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Professor    Iguchi, Satoru

Research Field

  • Radio Astronomy, Galaxy Formation, Radio Interferometry

Brief Introduction of Research

       In galaxy formation, it is believed that a giant galaxy is formed as a consequence of numerous galaxy mergers. Almost all galactic centers are assumed to contain a massive black hole. Spiral galaxies, accounting for as much as 70% of the total number of galaxies, contain distinct internal structures: a stellar bulge; a flat, extended rotating disk; spiral arms that extend through the disk; and stellar and dark matter halos. When and how these galactic structures were formed is a perennial mystery being explored in Astronomy and Astrophysics. The supervisor promotes observational studies of 1) black hole mass measurement and binary black holes merger focusing on the coevolution of black holes and galaxies, and of 2) galactic structure formation using radio and optical/infrared astronomical observing data.

       In radio interferometry research, the supervisor studies antenna, receiver, analog device, analog-digital converter, high-speed data transmitter, reference signal generator/stabilizing calibrator, digital device, and the image analysis and calibration methods in aperture synthesis, and carries out the detailed design and development of these radio interferometer subsystems, as well as the design and optimization of the entire system of a radio telescope.

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Main Research Achievements

  • T. Tsukui & S. Iguchi, `` Spiral morphology in an intensely star-forming disk galaxy more than 12 billion years ago,'' Science, vol. 372, pp.1201-1205, 2021.
  • S. Iguchi, A. Gonzalez, T. Kojima, W. Shan, G. Kosugi, S. Asayama, D. Iono, ``How do we design the interferometric system focused on the analog and digital backend and the correlator for scientifically valuable ALMA developments?'' Proc. SPIE 10700, 107002Y, 2018.
  • S. Iguchi and M. Saito, Large aperture millimeter/submillimeter telescope: which is more cost-effective, aperture synthesis telescope versus large single dish telescope? '' Proc. SPIE 9906, 99062T (9pp), 2016.
  • S. Iguchi and D. Iono, ``What are scientifically valuable developments for ALMA enhancement?'' Proc. SPIE 9145, 914520 (8pp), 2014.
  • S. Iguchi and M. Saito, ``Very large millimeter/submillimeter array toward search for 2nd Earth,'' Proc. SPIE 8444, 84443I (7pp), 2012.
  • S. Iguchi, T. Okuda and H. Sudou, ``A Very Close Binary Black Hole in a Giant Elliptical Galaxy 3C 66B and its Black Hole Merger,'' Astrophys. J., vol.724, pp.L166-L170, 2010.
  • S. Iguchi, K. -I. Morita, M. Sugimoto, B. Vila Vilaro, M. Saito, T. Hasegawa, R. Kawabe, K. Tatematsu, S. Sakamoto, H. Kiuchi, S. K. Okumura, G. Kosugi, J. Inatani, S. Takakuwa, D. Iono, T. Kamazaki, R. Ogasawara, M. Ishiguro, ``The Atacama Compact Array (ACA),'' Publ. Astron. Soc. Japan, vol. 61, no. 1, p.1, 2009.
  • S. Iguchi and T. Okuda, ``The FFX Correlator,'' Publ. Astron. Soc. Japan, vol. 60, no. 4, pp.857-869, 2008.
  • S. Iguchi, ``Radio Interferometer Sensitivities for Three Types of Receiving Systems: DSB, SSB and 2SB Systems,'' Publ. Astron. Soc. Japan, vol.57, no. 4, pp.643-678, 2005.
  • S. Iguchi, T. Kurayama, N. Kawaguchi, and K. Kawakami, ``Gigabit Digital Filter Bank: Digital Backend Subsystem in VERA Data Acquisition System,'' Publ. Astron. Soc. Japan, vol.57, no. 1, pp.259-271, 2005.
  • H. Sudou, S. Iguchi, Y. Murata, and Y. Taniguchi, ``Orbital Motion in the Radio Galaxy 3C 66B: Evidence for a Supermassive Black Hole Binary,'' Science, vol. 300, pp.1263-1265, 2003.
  • S. Iguchi and N. Kawaguchi, ``Higher-order Sampling, Over sampling and Digital Filtering Techniques for Radio Astronomy,'' IEICE Trans. Commun, vol.E85-B, no.9, pp.1806-1816, 2002.
  • S. Iguchi, N. Kawaguchi, Y. Murata, H. Kobayashi, K. Fujisawa, and T. Miki, ``Development and Performance of the Real-time VLBI Correlator (RVC),'' IEICE Trans. Commun, vol.E83-B, no.11, pp.102-112, 2000.
  • S. Iguchi, K. Fujisawa, S. Kameno, M. Inoue, Z. Q. Shen, K. Hirotani, and M. Miyoshi, ``Multi-frequency VLBI imaging of OT081,'' Publ. Astron. Soc. Japan, vol.52, no.6, pp.1037-1044, 2000.
  • S. Iguchi, N. Kawaguchi, S. Kameno, H. Kobayashi, and H. Kiuchi, ``Development and Performance of the Terminal System for VLBI Space Observatory Programme (VSOP),'' IEICE Trans. Commun., vol.E83-B, no.2, pp.406-413, 2000.
  • S. Iguchi and N. Kawaguchi, ``The Optimum Filtering in Very-Long-Baseline Interferometry (VLBI),'' IEICE Trans. B, vol.J82-B, no.3, pp.420-426, 1999.

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