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arXiv 2005.14495astro-ph.CO
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强引力透镜的高分辨率宇宙学模拟

A high-resolution cosmological simulation of a strong gravitational lens

Jack Richings, Carlos Frenk, Adrian Jenkins, Andrew Robertson, Matthieu Schaller

摘要:

我们使用EAGLE星系形成模型对10^13 Msun星系群及其环境(维里半径的10倍)进行了宇宙流体动力学模拟。利用一种新的技术来提高暗物质计算的分辨率,而不依赖于气体的分辨率,模拟解决了质量为5 × 10^6 Msun的暗物质晕和亚晕。因此,它是有用的研究的丰度和性质的晕和subhaloes在强透镜测试的冷暗物质模型的目标。我们估计的晕和subhalo质量函数,并讨论它们是如何受到影响的模拟中的重子的列入和环境。我们发现,晕和次晕质量函数在流体动力学模拟比在其暗物质只有对应的振幅较低。这反映了在流体动力学模拟中由于再电离和星系风导致的气体早期损失而导致的晕增长减少,此外,在晕下,由于存在大规模中央星系而导致的宿主晕内潮汐效应增强而导致的中断。晕的分布是高度各向异性的,反映了质量吸积到星系团上的惯性特征。结果,结构的数量随着观察方向而显著变化。当在投影中观察时,当包括重子时,晕中心附近的结构的中值数量减少了两倍。

英文摘要:

We present a cosmological hydrodynamical simulation of a 10^13 Msun galaxy group and its environment (out to 10 times the virial radius) carried out using the EAGLE model of galaxy formation. Exploiting a novel technique to increase the resolution of the dark matter calculation independently of that of the gas, the simulation resolves dark matter haloes and subhaloes of mass 5x10^6 Msun . It is therefore useful for studying the abundance and properties of the haloes and subhaloes targeted in strong lensing tests of the cold dark matter model. We estimate the halo and subhalo mass functions and discuss how they are affected both by the inclusion of baryons in the simulation and by the environment. We find that the halo and subhalo mass functions have lower amplitude in the hydrodynamical simulation than in its dark matter only counterpart. This reflects the reduced growth of haloes in the hydrodynamical simulation due to the early loss of gas by reionisation and galactic winds and, additionally, in the case of subhaloes, disruption by enhanced tidal effects within the host halo due to the presence of a massive central galaxy. The distribution of haloes is highly anisotropic reflecting the filamentary character of mass accretion onto the cluster. As a result, there is significant variation in the number of structures with viewing direction. The median number of structures near the centre of the halo, when viewed in projection, is reduced by a factor of two when baryons are included.

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