OHTA, Kouji, D. Sc. (Kyoto Univ.), Astrophysics

Ohta has been working on (1)formation and evolution of galaxies,
especially at high redshifts, (2)cosmological evolution of
AGN/QSOs, and (3)relationship between intense star formation
and AGN/QSO activity.  He observes with optical and NIR telescopes
(Subaru, UH88, KPNO etc) and sometimes with radio telescopes.
He is also involved in constructing  Fibre-Multi-Object Spectrograph
for Subaru telescope.

Recent Papers (2001-2003)

[OII]lambda3727 Emission from the Companion to the Quasar BR 1202-0725 at z=4.7
      K. Ohta, T. Matsumoto, T. Maihara, F. Iwamuro, H. Terada, M. Goto,
      K. Motohara, T. Taguchi, R. Hata, M. Yoshida, M. Iye, C. Simpson, and T.
        Publ. Astron. Soc. Japan, vol. 52, p.557-p.562 (2000)

High Resolution Imaging of Molecular Line Emission from High Redshift QSOs
       C.L. Carilli, K. Kohno, R. Kawabe, K. Ohta, C. Henkel,
          K.M. Menten, M.S. Yun, A. Petric, Y. Tutui
        Astronomical Journal, vol. 123, p.1838-p.1846 (2002)

Lyman Break Galaxies at z = 5: Luminosity Function
    I. Iwata, K. Ohta, N. Tamura, M. Ando, S. Wada, C. Watanabe,
          M. Akiyama, K. Aoki
        Publ. Astron. Soc. Japan, vol. 55, p.415-p.432 (2003)

Optical Identification of the ASCA Medium Sensitivity Survey in the
      Northern Sky: Nature of Hard X-ray Selected Luminous AGNs
       M. Akiyama, Y. Ueda, K. Ohta, T. Takahashi, T. Yamada
        The Astrophysical Journal Supplement Ser. vol. 148, p.275-p.315 (2003)

Cosmological Evolution of the Hard X-ray AGN Luminosity Function
     and the Origin of the Hard X-ray Background
        Y. Ueda, M. Akiyama, K. Ohta, T. Miyaji
        The Astrophysical Journal, vol. 598, p.886-p.908  (2003)

Optical Identification of the ASCA Lynx Deep Survey: An
  Association of Quasi-Stellar Objects and a Supercluster at z=1.3?
        K. Ohta, M. Akiyama, Y. Ueda, T. Yamada, K. Nakanishi,
        G. B. Dalton, Y. Ogasaka, T. Kii, and K. Hayashida
        The Astrophysical Journal, vol. 598, p.210-p.215 (2003)