Dr. Keigo Fukumura

Astrophysics Science Division
NASA/GSFC
Code 663, Gravitational Astrophysics Laboratory
Greenbelt, MD 20771

tel: 301-286-8696
fax: 301-286-1682
e-mail: Keigo.Fukumura @ nasa.gov / fukumura@umbc.edu

Present Position

Research Associate with UMBC/CRESST at NASA/Goddarad Space Flight Center Gravitational Astrophysics Laboratory (Code 663)
Adviser: Dr. Demosthenes Kazanas

Brief Bio

2006-2008 -- NASA Postdoctoral Program (NPP) fellow administered by the Oak Ridge Associated Universities (ORAU)
2005-2006 -- Adjunct Instructor, Montana State University-Bozeman, MT
2004-2006 -- Postdoctoral Researcher, Montana State University-Bozeman, MT

Educational Background

2005 Ph.D. (Physics) -- Department of Physics, Montana State University-Bozeman, MT

Research Interests

Theoretical High Energy X-ray Astrophysics, Active Galactic Nuclei, Compact Objects (Black Hole Physics), Fluid Dynamics

Current Projects

Quasi-Periodic Oscillations (QPOs) from Spinning Black Holes
Magnetohydrodynamic (MHD) Disk-Wind Model
Relativistic Illumination Law from Accretion Disks
General Relativistic Shock Formation in Accretion Flows
Relativistic Iron Fluorescent Line from Accretion Disks

Selected Publications

"XMM-Newton Observations of NGC 4051: Temporal and Spectral Transition to the Faintest Phase in NGC 4051",
Haba, Y., Liebmann, A. C., Fukumura, K., Kunieda, H. & Tsuruta, S. 2008, submitted to PASJ

"Light Echoes in Kerr Geometry: A Source of High Frequency QPOs from Random X-ray Bursts",
Fukumura, K. & Kazanas, D. 2008, ApJ, 679, 1413

"Mass Outflows from Dissipative Shocks in Hot Accretion Flows",
Fukumura, K. & Kazanas, D. 2007, ApJ, 669, 85

"Accretion Disk Illumination in Schwarzschild and Kerr Geometries: Fitting Formulae",
Fukumura, K. & Kazanas, D. 2007, ApJ, 664, 14

"Magnetohydrodynamic Shocks in Non-Equatorial Plasma Flows around a Black Hole", Fukumura K., Takahashi, M., & Tsuruta, S. 2007, ApJ, 656

"Standing Shocks in Transmagnetosonic Accretion Flows onto a Black Hole", Takahashi, M., Goto, J., Fukumura, K., Rilett, D., & Tsuruta, S. 2006, ApJ, 645, 1408

"Iron Kα Fluorescent Line Profiles from Spiral Accretion Flows in Active Galactic Nuclei", Fukumura, K., & Tsuruta, S. ApJ, 2004, 613, 700

"Isothermal Shock Formation in Nonequatorial Accretion Flows around Kerr Black Holes", Fukumura, K., & Tsuruta, S. ApJ, 2004, 611, 964

"Magnetohydrodynamic Shock Conditions for Accreting Plasma onto Kerr Black Holes I", Takahashi, M., Rilett, D., Fukumura, K., & Tsuruta, S. 2002, ApJ, 572, 950

Publications at the ADS website.