High-Energy X-ray Astrophysics Group

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Hi. I am an assistant professor in the Physics and Astronomy Department at James Madison University (Harrisonburg, VA). I am from Osaka, Japan.

My research expertise is high-energy X-ray astrophysics. I am studying physics of compact objects particularly focusing on various energetic phenomena produced by magnetized gas (plasma) near accretion disks under strong gravity of central black holes from a theoretical standpoint. By constructing semi-analytic models I have been investigating the physical properties of accreting plasma as well as outflows including their geometry and observational signatures that can in principle be spectroscopically detected in UV/X-ray band. My research is relevant for both galactic black hole binaries (i.e. small black holes) and active galactic nuclei at the center of many active galaxies (i.e. supermassive black holes) beyond our own Miky Way Galaxy.

To this end I utilize the well-established theoretical framework called general relativistic magnetohydrodynamics (GRMHD) that describes the physical property of plasma in the presence of external magnetic fields under strong gravity. By numerically solving the MHD equations along with other conditions appropriate under the extreme environment, one can obtain interesting insights into its observational consequences from such plasma in "distorted" spacetime. While spending more time building models from the first principle, I also take advantage of the state-of-the-art data obtained with a number of space-born X-ray observatories as international missions; namely, Suzaku, Chandra, XMM-Newton. Finally, I also collaborate with observers across the globe to further develop physically more reliable models. For that matter, rigorous comparison with the latest data is indeed crucial for theoretical work.

To be specific, I am currently interested in

  1. Magnetically-driven accretion-disk wind in X-ray
  2. X-ray soft-excess from shocked accreting plasma
  3. Broad Fe line reverberation in response to an X-ray source
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