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- National Center for Theoretical SciencesTW84 papers
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10 papers · 1 filter
X-ray properties of G308.3-1.4 and its central compact object
K. A. Seo, C. Y. Hui, R. H. H. Huang +4
We present a short Chandra observation that confirms a previous unidentified extended X-ray source, G308.3-1.4, as a new supernova remnant (SNR) in the Milky Way. Apart from identi…
Launching and Quenching of Black Hole Relativistic Jets at Low Accretion Rate
Hung-Yi Pu, Kouichi Hirotani, Hsiang-Kuang Chang
Relativistic jets are launched from black hole (BH) X-ray binaries and active galactic nuclei when the disk accretion rate is below a certain limit (i.e., when the ratio of the acc…
Energy dependence of Normal Branch Oscillation in Scorpius X-1
J. Wang, H. -K. Chang, C. -Y. Liu
We report the energy dependence of normal branch oscillations (NBOs) in Scorpius X-1, a low-mass X-ray binary Z-source. Three characteristic quantities (centroid frequency, quality…
Fermi Large Area Telescope observations of GRB 110625A
P. H. Thomas Tam, Albert K. H. Kong, Yi-Zhong Fan
Gamma-ray bursts (GRBs) that emit photons at GeV energies form a small but significant population of GRBs. However, the number of GRBs whose GeV-emitting period is simultaneously o…
Monitoring Variable X-ray Sources in Nearby Galaxies
Albert K. H. Kong
In the last decade, it has been possible to monitor variable X-ray sources in nearby galaxies. In particular, since the launch of Chandra, M31 has been regularly observed. It is pe…
Long-term X-ray Variability Study of IC342 from XMM-Newton Observations
Daisy S. Y. Mak, Chun S. J. Pun, Albert K. H. Kong
We presented the results of an analysis of four XMM-Newton observations of the starburst galaxy IC342 taken over a four-year span from 2001 to 2005, with an emphasis on investigati…