Modelling gamma-ray light curves of phase-aligned millisecond pulsars

Modelling gamma-ray light curves of phase-aligned millisecond pulsars
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相位对准毫秒脉冲星的伽马射线光变曲线建模

DOI:
10.1093/mnras/stx3322
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发表时间:
2018-04
影响因子:
4.8
通讯作者:
Jiang Zejun
Jiang Zejun
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Chang Shan;Zhang Li;Li Xiang;Jiang Zejun

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三颗伽玛射线毫秒脉冲星(MSP):PSR J1939+2134、PSR J1959+2048和PSR J 0034 -0534已被证实在射电和伽玛射线波段具有相位对准的共同特征。利用三维(3D)延迟磁偶极子在扰动磁场作用下的几何(两极焦散)模型和物理外隙模型(修正的3D外隙模型),研究了这些磁悬浮粒子的观测特性。为了得到最佳拟合的模型参数,采用马尔可夫链蒙特卡罗方法,给出了三种MSP的GeV波段光变曲线。我们的计算表明,MSP发射高能光子具有较小的倾角(α = 10°-50°),较大的视角(α = 65°-100°)和较小的扰动因子(ε = −0.15-0.1)。在这两种模型中,描述扰动磁场强度的因子ε均小于零,因此电流感应磁场对磁悬浮粒子的脉冲定位起主导作用。
Three gamma-ray millisecond pulsars (MSPs), PSR J1939+2134, PSR J1959+2048, and PSR J0034-0534, have been confirmed to have a common feature of phase-aligned in radio and gamma-ray bands. With a geometric (two-pole caustic) model and a physical outer gap model (revised 3D outer gap model) in a three dimensional (3D) retarded magnetic dipole with a perturbation magnetic field, the observed features of these MSPs are studied. In order to obtained the best-fitting model parameters, the Markov chain Monte Carlo technique is used and reasonable GeV band light curves for three MSPs are given. Our calculations indicate that MSPs emit high energy photons with smaller inclination angles (α ≈ 10°–50°), larger view angles (ζ ≈ 65°–100°), and smaller perturbation factor (ε ≈ −0.15–0.1). Note that the factor ε, describing the strength of the perturbed magnetic field, is all less than zero in these two models, so the magnetic field caused by current-induced play a leading role in the pulsed location of MSPs.
年轻孤立脉冲星伽马射线发射的相位平均光谱和光度
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发表时间: 2013-02
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