摘要
X-ray dim isolated neutron stars are peculiar pulsar-like objects,characterized by their Planck-like spectrum.In studying their spectral energy distributions,optical/ultraviolet(UV) excess is a long standing problem.Recently Kaplan et al.measured the optical/UV excess for all seven sources,which is understandable in the resonant cyclotron scattering(RCS) model previously addressed.The RCS model calculations show that the RCS process can account for the observed optical/UV excess for most sources.The ?at spectrum of RX J2143.0+0654 may be due to contributions from the bremsstrahlung emission of the electron system in addition to the RCS process.
X-ray dim isolated neutron stars are peculiar pulsar-like objects, characterized by their Planck-like spectrum. In studying their spectral energy distributions, optical/ultraviolet (UV) excess is a long standing problem. Recently Kaplan et al. measured the optical/UV excess for all seven sources, which is understandable in the resonant cyclotron scattering (RCS) model previously addressed. The RCS model calculations show that the RCS process can account for the observed optical/UV excess for most sources. The flat spectrum of RX J2143.0+0654 may be due to contributions from the bremsstrahlung emission of the electron system in addition to the RCS process.
基金
supported by the National Natural Science Foundation of China (NSFC, GrantNos. 10935001 and 10973002)
the National Basic Research Program of China (973 Program, Grant No. 2009CB824800)
the John Templeton Foundation
关键词
回旋加速器
散射模型
共振散射
紫外线
中子星
光学
孤立
光谱能量分布
pulsars: individual (RX J0420.0-5022, RX J0720.4-3125, RX J0806.4-4123, RX J1308.6+2127, RX J1605.3+3249, RX J1856.5-3754, RX J2143.0+0654)-- stars: neutron