arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.11035astro-ph.HE
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磁化中子星外层的三维传热效应

Three-dimensional heat transfer effects in external layers of a magnetized neutron star

Ilya A. Kondratyev, Sergey G. Moiseenko, Gennady S. Bisnovatyi-Kogan, Maria V. Glushikhina

摘要:

确定中子星(NS)表面的磁场结构是现代天体物理学的一个重要问题。在强磁场存在下,简并物质的热导率是各向异性的。在本文中,我们提出了三维各向异性的热传导模拟磁化NS外层,并构建合成热光变曲线。我们采用了不同于以往的电子张量导热系数,由Boltzmann方程的Chapman-Enskog方法的解析解导出。在偶极加四极磁场作用下,得到了NS表面温度分布。我们考虑的情况下,其中的磁偶极子和四极分量的磁场的磁轴不对齐。为了研究这些领域的观测表现,我们已经产生了热光变曲线的温度分布使用复合黑体模型。结果表明,最简单的非共轴偶极加四极磁场分布(四极分量中只有零阶球函数)可以显著影响热光变曲线,使脉冲轮廓不对称,并与纯偶极场相比放大脉动。

英文摘要:

Determination of a magnetic field structure on a neutron star (NS) surface is an important problem of a modern astrophysics. In a presence of strong magnetic fields a thermal conductivity of a degenerate matter is anisotropic. In this paper we present 3D anisotropic heat transfer simulations in outer layers of magnetized NSs, and construct synthetic thermal light curves. We have used a different from previous works tensorial thermal conductivity coefficient of electrons, derived from the analytical solution of the Boltzmann equation by the Chapman-Enskog method. We have obtained a NS surface temperature distribution in presence of dipole-plus-quadrupole magnetic fields. We consider a case, in which magnetic axes of a dipole and quadrupole components of the magnetic field are not aligned. To examine observational manifestations of such fields we have generated thermal light curves for the obtained temperature distributions using a composite black-body model. It is shown, that the simplest (only zero-order spherical function in quadrupole component) non-coaxial dipole-plus-quadrupole magnetic field distribution can significantly affect the thermal light curves, making pulse profiles non-symmetric and amplifying pulsations in comparison to the pure-dipolar field.

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