Studies on High Energy Processes in Astrophysics
Time:2015-08-07 02:19 Source:未知 Author:chenxiaoqing  Click: 1870

Research Content:

Under the support of this fund, we have done researches related to high-energy processes in astrophysics, including gamma-ray bursts, X-ray binaries and supernova remnants, solar high-energy activities and high-energy phenomena in active galaxies. We have made important progress in some of these researches, the highlights of which are shown below:
◆ Gamma-Ray Bursts: We proposed a new model for the central engine of GRB X-ray flares, i.e.X-ray flares can be produced by differentially rotating, millisecond pulsars after the mergers of binary neutron stars. We originally proposed the GRB cosmology study. We proposed that it may be generated by the tidal disruption of a star by an intermediate mass black hole. In this model, the GRB will not be associated with any supernova. The theoretical energy release is also consistent with the observations of GRB 060614. We published a couple of papers on high-energy emission from gamma-ray bursts.
◆ X-ray binaries and supernova remnants: main works include investigations on the formation and evolution of various types of compact star binaries and investigations on the possible influence of supernova fallback disks on the observations of young compact objects. Our Chandra observations of the thermal composite Supernova remnant (SNR) 3C391 reveal a highly clumpy hot-gas structure and derive a uniform spatial temperature and density distribution. We found the synchrotron index softening of the pulsar wind nebula in SNR N157B.
◆ Solar high-energy activities: main works include high Energy Particle Diagnostics based on Optical Spectral Lines. A Mechanism for EIT Waves was Proposed. Improvement of the Magnetic Reconnection Model. Promoting the French-Chinese Space Mission “SMESE”.
◆ High-energy phenomena in galaxies: We present the Spitzer Space Telescope InfraRed Array Camera (IRAC) and Multiband Imaging Photometer (MIPS) observations for a nearby sample of elliptical galaxies. By using the population synthesis models to derive ‘pure’ emission-line spectra for a nearby Seyfert 2 galaxies, we explore the relation between the nuclear nebular components and the stellar population properties.
Principal Investigator:
Prof. Zigao DAI
Major Members:
Mingde DING,
Xiangdong LI,
Yongfeng HUANG,
Yang CHEN,
Qiusheng GU,
Cheng FANG,
Pengfei CHEN,
Xiangyu WANG,
Xinlian LUO,