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Title: Glimpse of the highly obscured HMXB IGR J16318-4848 with Hitomi*

Journal Article · · Publications of the Astronomical Society of Japan
DOI:https://doi.org/10.1093/pasj/psx154· OSTI ID:1458449
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  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. Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, 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, 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, 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 Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
  32. Department of Earth and Space Science, Osaka University, 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
  33. Department of Physics, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
  34. Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan
  35. Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854, USA
  36. Meisei University, 2-1-1 Hodokubo, Hino, Tokyo 191-8506, Japan
  37. SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands; Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
  38. Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  39. Research Institute for Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan
  40. Department of Physics, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
  41. Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
  42. Department of Physics, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
  43. Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
  44. Department of Physics, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan
  45. European Space Astronomy Center, Camino Bajo del Castillo, s/n., 28692 Villanueva de la Cañada, Madrid, Spain
  46. Universities Space Research Association, 7178 Columbia Gateway Drive, Columbia, MD 21046, USA; National Science Foundation, 4201 Wilson Blvd, Arlington, VA 22230, USA
  47. Department of Electronic Information Systems, Shibaura Institute of Technology, 307 Fukasaku, Minuma-ku, Saitama, Saitama 337-8570, Japan
  48. Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan
  49. CEA Saclay, 91191 Gif sur Yvette, France
  50. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
  51. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 452 Lomita Mall, Stanford, CA 94305, USA
  52. Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  53. Department of Physics, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
  54. Department of Physics, University of Wisconsin, Madison, WI 53706, USA
  55. Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario, N2L 3G1, Canada
  56. Department of Astronomy, University of Michigan, 1085 South University Avenue, Ann Arbor, MI 48109, USA
  57. Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Kunigami-gun, Okinawa 904-0495, Japan
  58. Faculty of Liberal Arts, Tohoku Gakuin University, 2-1-1 Tenjinzawa, Izumi-ku, Sendai, Miyagi 981-3193, Japan
  59. Department of Astronomy, University of Maryland, College Park, MD 20742, USA
  60. Faculty of Science, Yamagata University, 1-4-12 Kojirakawa-machi, Yamagata, Yamagata 990-8560, Japan
  61. Department of Physics, Nara Women’s University, Kitauoyanishi-machi, Nara, Nara 630-8506, Japan
  62. Department of Teacher Training and School Education, Nara University of Education, Takabatake-cho, Nara, Nara 630-8528, Japan
  63. Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 6-3 Aramaki-aza-aoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan; Astronomical Institute, Tohoku University, 6-3 Aramakiazaaoba, Aoba-ku, Sendai, Miyagi 980-8578, Japan
  64. Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA
  65. Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
  66. Department of Physics and Mathematics, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
  67. Astronomical Observatory of Jagiellonian University, ul. Orla 171, 30-244 Kraków, Poland
  68. Department of Physics, Yale University, New Haven, CT 06520-8120, USA
  69. Max Planck Institute for extraterrestrial Physics, Giessenbachstrasse 1, 85748 Garching , Germany
  70. Department of Physics, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama, Saitama 338-8570, Japan
  71. NASA, Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA; Department of Astronomy, University of Maryland, College Park, MD 20742, USA
  72. Faculty of Education, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, Shizuoka 422-8529, Japan
  73. Faculty of Health Sciences, Nihon Fukushi University , 26-2 Higashi Haemi-cho, Handa, Aichi 475-0012, Japan
  74. 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
  75. Department of Physics, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA
  76. 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
+ Show Author Affiliations

We report a Hitomi observation of IGR J16318–4848, a high-mass X-ray binary system with an extremely strong absorption of NH ~ 1024 cm-2. Previous X-ray studies revealed that its spectrum is dominated by strong fluorescence lines of Fe as well as continuum emission. For physical and geometrical insight into the nature of the reprocessing material, we utilize the high spectroscopic resolving power of the X-ray microcalorimeter (the soft X-ray spectrometer; SXS) and the wide-band sensitivity by the soft and hard X-ray imager (SXI and HXI) aboard Hitomi. Even though photon counts are limited due to unintended off-axis pointing, the SXS spectrum resolves Fe Kα1 and Kα2 lines and puts strong constraints on the line centroid and width. The line width corresponds to the velocity of $$160_{-70}^{+300}$$ km s-1. This represents the most accurate, and smallest, width measurement of this line made so far from any X-ray binary, much less than the Doppler broadening and shift expected from speeds which are characteristic of similar systems. Combined with the K-shell edge energy measured by the SXI and HXI spectra, the ionization state of Fe is estimated to be in the range of Fe I–IV. Considering the estimated ionization parameter and the distance between the X-ray source and the absorber, the density and thickness of the materials are estimated. The extraordinarily strong absorption and the absence of a Compton shoulder component is confirmed. These characteristics suggest reprocessing materials which are distributed in a narrow solid angle or scattering primarily with warm free electrons or neutral hydrogen. This measurement was achieved using the SXS detection of 19 photons. This provides strong motivation for follow-up observations of this and other X-ray binaries using the X-ray Astrophysics Recovery Mission, and other comparable future instruments.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
Hitomi Collaboration
Grant/Contract Number:
AC02-76SF00515; JP15H00773; JP15H00785; JP15H02070; JP15H02090; JP15H03639; JP15H03641; JP15H03642; JP15H05438; JP15H06896; JP15K05107; JP15K17610; JP15K17657; JP16H00949; JP16H03983; JP16H06342; JP16J02333; JP16K05295; JP16K05300; JP16K05309; JP16K13787; JP16K17667; JP16K17672; JP16K17673; JP17H02864; JP17K05393; JP21659292; JP23340055; JP23340071; JP23540280; JP24105007; JP24540232; JP24684010; JP25105516; JP25109004; JP25247028; JP25287042; JP25400236; JP25800119; JP26109506; JP26220703; JP26400228; JP26610047; JP26670560; JP26800102; NNX15AC76G; NNX15AE16G; NNX15AK71G; NNX15AU54G; NNX15AW94G; NNG15PP48P; ST/L00075X/1; 340442; ST/J003697/2; PF6-170160
OSTI ID:
1458449
Journal Information:
Publications of the Astronomical Society of Japan, Vol. 70, Issue 2; ISSN 0004-6264
Publisher:
Astronomical Society of JapanCopyright Statement
Country of Publication:
United States
Language:
English

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