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Title: Hitomi observation of radio galaxy NGC 1275: The first X-ray microcalorimeter spectroscopy of Fe-Kα line emission from an active galactic nucleus*

The origin of the narrow Fe-Kα 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-Kα line with ~5.4 σ 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 Hα 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,more » and revealed that the Fe-Kα 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-Kα 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.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [4] ;  [11] ;  [12] ;  [10] ;  [13] ;  [1] ;  [5] ;  [14] ;  [2] ;  [2] more »;  [2] ;  [2] ;  [15] ;  [16] ;  [16] ;  [5] ;  [17] ;  [18] ;  [19] ;  [6] ;  [11] ;  [20] ;  [21] ;  [22] ;  [23] ;  [24] ;  [25] ;  [2] ;  [26] ;  [2] ;  [27] ;  [28] ;  [16] ;  [29] ;  [29] ;  [30] ;  [16] ;  [3] ;  [31] ;  [32] ;  [5] ;  [33] ;  [34] ;  [18] ;  [16] ;  [35] ;  [16] ;  [16] ;  [16] ;  [18] ;  [16] ;  [2] ;  [5] ;  [36] ;  [37] ;  [38] ;  [39] ;  [5] ;  [5] ;  [21] ;  [33] ;  [40] ;  [41] ;  [16] ;  [42] ;  [16] ;  [43] ;  [44] ;  [45] ;  [3] ;  [26] ;  [16] ;  [5] ;  [46] ;  [5] ;  [47] ;  [27] ;  [48] ;  [16] ;  [26] ;  [49] ;  [5] ;  [31] ;  [50] ;  [51] ;  [52] ;  [2] ;  [10] ;  [53] ;  [54] ;  [16] ;  [3] ;  [55] ;  [21] ;  [5] ;  [30] ;  [29] ;  [56] ;  [57] ;  [16] ;  [31] ;  [58] ;  [49] ;  [36] ;  [59] ;  [60] ;  [61] ;  [48] ;  [18] ;  [21] ;  [5] ;  [59] ;  [16] ;  [62] ;  [6] ;  [5] ;  [19] ;  [5] ;  [29] ;  [57] ;  [63] ;  [33] ;  [5] ;  [50] ;  [16] ;  [50] ;  [16] ;  [64] ;  [43] ;  [5] ;  [18] ;  [49] ;  [16] ;  [11] ;  [5] ;  [65] ;  [16] ;  [39] ;  [66] ;  [67] ;  [21] ;  [16] ;  [55] ;  [16] ;  [68] ;  [16] ;  [42] ;  [16] ;  [21] ;  [69] ;  [3] ;  [69] ;  [7] ;  [70] ;  [16] ;  [38] ;  [16] ;  [31] ;  [42] ;  [42] ;  [71] ;  [33] ;  [16] ;  [54] ;  [72] ;  [66] ;  [23] ;  [16] ;  [73] ;  [48] ;  [47] ;  [18] ;  [5] ;  [3] ;  [16] ;  [30] ;  [59] ;  [29] ;  [39] ;  [20] ;  [74] ;  [53] ;  [75] « less
  1. Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, Dublin 2, Ireland
  2. SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
  3. Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
  4. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305, USA; Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA; SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA
  5. NASA, Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA
  6. Department of Astronomy, University of Geneva, ch. d’Écogia 16, CH-1290 Versoix, Switzerland
  7. Department of Physics, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
  8. Department of Physics and Oskar Klein Center, Stockholm University, 106 91 Stockholm, Sweden
  9. Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan; Research Center for the Early Universe, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  10. Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
  11. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
  12. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, USA
  13. Department of Physics and Astronomy, Wayne State University, 666 W. Hancock St, Detroit, MI 48201, USA
  14. Department of Physics, Yale University, New Haven, CT 06520-8120, USA; Department of Astronomy, Yale University, New Haven, CT 06520-8101, USA
  15. Centre for Extragalactic Astronomy, Department of Physics, University of Durham, South Road, Durham, DH1 3LE, UK
  16. Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, 3-1-1 Yoshino-dai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan
  17. Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan; The Hakubi Center for Advanced Research, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan
  18. Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
  19. Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK
  20. Faculty of Mathematics and Physics, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan
  21. School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
  22. Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Toyoake, Aichi 470-1192, Japan
  23. Physics Department, University of Miami, 1320 Campo Sano Dr., Coral Gables, FL 33146, USA
  24. Department of Astronomy and Physics, Saint Mary’s University, 923 Robie Street, Halifax, NS, B3H 3C3, Canada
  25. Department of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
  26. Laboratoire APC, 10 rue Alice Domon et Léonie Duquet, 75013 Paris, France; CEA Saclay, 91191 Gif sur Yvette, France
  27. European Space Research and Technology Center, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
  28. Department of Physics and Astronomy, Aichi University of Education, 1 Hirosawa, Igaya-cho, Kariya, Aichi 448-8543, Japan
  29. NASA, Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA; Department of Physics, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
  30. Department of Applied Physics and Electronic Engineering, University of Miyazaki, 1-1 Gakuen Kibanadai-Nishi, Miyazaki, Miyazaki 889-2192, Japan
  31. Department of Earth and Space Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
