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arXiv 2108.01705astro-ph.HEastro-ph.SR
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“蜘蛛”毫秒脉冲双星作为潜在的TeV发射源

"Spider" Millisecond Pulsar Binaries as Potential TeV Emitters

Zorawar Wadiasingh, Christian J. T. van der Merwe, Christo Venter, Alice K. Harding, Matthew G. Baring

摘要:

脉冲星风与外部压力源相互作用是我们银河系中有效和多产的TeV加速器。然而,通过费米-LAT的观测,越来越多的非吸积双星已经出现,这些很可能成为CTA时代的TeV发射体。此类由黑寡妇和红背组成,它们是毫秒脉冲星与其低质量伴星相互作用的双星。在这样的系统中,双星内部的激波可以作为粒子加速和相关的非热辐射的场所形成。我们激励为什么这些来源是特别有趣的了解脉冲星风。我们还描述了我们的新的多区域代码,该代码模拟了X射线和伽马射线同步加速器和逆康普顿光谱分量的选择蜘蛛双星,包括扩散,对流和辐射能量损失的轴对称,稳态的方法。这种新的多区代码同时产生能量依赖的光变曲线和轨道相位分辨光谱。它也更好地限制了电子/正电子对的多样性,这些电子/正电子对已经被加速到TeV能量,并且对于在某些系统中可能观察到的X射线和MeV/GeV波段之间的轨道调制同步辐射组件供电是必要的。这提供了一个更强大的预测预期的高能量和VHE伽马射线通量。附近的MSP与热或燃烧的同伴可能是有前途的目标CTA,它是可能的蜘蛛双星可能有助于所观察到的AMS-02高能正电子过剩。

英文摘要:

Pulsar winds interacting with sources of external pressure are well-established as efficient and prolific TeV accelerators in our Galaxy. Yet, enabled by observations from Fermi-LAT, a growing class of non-accreting pulsars in binaries has emerged and these are likely to become apparent as TeV emitters in the CTA era. This class consists of the black widows and redbacks, binaries in which a millisecond pulsar interacts with its low-mass companion. In such systems, an intrabinary shock can form as a site of particle acceleration and associated nonthermal emission. We motivate why these sources are particularly interesting for understanding pulsar winds. We also describe our new multizone code which models the X-ray and gamma-ray synchrotron and inverse Compton spectral components for select spider binaries, including diffusion, convection, and radiative energy losses in an axially symmetric, steady-state approach. This new multizone code simultaneously yields energy-dependent light curves and orbital-phase-resolved spectra. It also better constrains the multiplicity of electron/positron pairs that have been accelerated up to TeV energies and are necessary to power orbitally-modulated synchrotron emission components between the X-rays and MeV/GeV bands potentially observed in some systems. This affords a more robust prediction of the expected high-energy and VHE gamma-ray flux. Nearby MSPs with hot or flaring companions may be promising targets for CTA, and it is possible that spider binaries could contribute to the observed AMS-02 energetic positron excess.

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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