论文标题

潮汐剥离限制

Tidal Stripping in the Adiabatic Limit

论文作者

Stücker, Jens, Ogiya, Go, Angulo, Raul E., Aguirre-Santaella, Alejandra, Sánchez-Conde, Miguel A.

论文摘要

我们提出了一个经历绝热潮汐剥离过程的光环残留物的模型。我们表明,该模型恰好再现了NFW光环的残留物,该模型暴露于缓慢增加的各向同性潮汐场,大约在各向异性潮汐场中。该模型可用于预测轨道亚李的渐近质量损失极限,仅作为subhalo的初始结构的函数和围角处的潮汐场的值。可以轻松地对具有或没有巴属组件的不同浓缩宿主途径进行预测,这些宿主在有或没有重的宿主中,这些宿主在洋流半径和潮汐场之间的关系最为不同。该模型正确预测了几种经验测量的关系,例如“潮汐轨道”和``轨道频率关系'',这些关系是Errani&Navarro(2021)在等温球的情况下报告的。此外,我们提出了“结构潮汐”退化的应用,这意味着增加subhalo的浓度对潮汐剥离的影响与降低潮汐场的幅度完全相同。除此之外,我们发现与潮汐剥离的NFW光环相对于在最大圆速度的半径上测得的量相关的潮汐剥离的NFW光环的结合质量,截断半径,wimp灭的光度和潮汐比。最后,我们注意到,当绝热地暴露于任意大小的潮汐场时,NFW光环不能完全破坏。我们提供了模型的开源实施,并建议它可以用于改善暗物质歼灭的预测。

We present a model for the remnants of haloes that have gone through an adiabatic tidal stripping process. We show that this model exactly reproduces the remnant of an NFW halo that is exposed to a slowly increasing isotropic tidal field and approximately for an anisotropic tidal field. The model can be used to predict the asymptotic mass loss limit for orbiting subhaloes, solely as a function of the initial structure of the subhalo and the value of the tidal field at pericentre. Predictions can easily be made for differently concentrated host-haloes with and without baryonic components, which differ most notably in their relation between pericentre radius and tidal field. The model correctly predicts several empirically measured relations such as the `tidal track' and the `orbital frequency relation' that was reported by Errani & Navarro (2021) for the case of an isothermal sphere. Further, we propose applications of the `structure-tide' degeneracy which implies that increasing the concentration of a subhalo has exactly the same impact on tidal stripping as reducing the amplitude of the tidal field. Beyond this, we find that simple relations hold for the bound mass, truncation radius, WIMP annihilation luminosity and tidal ratio of tidally stripped NFW haloes in relation to quantities measured at the radius of maximum circular velocity. Finally, we note that NFW haloes cannot be completely disrupted when exposed adiabatically to tidal fields of arbitrary magnitudes. We provide an open-source implementation of our model and suggest that it can be used to improve predictions of dark matter annihilation.

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