天体测量技术及应用研究组知识库

小质量X射线双星系统中的辐射涵盖射电到伽马射线波段。通常认为X射线辐射来自吸积盘内区，射电辐射主要由喷流贡献，而紫外、光学以及近红外（UV/OPT/NIR）辐射可能由多种辐射机制贡献。确定X射线双星系统中UV/OPT/NIR辐射的主导机制可以对吸积过程的研究提供非常重要的信息。分析不同波段辐射流量之间的相关性是一种重要的研究方法。前人通过分析UV/OPT/NIR辐射与X射线辐射之间的幂律相关性，研究了UV/OPT/NIR辐射的主要起源。总结了不同源中存在的幂律相关性的观测结果，并介绍了用于解释UV/OPT/NIR辐射起源的理论模型。 

Emission from low-mass X-ray binaries (LMXBs) covers a broad range of energies from radio to γ-rays. X-ray emission is typically thought to radiate from the inner region of an accretion flow, and the radio emission is predominantly contributed by a jet. Radiation observed in the ultraviolet (UV), optical (OPT), and near-infrared (NIR) bands may, however, involve a variety of emitting mechanisms. Pinning down the dominant mechanism producing UV/OPT/NIR radiation is still a work in progress. Studying the correlations between emissions at different energies observed during the outbursts of X-ray binaries can provide us valuable information for our understating towards the accretion processes. Researchers prior to us have investigated possible origins of UV/OPT/NIR radiation by analyzing the power-law correlations between UV/OPT/NIR and X-ray. In this paper we review the power-law correlation observed in several X-ray binary sources, and summarize the most probable theoretical models in explaining the origin of the UV/OPT/NIR emission.