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arXiv 1004.4720astro-ph.HE
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X射线脉冲星剖面分析:EXO 2030+375的几何结构和束斑图

Analyzing X-Ray Pulsar Profiles: Geometry and Beam Pattern of EXO 2030+375

Manami Sasaki, Dmitry Klochkov, Ute Kraus, Isabel Caballero, Andrea Santangelo

摘要:

瞬态Be/X射线双星EXO 2030+375的脉冲轮廓显示出强烈的能量依赖性,以及对它的光度状态,并在形状上是不对称的。我们想要识别脉冲发射中两个磁极的发射成分,以了解中子星的几何形状及其光束模式。我们利用脉冲轮廓分解方法,使我们能够找到两个对称的脉冲轮廓从磁极的中子星。这些单极脉冲轮廓的对称性特征给出了关于中子星的磁极相对于其旋转轴的位置的信息。通过对脉冲剖面的分解,我们发现了EXO 2030+375中中子星的一种可能的几何结构,这表明在中子星的公转过程中,一个极比另一个极更靠近视线,两极在视界后面消失了一小段时间。相当大一部分辐射来自一个磁极面对观测者时的晕,以及另一个磁极在中子星后面时的吸积流,但引力线弯曲使辐射对我们可见。

英文摘要:

The pulse profiles of the transient Be/X-ray binary EXO 2030+375 show strong dependence on energy, as well as on its luminosity state, and are asymmetric in shape. We want to identify the emission components of the two magnetic poles in the pulsed emission to understand the geometry of the neutron star and its beam pattern. We utilize a pulse-profile decomposition method that enables us to find two symmetric pulse profiles from the magnetic poles of the neutron star. The symmetry characteristics of these single-pole pulse profiles give information about the position of the magnetic poles of the neutron star relative to its rotation axis. We find a possible geometry for the neutron star in EXO 2030+375 through the decomposition of the pulse profiles, which suggests that one pole gets closer to the line of sight than the other and that, during the revolution of the neutron star, both poles disappear behind the horizon for a short period of time. A considerable fraction of the emission arises from a halo while the pole is facing the observer and from the accretion stream of the other pole while it is behind the neutron star, but the gravitational line bending makes the emission visible to us.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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