X射线双星回旋吸收线研究进展

X射线双星中的回旋共振散射吸收特征(即回旋吸收线特征)是直接测量中子星磁场的工具。回旋吸收线表现为X射线能谱中多阶吸收特征。截至目前,已在30多颗源中探测到该现象,其能量范围为10-80 keV,对应的磁场强度范围为10^7-10^9 T。随着X射线探测技术的进步,回旋吸收线观测及理论研究也迅速发展,包括谐频和基频回旋吸收线能量之比、回旋吸收线形状的复杂性、回旋吸收线形态参数间的相关性、回旋吸收线能量与光度的关系、回旋吸收线的脉冲相位解析谱及回旋吸收线能量的长时标演化等。未来,人们将通过对回旋吸收线的研究,在探测高磁场中子星,以及在探究中子星磁场结构和吸积柱物理等方面取得更多成果。

Investigation Progress of the Cyclotron Resonance Scattering Features in X-ray Binaries

The cyclotron resonance scattering features(CRSFs) in X-ray binaries are tools to directly measure the magnetic field of the neutron stars. CRSFs are the multi-order absorbtion features in the X-ray spectra, and more than 30 sources have been detected. The energy range is 10 ~ 80 keV, corresponding to the magnetic field strength range of 10~7~ 10~9 T. In the past years, the progress of the X-ray detection ability has greatly improved observations and theory of the CRSFs, with the findings including the ratio between the energy of the harmonic and fundamental, the complexity of the cyclotron line shapes, the corrections between the morphological parameters, the correlations between the energy and the X-ray luminosity, the pulse phase resolved spectroscopy and the long term secular evolution of the energy. In the future, the CRSFs will make a contribution to the investigations such as the detection of the high magnetic field, the probe of the magnetic field structure of the neutron star and accretion column physics, and so on.