergies alternatives

We present Hitomi observations of N 132 D, a young, X-ray bright, O-rich core-collapse supernova remnant in the Large Magellanic Cloud (LMC). Despite a very short observation of only 3.7 ks, the Soft X-ray Spectrometer (SXS) easily detects the line complexes of highly ionized S K and Fe K with 16–17 counts in each. The Fe feature is measured for the first time at high spectral resolution. Based on the plausible assumption that the Fe K emission is dominated by He-like ions, we find that the material responsible for this Fe emission is highly redshifted at ∼ 800 km s^−1 compared to the local LMC interstellar medium (ISM), with a 90% credible interval of 50–1500 km s^−1 if a weakly informative prior is placed on possible line broadening. This indicates (1) that the Fe emission arises from the supernova ejecta, and (2) that these ejecta are highly asymmetric, since no blueshifted component is found. The S K velocity is consistent with the local LMC ISM, and is likely from swept-up ISM material. These results are consistent with spatial mapping that shows the He-like Fe concentrated in the interior of the remnant and the S tracing the outer shell. The results also show that even with a very small number of counts, direct velocity measurements from Doppler-shifted lines detected in extended objects like supernova remnants are now possible. Thanks to the very low SXS background of ∼ 1 event per spectral resolution element per 100 ks, such results are obtainable during short pointed or slew observations with similar instruments. This highlights the power of high-spectral-resolution imaging observations, and demonstrates the new window that has been opened with Hitomi and will be greatly widened with future missions such as the X-ray Astronomy Recovery Mission (XARM) and Athena.

Domaines: Astrophysique [astro-ph]

Felix Aharonian, Hiroki Akamatsu, Fumie Akimoto, Stevenw. Allen, Lorella Angelini, et al.. Hitomi observations of the LMC SNR N 132 D: Highly redshifted X-ray emission from iron ejecta. Publ.Astron.Soc.Jap., 2018, 70 (2), pp.16. ⟨10.1093/pasj/psx151⟩. ⟨hal-01792462⟩