Zobrazeno 21 - 30
of 122
pro vyhledávání: '"Chang, Heon-Young"'
Autor:
Han, Cheongho, Chang, Heon-Young
Publikováno v:
Mon.Not.Roy.Astron.Soc. 338 (2003) 637
Recently, from the Hubble Space Telescope (HST) images of one of the Large Magellanic Cloud (LMC) events taken 6.3 years after the original lensing measurement, Alcock et al. were able to directly image the lens. Although the first resolved lens was
Externí odkaz:
http://arxiv.org/abs/astro-ph/0209352
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 been suggested that supermassive black hole masses can be estimated f
Externí odkaz:
http://arxiv.org/abs/astro-ph/0207154
Autor:
Chang, Heon-Young
The principal aim of observational helioseismology is to determine mode parameters of the solar oscillations as accurately as possible. Yet estimates of the mode parameters are subject to many sources of noise, including inevitable gaps in data, stoc
Externí odkaz:
http://arxiv.org/abs/astro-ph/0203097
We have studied the long-term X-ray light curve (2$-$10 keV) of the luminous Seyfert 1 galaxy MCG-2-58-22 by compiling data, from various X-ray satellites, which together cover more than 20 years. We have found two distinct types of time variations i
Externí odkaz:
http://arxiv.org/abs/astro-ph/0201300
Autor:
Chang, Heon-Young, Han, Cheongho
Publikováno v:
Mon.Not.Roy.Astron.Soc. 335 (2002) 195
We investigate the pattern of anomalies in the light curves of caustic-crossing binary microlensing events induced by spot(s) on the lensed source star. For this purpose, we perform simulations of events with various models of spots. From these simul
Externí odkaz:
http://arxiv.org/abs/astro-ph/0201121
We investigate consequences of a continuously energy-injecting central engine of gamma-ray burst (GRB) afterglow emission, assuming that a highly magnetized pulsar is left beaming in the core of a GRB progenitor. Beaming and continuous energy-injecti
Externí odkaz:
http://arxiv.org/abs/astro-ph/0110640
We propose a redshift estimator for the long ($T_{90} > 20$) gamma-ray bursts (GRBs) observed by the BATSE. It is based on an empirical relation between the redshift and the power-law index of power density spectra (PDSs) of the observed GRBs. This r
Externí odkaz:
http://arxiv.org/abs/astro-ph/0108441
Publikováno v:
Mon.Not.Roy.Astron.Soc. 328 (2001) 986
In this paper, we show that the pattern of microlensing light curve anomalies induced by multiple planets are well described by the superposition of those of the single-planet systems where the individual planet-primary binary pairs act as independen
Externí odkaz:
http://arxiv.org/abs/astro-ph/0107517
Autor:
Chang, Heon-Young
We study the power density spectrum (PDS) of light curves of the observed gamma-ray bursts (GRBs) to search for a direct signature for cosmological time dilation in the PDS statistics with the GRBs whose redshifts $z$'s are known. The anticorrelation
Externí odkaz:
http://arxiv.org/abs/astro-ph/0106220
Autor:
Chang, Heon-Young, Han, Cheongho
Publikováno v:
Mon.Not.Roy.Astron.Soc. 327 (2001) 397
Gaudi & Gould (1997) showed that close companions of remote binary systems can be efficiently detected by using gravitational microlensing via the deviations in the lensing light curves induced by the existence of the lens companions. In this paper,
Externí odkaz:
http://arxiv.org/abs/astro-ph/0105187