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首页> 外文期刊>The Astrophysical Journal. Letters >Galaxy spin alignment in filaments and sheets: Observational evidence
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Galaxy spin alignment in filaments and sheets: Observational evidence

机译：细丝和薄片中的银河系自旋对准：观察证据

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摘要

The properties of galaxies are known to be affected by their environment. One important question is how their angular momentum reflects the surrounding cosmic web. We use the Sloan Digital Sky Survey to investigate the spin axes of spiral and elliptical galaxies relative to their surrounding filament/sheet orientations. To detect filaments, a marked point process with interactions (the "Bisous model") is used. Sheets are found by detecting "flattened" filaments. The minor axes of ellipticals are found to be preferentially perpendicular to hosting filaments. A weak correlation is found with sheets. These findings are consistent with the notion that elliptical galaxies formed via mergers, which predominantly occurred along the filaments. The spin axis of spiral galaxies is found to align with the host filament, with no correlation between spiral spin and sheet normal. When examined as a function of distance from the filament axis, a much stronger correlation is found in the outer parts, suggesting that the alignment is driven by the laminar infall of gas from sheets to filaments. When compared with numerical simulations, our results suggest that the connection between dark matter halo and galaxy spin is not straightforward. Our results provide an important input to the understanding of how galaxies acquire their angular momentum.
机译：已知星系的属性会受到其环境的影响。一个重要的问题是它们的角动量如何反映周围的宇宙网。我们使用Sloan Digital Sky Survey来调查螺旋星系和椭圆星系相对于其周围细丝/薄片方向的自旋轴。为了检测细丝，使用了具有相互作用的标记点过程（“ Bisous模型”）。通过检测“展平”的细丝可以找到纸张。发现椭圆形的短轴优选垂直于宿主细丝。发现与工作表的相关性较弱。这些发现与通过合并形成的椭圆星系（主要发生在细丝上）的观点是一致的。发现螺旋星系的自旋轴与宿主细丝对齐，螺旋自旋与薄片法线之间没有相关性。当根据与灯丝轴的距离的函数进行检查时，在外部部分发现更强的相关性，这表明排列是由气体从薄板到灯丝的层状进入所驱动的。当与数值模拟进行比较时，我们的结果表明暗物质光晕和星系自旋之间的联系并不简单。我们的结果为理解星系如何获取角动量提供了重要的信息。

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