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Research
I have conducted research into the x-ray variability of active galactic nuclei
(AGN). My senior thesis at the University of Oklahoma focused upon a time
series analysis of an Advanced Satellite for Cosmology and Astronomy (ASCA)
light curve for the galaxy NGC 4395. I modeled the high frequency power
spectrum to determine the cutoff frequency where the slope of the power
spectrum changes from flat to steep via Fourier transform, and completed a
Monte Carlo simulation to account for uneven sampling in the data set. This
key cutoff frequency is believed to be related to the mass of the central
black hole of the galaxy.
In Summer 2007, I worked with Dr. Rene Walterbos studying
gas kinematics of M33. After that, I analyzed the data of NGC 891
to study extraplanr gas of edge-on galaxies.
Meetings
Jan 2008: American Astronomical Society meeting,
May 2005: American Astronomical Society meeting,
Multi-long-slit Spectroscopy for Kinematic Studies I -
Implementation and Demonstration
Rene A.M. Walterbos, J. Choi, S. Cisneros, M. Patterson, C. Wu
Multi-long-slit Spectroscopy for Kinematic Studies II -
Initial Results for Edge-on Galaxies NGC 891 and NGC 4244
Jiehae Choi, S. Cisneros, C. Wu, M. Patterson, R. Walterbos
XMM-Newton Observation of the Second Brightest Quasar PHL 1811
J Choi, K. M. Leighly, & C. Matsumoto
Classes
Future Work
I obtained my M.S. degre in April 2009, and am pursuing a position in industry. My M.S. thesis was entitled Multi-Longslit Spectroscopy for Kinematic Studies.