Professor NG, Stephen Chi Yung

Current Research

• Astronomy and Astrophysics Group: Observational Astrophysics

  • Dr. Ng studies extreme objects in our Galaxy, including magnetars, energetic pulsars, pulsar wind nebulae (PWNe), and supernova remnants. He has led observational projects using world-class telescopes in X-rays and radio, such as the Chandra X-ray Observatory, XMM-Newton, the Expanded Very Large Array, and the Australia Telescope Compact Array. He has identified a pulsar moving at an enormous velocity over 2,000 km/s. He has also developed a powerful 3D modeling technique to capture the X-ray torus and jet morphology of PWNe and to measure the structure and evolution of the supernova remnant 1987A.

    Dr. Ng's latest research focuses on the magnetic fields of neutron stars and their environments. Employing X-ray observations, he measures the surface temperature of magnetars, which are stars with the strongest magnetic fields in the Universe, to understand their extreme properties and their connection with ordinary radio pulsars. In addition, he maps the magnetic field configurations of PWNe using radio telescopes, in order to probe the cosmic ray production and transport in these systems. Further information can be found at the webpage .

Research Interest

• Radio and X-ray Observations of Neutron Stars

• Pulsar Wind Nebulae

• Supernova Remnants

Representative Publications

• “Radio Study of the Pulsar Wind Nebula Powered by PSR B1706-44”, Liu, Y. H., Ng, C. Y., & Dodson, R., The Astrophysical Journal, 945(1), 82 (2023)
• “High-resolution Radio Study of the Dragonfly Pulsar Wind Nebula Powered by PSR J2021+ 3651.”, Jin, R., Ng, C. Y., Roberts, M. S., & Li, K. L. The Astrophysical Journal, 942(2), 100. (2023)
• “Magnetic Field Structure and Faraday Rotation of the Plerionic Supernova Remnant G21. 5–0.9.”, Lai, P. C., & Ng, C. Y.The Astrophysical Journal, 930(1), 1 (2022)
• “High-frequency radio observations of two magnetars, PSR J1622− 4950 and 1E 1547.0− 5408”, Chu, C. Y., Ng, C. Y., Kong, A. K., & Chang, H. K., Monthly Notices of the Royal Astronomical Society,503(1), 1214-1220 (2021)
• “X-ray and Radio Variabilities of PSR J2032+ 4127 near Periastron.”, Ng, C. Y., Ho, W. C., Gotthelf, E. V., Halpern, J. P., Coe, M. J., Stappers, B. W., & Kerr, M, The Astrophysical Journal, 880(2), 147 (2019)

Awards