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41 papers
Radio/X-Ray Luminosity Relation for X-Ray Bright Galactic Nuclei: Implications on Weighing Supermassive Black Hole
Heon-Young Chang, Chul-Sung Choi, Insu Yi
Optically thin and geometrically thick accretion flows are known to be responsible for the observed radio/X-ray luminosity relation of the X-ray bright galactic nuclei. It has also…
Long-Term X-Ray Variabilities of the Seyfert Galaxy MCG-2-58-22 : Secular Flux Decrease and Flares
Chul-Sung Choi, Tadayasu Dotani, Heon-Young Chang +1
We have studied the long-term X-ray light curve (210 keV) of the luminous Seyfert 1 galaxy MCG-2-58-22 by compiling data, from various X-ray satellites, which together cover mor…
Afterglow Light Curve Modulated by a Highly Magnetized Millisecond Pulsar
Heon-Young Chang, Chang-Hwan Lee, Insu Yi
We investigate consequences of a continuously energy-injecting central engine of gamma-ray burst (GRB) afterglow emission, assuming that a highly magnetized pulsar is left beaming…
Observations of Spectral and Time Variabilities from MCG-2-58-22
Chul-Sung Choi, Tadayasu Dotani, Insu Yi +1
We present results from analysis of the X-ray archive data of MCG-2-58-22, acquired with ROSAT from 1991 to 1993 and with ASCA from 1993 to 1997. By analyzing light curves, we find…
Cosmological Evolution Models for QSO/AGN Luminosity Functions: Effects of Spectrum-Luminosity Correlation and Massive Black Hole Remnants
Yun-Young Choi, Jongmann Yang, Insu Yi
We investigate a large number of cosmological evolution models for QSOs and Active Galactic Nuclei (AGN). We introduce a spectrum-luminosity correlation as a new input parameter an…
Relativistic Conic Beams and Spatial Distribution of Gamma-Ray Bursts
Heon-Young Chang, Insu Yi
We study the statistics of gamma-ray bursts, assuming that gamma-ray bursts are cosmological and they are beamed in the form of a conical jet with a large bulk Lorentz factor $\sim…