论文标题

超音速项目:Sigos和DM Ghosts的偏心和旋转支持

The Supersonic Project: The eccentricity and rotational support of SIGOs and DM GHOSts

论文作者

Williams, Claire E., Naoz, Smadar, Lake, William, Chiou, Yeou S., Burkhart, Blakesley, Marinacci, Federico, Vogelsberger, Mark, Chiaki, Gen, Nakazato, Yurina, Yoshida, Naoki

论文摘要

在重组时,暗物质(DM)和重子(DM)(DM)(流速度)之间的超音速相对速度会在早期宇宙中引起低质量对象的形成。我们扩大了“超音速项目”纸系列的范围,以包括对象,我们称之为暗物质 +气体晕圈被流媒体(DM Ghosts)抵消 - 弥漫性,DM富集的结构是由于DM质量中心之间的物理偏移而形成的。我们提出了对使用AREPO代码在高分辨率的流体动力模拟中,对DM幽灵和超级诱导的气体对象(包括分子冷却的影响)进行了更新的数值研究。通过对其椭圆形引力潜力的分析理解,我们研究了这些物体的种群级特性,这些特性表征了它们的形态,自旋,径向质量和速度分布,而不是非流域的经典结构。流速度会导致气体和DM成分的球形偏差,并为气体提供更大的旋转支持。低质量($ <\ sim 10^{5.5} $ m $ _ \ odot $)在流的区域中演示类似核心的旋转和质量配置文件。 DM幽灵的旋转和形态中的异常可能代表了与观察到的超生物矮星系的早期宇宙类似物,其DM含量和异常旋转曲线的变化。

A supersonic relative velocity between dark matter (DM) and baryons (the stream velocity) at the time of recombination induces the formation of low mass objects with anomalous properties in the early Universe. We widen the scope of the `Supersonic Project' paper series to include objects we term Dark Matter + Gas Halos Offset by Streaming (DM GHOSts)--diffuse, DM-enriched structures formed because of a physical offset between the centers of mass of DM and baryonic overdensities. We present an updated numerical investigation of DM GHOSts and Supersonically Induced Gas Objects (SIGOs), including the effects of molecular cooling, in high resolution hydrodynamic simulations using the AREPO code. Supplemented by an analytical understanding of their ellipsoidal gravitational potentials, we study the population-level properties of these objects, characterizing their morphology, spin, radial mass, and velocity distributions in comparison to classical structures in non-streaming regions. The stream velocity causes deviations from sphericity in both the gas and DM components and lends greater rotational support to the gas. Low mass ($<\sim 10^{5.5}$ M$_\odot$) objects in regions of streaming demonstrate core-like rotation and mass profiles. Anomalies in the rotation and morphology of DM GHOSts could represent an early Universe analogue to observed ultra-faint dwarf galaxies with variations in DM content and unusual rotation curves.

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