  32. Department of Physics, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
  33. Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan
  34. Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854, USA
  35. Meisei University, 2-1-1 Hodokubo, Hino, Tokyo 191-8506, Japan
  36. Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  37. Research Institute for Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan
  38. Department of Physics, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
  39. Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
  40. Department of Physics, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
  41. Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
  42. Department of Physics, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo, Kyoto, Kyoto 606-8502, Japan
  43. European Space Astronomy Center, Camino Bajo del Castillo, s/n., 28692 Villanueva de la Cañada, Madrid, Spain
  44. Universities Space Research Association, 7178 Columbia Gateway Drive, Columbia, MD 21046, USA; National Science Foundation, 4201 Wilson Blvd, Arlington, VA 22230, USA
  45. Department of Electronic Information Systems, Shibaura Institute of Technology, 307 Fukasaku, Minuma-ku, Saitama, Saitama 337-8570, Japan
  46. CEA Saclay, 91191 Gif sur Yvette, France
  47. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
  48. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305, USA
  49. Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  50. Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
  51. Department of Physics, University of Wisconsin, Madison, WI 53706, USA
  52. Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada
  53. Department of Astronomy, University of Michigan, 1085 South University Avenue, Ann Arbor, MI 48109, USA
  54. Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan
  55. Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Kunigami-gun, Okinawa 904-0495, Japan
  56. Faculty of Liberal Arts, Tohoku Gakuin University, 2-1-1 Tenjinzawa, Izumi-ku, Sendai, Miyagi 981-3193, Japan
  57. Department of Astronomy, University of Maryland, College Park, MD 20742, USA
  58. Faculty of Science, Yamagata University, 1-4-12 Kojirakawa-machi, Yamagata, Yamagata 990-8560, Japan
  59. Department of Physics, Nara Women’s University, Kitauoyanishi-machi, Nara, Nara 630-8506, Japan
  60. Department of Teacher Training and School Education, Nara University of Education, Takabatake-cho, Nara, Nara 630-8528, Japan
  61. Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 6-3 Aramakiazaaoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan; Astronomical Institute, Tohoku University, 6-3 Aramakiazaaoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
  62. Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA
  63. Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
  64. Department of Physics and Mathematics, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
  65. Astronomical Observatory of Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland
  66. Department of Physics, Yale University, New Haven, CT 06520-8120, USA
  67. Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Chikusa-ku, Aichi 464-8601, Japan
  68. RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  69. Department of Physics, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama, 338-8570, Japan
  70. NASA, Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA; Department of Astronomy, University of Maryland, College Park, MD 20742, USA
  71. Faculty of Education, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka 422-8529, Japan
  72. Faculty of Health Sciences, Nihon Fukushi University, 26-2 Higashi Haemi-cho, Handa, Aichi 475-0012, Japan
  73. MTA-Eötvös University Lendület Hot Universe Research Group, Pázmány Péter sétány 1/A, Budapest, 1117, Hungary; Department of Theoretical Physics and Astrophysics, Faculty of Science, Masaryk University, Kotlářská 2, Brno, 611 37, Czech Republic; School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
  74. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305, USA; Department of Physics, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305, USA
  75. National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Publication Date:
Grant/Contract Number:
AC02-76SF00515; 15J02737; 15H00773; 15H00785; 15H02090; 15H03639; 15H05438; 15K05107; 15K17610; 15K17657; 16J00548; 16J02333; 16H00949; 16H06342; 16K05295; 16K05296; 16K05300; 16K13787; 16K17672; 16K17673; 21659292; 23340055; 23340071; 23540280; 24105007; 24244014; 24540232; 25105516; 25109004; 25247028; 25287042; 25400236; 25800119; 26109506; 26220703; 26400228; 26610047; 26800102; JP15H02070; JP15H03641; JP15H03642; JP15H06896; JP16H03983; JP16K05296; JP16K05309; JP16K17667; NNX15AC76G; NNX15AE16G; NNX15AK71G; NNX15AU54G; NNX15AW94G; NNG15PP48P; ST/L00075X/1; 340442; ST/J003697/2; PF6-170160
Type:
Accepted Manuscript
Journal Name:
Publications of the Astronomical Society of Japan
Additional Journal Information:
Journal Volume: 70; Journal Issue: 2; Journal ID: ISSN 0004-6264
Publisher:
Astronomical Society of Japan
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
Hitomi Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1458452