X-ray imaging spectroscopic study of galaxies, galaxy groups, and galaxy clusters;

Dark matter distributions;

First generation objects in the universe and cosmic reionization;

Low-frequency radio experiment and observation

Professor Xu received his Ph.D. degree in Physics in 1998 at Shanghai Jiao Tong University, after he finished his thesis work on X-ray study of galaxy clusters at the University of Tokyo, Japan, as a government exchange student supported by the Monbusho Scholarship. From 2000 to 2001 he worked as a post- doctorial research scientist at Columbia University, USA, and led a high quality X-ray spectroscopic study of the early-type galaxy NGC 4636. His research field covers multi-band study of galaxies and galaxy clusters, low frequency radio experiment and observation of cosmic reionization era and first generation celestial objects, and atomic astrophysics.

1.       Gu, L., Xu, H., Gu, J., Kawaharada, M., Nakazawa, K., Qin, Z., Wang, J., Wang, Y., Zhang, Z., & Makishima, K. Two-phase ICM in the Central Region of the Rich Cluster of Galaxies A1795: A Joint Chandra, XMM-Newton, and Suzaku View 2012, ApJ, 749, 186

 

2.       Wang, J., Xu, H., Gu, J., An, T., Cui, H., Li, J., Zhang, Z., Zheng, Q., & Wu, X.-P. How to Identify and Separate Bright Galaxy Clusters from the Low-frequency Radio Sky 2010, ApJ, 723, 620-633

 

3.       Wang, Y., Xu, H., Gu, L., Gu, J., Qin, Z., Wang, J., Zhang, Z., & Wu, X.-P. A Joint Chandra and XMM-Newton View of Abell 3158: Massive Off-Centre Cool Gas Clump As A Robust Diagnostic of Merger Stage 2010, MNRAS, 403, 1909-1918

 

4.       Zhang, Z., Xu, H., Wang, Y., An, T., Xu, Y., & Wu X.-P. Probing the Mass Distributions in NGC 1407 and Its Associated Group with the X-ray Imaging Spectroscopic and Optical Photometric and Line-strength Indices Data 2007, ApJ, 656, 805-817

 

5.       Xu, Y., Xu, H., Zhang, Z., Kundu, A., Wang, Y., & Wu, X.-P. Chandra Study of X-Ray Point Sources in the Early-Type Galaxy NGC 4552 (M89) 2005, ApJ 631, 809-819

 

6.       Xu, H., Kahn, S. M., Peterson, J. R., Behar, E., Paerels, F. B. S., Mushotzky, R. F., Jernigan, J. G., Brinkman, A. C., & Makishima, K. High-Resolution Observations of the Elliptical Galaxy NGC 4636 with the Reflection Grating Spectrometer on board XMM-Newton 2002, ApJ, 579, 600-606

 

7.       Xu, H., Jin, G., & Wu, X.-P. The Mass-Temperature Relation of 22 Nearby Clusters 2001, ApJ, 553, 78-83

 

8.       Zhang, S., Cui, W., Chen, W., Yao, Y., Zhang, X., Sun, X., Wu, X., & Xu, H. Three-Layered Atmospheric Structure in Accretion Disks around Stellar-Mass Black Holes 2000, Science, 287, 1239-1241

 

9.       Xu, H., Makishima, K., Fukazawa, Y., Ikebe, Y., Kikuchi, K., Ohashi, T., & Tamura, T. Discovery of the Central Excess Brightness in Hard X-Rays in the Cluster of Galaxies Abell 1795 1998, ApJ, 500, 738-749

 

10.   Xu, H., Zhang, S., Chen, J., & You, J. Calculations on the Structure and the Simultaneous Transition Probabilities of Fe+24 And Fe+25, 1995, ApJ, 441, 443