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arXiv 0711.0502astro-ph
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反常脉冲星

Anomalous Pulsars

I. F. Malov

摘要:

许多天体物理学家认为,异常X射线脉冲星(AXP)、软伽马射线中继器(SGR)、旋转射电瞬变(RRAT)、致密中心物体(CCO)和X射线暗淡孤立中子星(XDINS)属于不同类别的异常物体,其中以中子星为中心体,导致其所有可观察到的特征。我们在前面已经展示过(I.F.Malov和G.Z.Machabeli,Astron. Astrophys。Trans. 25,7,2006),AXP和SGR可以在中心中子星的通常性质(旋转周期P ~ 0.1 - 1秒,表面磁场B ~ 10^11 - 10^13 G)的命题框架内用漂移模型来描述。在这里,我们将试图表明,所考虑的源的某些差异将由它们的几何形状(特别是由它们的旋转轴和磁轴之间的角度β)来解释。如果BETA < 10 deg. (the对准的旋转器),在中子星磁层外层的漂移波应该在可观测的周期性中起关键作用。对于大的BETA值(近似正交旋转体的情况),来自周围介质(例如,来自遗迹盘)的吸积可以在接收到的辐射中引起一些调制和瞬态事件。

英文摘要:

Many astrophysicists believe that Anomalous X-Ray Pulsars (AXP), Soft Gamma-Ray Repeaters (SGR), Rotational Radio Transients (RRAT), Compact Central Objects (CCO), and X-Ray Dim Isolated Neutron Stars (XDINS) belong to different classes of anomalous objects with neutron stars as the central bodies inducing all their observable peculiarities. We have shown earlier (I.F.Malov and G.Z.Machabeli, Astron. Astrophys. Trans. 25, 7, 2006) that AXPs and SGRs could be described by the drift model in the framework of preposition on usual properties of the central neutron star (rotation periods P ~ 0.1 - 1 sec, surface magnetic fields B ~ 10^11 - 10^13 G). Here we shall try to show that some differences of considered sources will be explained by their geometry (particularly, by the angle BETA between their rotation and magnetic axes). If BETA < 10 deg. (the aligned rotator) the drift waves at the outer layers of the neutron star magnetosphere should play a key role in the observable periodicity. For large values of BETA (the case of the nearly orthogonal rotator) an accretion from the surrounding medium (for example, from the relic disk) can cause some modulation and transient events in received radiation.

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