3D relativistic MHD simulations of the gamma-ray binaries

IF 4.5 3区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Publications of the Astronomical Society of Australia Pub Date : 2024-09-18 DOI:10.1017/pasa.2024.52

Maxim Barkov, Evgeniy Kalinin, Maxim Lyutikov

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引用次数: 0

Abstract

In gamma-ray binaries neutron star is orbiting a companion that produces a strong stellar wind. We demonstrate that observed properties of ‘stellar wind’–‘pulsar wind’ interaction depend both on the overall wind thrust ratio, as well as more subtle geometrical factors: the relative direction of the pulsar’s spin, the plane of the orbit, the direction of motion, and the instantaneous line of sight. Using fully 3D relativistic magnetohydrodynamical simulations we find that the resulting intrinsic morphologies can be significantly orbital phase-dependent: a given system may change from tailward-open to tailward-closed shapes. As a result, the region of unshocked pulsar wind can change by an order of magnitude over a quarter of the orbit. We calculate radiation maps and synthetic light curves for synchrotron (X-ray) and inverse-Compton emission (GeV-TeV), taking into account

$\gamma $

–

$\gamma $

absorption. Our modelled light curves are in agreement with the phase-dependent observed light curves of LS5039.

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伽马射线双星的 3D 相对 MHD 模拟

在伽马射线双星中，中子星环绕着产生强大恒星风的伴星运行。我们证明，观测到的 "恒星风"-"脉冲星风 "相互作用的特性既取决于总体风推力比，也取决于更微妙的几何因素：脉冲星自旋的相对方向、轨道平面、运动方向和瞬时视线。通过使用全三维相对论磁流体力学模拟，我们发现由此产生的内在形态可能与轨道相位有很大关系：一个给定的系统可能会从尾向开（tailward-open）形态变为尾向闭（tailward-closed）形态。因此，在四分之一的轨道上，未受冲击的脉冲星风区域可能会发生数量级的变化。我们计算了同步辐射（X射线）和反康普顿辐射（GeV-TeV）的辐射图和合成光曲线，同时考虑了$\gamma $ - $\gamma$吸收。我们模拟的光变曲线与观测到的 LS5039 的相变光变曲线一致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Publications of the Astronomical Society of Australia 地学天文-天文与天体物理

CiteScore

5.90

自引率

9.50%

发文量

审稿时长

>12 weeks

期刊介绍： Publications of the Astronomical Society of Australia (PASA) publishes new and significant research in astronomy and astrophysics. PASA covers a wide range of topics within astronomy, including multi-wavelength observations, theoretical modelling, computational astronomy and visualisation. PASA also maintains its heritage of publishing results on southern hemisphere astronomy and on astronomy with Australian facilities. PASA publishes research papers, review papers and special series on topical issues, making use of expert international reviewers and an experienced Editorial Board. As an electronic-only journal, PASA publishes paper by paper, ensuring a rapid publication rate. There are no page charges. PASA''s Editorial Board approve a certain number of papers per year to be published Open Access without a publication fee.