Dr Takafumi Tsukui

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Research interests

The currently accepted standard model of the universe is the one in which dark energy and dark matter are the major components of the universe, the universe initially experiences an exponential expansion (i.e., Big Bang), and initial density fluctuations are amplified due to self-gravity and grow hierarchically by merging. Observational evidence shows galaxies form the disk structures at some point due to the conservation of angular momentum. Disk galaxies constantly rearrange their mass distributions through the angular momentum transfer or violently change their appearance by the interaction or merging of galaxies. These complex physical processes lead to rich structures of galaxies as we observe today's universe: a central massive black hole, a dense structure of bulge, a flat rotating disk, spiral, and bar structure.

I am interested in problems in galaxy evolution and formation, including:

  1. How do dark matter and baryon distribution evolve?
  2. How do galactic structures form and evolve across cosmic history?
  3. How is star formation regulated? Is there unified law?

I am addressing these questions by carefully measuring and analyzing stellar and gas kinematics obtained by the most advanced telescopes for the galaxies across the 13.8 billion years.

    In particular, the Atacama Large Millimeter/submillimeter Array (ALMA) allow us to detect emission from various atomic and molecular gases (such as carbon, carbon dioxide, oxygen, water, etc.). Such data will enable us to derive the physical properties of the interstellar medium (e.g., dust mass, temperature, gas mass and kinematics, radiation field, etc.) even in the distant galaxies over 12 billion years ago.


    Duffield - Upper - D114