Understanding the effects of geometry and rotation on pulsar intensity profiles
Understanding the effects of geometry and rotation on pulsar intensity profiles
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了解几何和旋转对脉冲星强度分布的影响
DOI：
10.1111/j.1365-2966.2010.16724.x
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发表时间：
2010
影响因子：
4.8
通讯作者：
R. Gangadhara
中科院分区：
文献类型：
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作者：
R. Thomas;Y. Gupta;R. Gangadhara
我们已经开发了一种方法来计算一个典型的脉冲星磁层中的无线电发射区域的可能分布，考虑到观察的几何形状和旋转的中子星星的影响。对于给定的倾角、碰撞角、自旋周期、洛伦兹因子、磁力线常数和观测频率，我们的方法可以估算出粒子轨道的发射高度和曲率半径随旋转相位的变化。此外，使用曲率辐射作为基本的发射机制，我们模拟的无线电强度分布，将观察到从一个给定的发射区域的分布，对于不同的无线电频率和洛伦兹因子的值。我们清楚地表明，旋转效应可以引入显着的不对称性所观察到的无线电配置文件。我们调查的依赖性的轮廓特征上的各种脉冲星参数。我们发现，从一个给定的环场线的辐射可以看到在一个大范围的脉冲宽度，起源于不同的海拔高度，具有不同的光谱强度。优选的发射高度沿沿着离散的场线集需要再现现实的脉冲星配置文件，我们说明了这一点为一个已知的脉冲星。最后，我们展示了我们的模型是如何为核心发射的起源提供可行的解释，也为在一些恒星中观察到的单侧锥提供了可行的解释。
We have developed a method to compute the possible distribution of radio emission regions in a typical pulsar magnetosphere, taking into account the viewing geometry and rotational effects of the neutron star. Our method can estimate the emission altitude and the radius of curvature of particle trajectory as a function of rotation phase for a given inclination angle, impact angle, spin period, Lorentz factor, field line constant and the observation frequency. Further, using curvature radiation as the basic emission mechanism, we simulate the radio intensity profiles that would be observed from a given distribution of emission regions, for different values of radio frequency and Lorentz factor. We show clearly that rotation effects can introduce significant asymmetries into the observed radio profiles. We investigate the dependency of profile features on various pulsar parameters. We find that the radiation from a given ring of field lines can be seen over a large range of pulse longitudes, originating at different altitudes, with varying spectral intensity. Preferred heights of emission along discrete sets of field lines are required to reproduce realistic pulsar profiles, and we illustrate this for a known pulsar. Finally, we show how our model provides feasible explanations for the origin of core emission, and also for one-sided cones which have been observed in some pulsars.
多选通场发射器的研制
DOI：
--
发表时间：
2013
期刊：
影响因子：
--
作者：
H.Mimura;Y.Neo;T.Aoki;T.Yoshida and M.Nagao
通讯作者：
T.Yoshida and M.Nagao