论文标题

OVI的空间分布覆盖模拟的环境培养基中的分数

Spatial Distribution of OVI Covering Fractions in the Simulated Circumgalactic Medium

论文作者

Marra, Rachel, Churchill, Christopher W., Kacprzak, Glenn G., Vliet, Rachel Vander, Ceverino, Daniel, Lewis, Emmy, Nielsen, Nikole M., Muzahid, Sowgat, Charlton, Jane C.

论文摘要

我们使用自适应网状细化宇宙学模拟来研究围层培养基(CGM)中OVI吸收的空间分布,这是投影病毒半径和方位角的函数。我们将这些模拟与来自多相星系光环调查的53个星系的观察到的样本进行了比较。使用MockSpec(吸收线分析管道),我们生成模拟CGM的合成类星体吸收线观测值。为了最好地模仿观察结果,我们研究了53个视线的平均属性,其分布分布为$ d/r_ {vir} $,并且在统计上与观察结果一致。我们发现,为模拟星系获得的OVI覆盖分数与内部光环的观察值($ d/r_ {vir} \ leq 0.375 $),并且在外部光环中的$1.1σ$内($ d/r_ {vir}> 0.75 $),但在$ 0.375 $ 0.375/r_ $ n $ n $ r_ vic vir n in vic vir n in vic vir。在模拟中未复制观察到的OVI的双峰分布,其方位角覆盖了方位角,显示出沿投影的主要和次要星系的吸收频率,在模拟中没有再现。进一步的分析表明,OVI吸收气体的空间基因分布由内部光环中的流出和流动气体混合在一起,该气体源自光晕中的进一步。尽管单个模拟星系的CGM表现出空间结构,但发生平坦的方位角分布是因为单个模拟星系没有发展从星系到星系的通用的CGM结构。

We use adaptive mesh refinement cosmological simulations to study the spatial distribution and covering fraction of OVI absorption in the circumgalactic medium (CGM) as a function of projected virial radius and azimuthal angle. We compare these simulations to an observed sample of 53 galaxies from the Multiphase Galaxy Halos Survey. Using Mockspec, an absorption line analysis pipeline, we generate synthetic quasar absorption line observations of the simulated CGM. To best emulate observations, we studied the averaged properties of 15,000 "mock samples" each of 53 sightlines having a distribution of $D/R_{vir}$ and sightline orientation statistically consistent with the observations. We find that the OVI covering fraction obtained for the simulated galaxies agrees well with the observed value for the inner halo ($D/R_{vir} \leq 0.375$) and is within $1.1σ$ in the outer halo ($D/R_{vir} > 0.75$), but is underproduced within $0.375 < D/R_{vir} \leq 0.75$. The observed bimodal distribution of OVI covering fraction with azimuthal angle, showing higher frequency of absorption along the projected major and minor axes of galaxies, is not reproduced in the simulations. Further analysis reveals the spatial-kinematic distribution of OVI absorbing gas is dominated by outflows in the inner halo mixed with a inflowing gas that originates from further out in the halo. Though the CGM of the individual simulated galaxies exhibit spatial structure, the flat azimuthal distribution occurs because the individual simulated galaxies do not develop a CGM structure that is universal from galaxy to galaxy.

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