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arxiv: 1711.06289 · v1 · submitted 2017-11-16 · 🌌 astro-ph.HE

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Hitomi Observation of Radio Galaxy NGC 1275: The First X-ray Microcalorimeter Spectroscopy of Fe-K{α} Line Emission from an Active Galactic Nucleus

Hitomi Collaboration: Felix Aharonian , Hiroki Akamatsu , Fumie Akimoto , Steven W. Allen , Lorella Angelini , Marc Audard , Hisamitsu Awaki , Magnus Axelsson
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Aya Bamba Marshall W. Bautz Roger Blandford Laura W. Brenneman Gregory V. Brown Esra Bulbul Edward M. Cackett Maria Chernyakova Meng P. Chiao Paolo S. Coppi Elisa Costantini Jelle de Plaa Cor P. de Vries Jan-Willem den Herder Chris Done Tadayasu Dotani Ken Ebisawa Megan E. Eckart Teruaki Enoto Yuichiro Ezoe Andrew C. Fabian Carlo Ferrigno Adam R. Foster Ryuichi Fujimoto Yasushi Fukazawa Akihiro Furuzawa Massimiliano Galeazzi Luigi C. Gallo Poshak Gandhi Margherita Giustini Andrea Goldwurm Liyi Gu Matteo Guainazzi Yoshito Haba Kouichi Hagino Kenji Hamaguchi Ilana M. Harrus Isamu Hatsukade Katsuhiro Hayashi Takayuki Hayashi Kiyoshi Hayashida Junko S. Hiraga Ann Hornschemeier Akio Hoshino John P. 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 Richard L. Kelley Caroline A. Kilbourne Takao Kitaguchi Shunji Kitamoto Tetsu Kitayama Takayoshi Kohmura Motohide Kokubun Katsuji Koyama Shu Koyama Peter Kretschmar Hans A. Krimm Aya Kubota Hideyo Kunieda Philippe Laurent Shiu-Hang Lee Maurice A. Leutenegger Olivier O. Limousin Michael Loewenstein Knox S. Long David Lumb Greg Madejski Yoshitomo Maeda Daniel Maier Kazuo Makishima Maxim Markevitch Hironori Matsumoto Kyoko Matsushita Dan McCammon Brian R. 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 Richard F. Mushotzky Takao Nakagawa Hiroshi Nakajima Takeshi Nakamori Shinya Nakashima Kazuhiro Nakazawa Kumiko K. Nobukawa Masayoshi Nobukawa Hirofumi Noda Hirokazu Odaka Takaya Ohashi Masanori Ohno Takashi Okajima Naomi Ota Masanobu Ozaki Frits Paerels St\'ephane Paltani Robert Petre Ciro Pinto Frederick S. Porter Katja Pottschmidt Christopher S. Reynolds Samar Safi-Harb Shinya Saito Kazuhiro Sakai Toru Sasaki Goro Sato Kosuke Sato Rie Sato Makoto Sawada Norbert Schartel Peter J. Serlemitsos Hiromi Seta Megumi Shidatsu Aurora Simionescu Randall K. Smith Yang Soong {\L}ukasz 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 Yasuyuki T. Tanaka Makoto S. 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 Brian J. Williams Shinya Yamada Hiroya Yamaguchi Kazutaka Yamaoka Noriko Y. Yamasaki Makoto Yamauchi Shigeo Yamauchi Tahir Yaqoob Yoichi Yatsu Daisuke Yonetoku Irina Zhuravleva Abderahmen Zoghbi Taiki Kawamuro
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classification 🌌 astro-ph.HE
keywords linealphafe-kactivegalactichitominucleusbroad
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The origin of the narrow Fe-K{\alpha} fluorescence line at 6.4 keV from active galactic nuclei has long been under debate; some of the possible sites are the outer accretion disk, the broad line region, a molecular torus, or interstellar/intracluster media. In February-March 2016, we performed the first X-ray microcalorimeter spectroscopy with the Soft X-ray Spectrometer (SXS) onboard the Hitomi satellite of the Fanaroff-Riley type I radio galaxy NGC 1275 at the center of the Perseus cluster of galaxies. With the high energy resolution of ~5 eV at 6 keV achieved by Hitomi/SXS, we detected the Fe-K{\alpha} line with ~5.4 {\sigma} significance. The velocity width is constrained to be 500-1600 km s$^{-1}$ (FWHM for Gaussian models) at 90% confidence. The SXS also constrains the continuum level from the NGC 1275 nucleus up to ~20 keV, giving an equivalent width ~20 eV of the 6.4 keV line. Because the velocity width is narrower than that of broad H{\alpha} line of ~2750 km s$^{-1}$, we can exclude a large contribution to the line flux from the accretion disk and the broad line region. Furthermore, we performed pixel map analyses on the Hitomi/SXS data and image analyses on the Chandra archival data, and revealed that the Fe-K{\alpha} line comes from a region within ~1.6 kpc from the NGC 1275 core, where an active galactic nucleus emission dominates, rather than that from intracluster media. Therefore, we suggest that the source of the Fe-K{\alpha} line from NGC 1275 is likely a low-covering fraction molecular torus or a rotating molecular disk which probably extends from a pc to hundreds pc scale in the active galactic nucleus system.

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