火-2银河系质量星系中暗物质晕的方向

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Jay Baptista, Robyn Sanderson, Dan Huber, Andrew Wetzel, Omid Sameie, Michael Boylan-Kolchin, Jeremy Bailin, Philip F. Hopkins, Claude-André Faucher-Giguere, Sukanya Chakrabarti, Drona Vargya, Nondh Panithanpaisal, Arpit Arora, Emily Cunningham
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引用次数: 0

摘要

暗物质晕的形状和方向对暗物质粒子的微物理特性非常敏感,但在许多质量模型中,银河系暗物质晕的对称轴通常被假设为与恒星盘的对称轴对齐。这对于内部DM光晕来说是很有动力的,但对于外部光晕来说却不是。我们使用来自FIRE-2银河系质量星系Latte组的放大宇宙学重子模拟来探索DM光晕的方向随半径和时间的演变,无论是否与大麦哲伦云类似物发生重大合并,以及当改变DM模型时。在我们研究的四个冷DM晕中,有三个晕的小轴方向偏离恒星盘矢量超过30个星系中心kpc,偏离度超过20°,最大偏离度为30°-90°,这取决于单个晕的形成历史。在相同的模拟中,使用σ = 1 cm 2 g−1的自相互作用DM模型,光晕保持与恒星盘对齐到约200 - 400kpc。与大质量卫星(M≥4 × 10 10 M⊙)的相互作用;M≥3.3 × 10 (10 M⊙)会显著影响晕的方向,使晕的长轴与从盘到星圈半径的卫星星系对齐。如果能够考虑到大质量卫星的影响,那么超过30kpc的光晕和光盘的相对方向是自相互作用DM的潜在诊断。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Orientations of Dark Matter Halos in FIRE-2 Milky Way–mass Galaxies
Abstract The shape and orientation of dark matter (DM) halos are sensitive to the microphysics of the DM particles, yet in many mass models, the symmetry axes of the Milky Way’s DM halo are often assumed to be aligned with the symmetry axes of the stellar disk. This is well motivated for the inner DM halo, but not for the outer halo. We use zoomed-in cosmological baryonic simulations from the Latte suite of FIRE-2 Milky Way–mass galaxies to explore the evolution of the DM halo’s orientation with radius and time, with or without a major merger with a Large Magellanic Cloud analog, and when varying the DM model. In three of the four cold DM halos we examine, the orientation of the halo minor axis diverges from the stellar disk vector by more than 20° beyond about 30 galactocentric kpc, reaching a maximum of 30°–90°, depending on the individual halo’s formation history. In identical simulations using a model of self-interacting DM with σ = 1 cm 2 g −1 , the halo remains aligned with the stellar disk out to ∼200–400 kpc. Interactions with massive satellites ( M ≳ 4 × 10 10 M ⊙ at pericenter; M ≳ 3.3 × 10 10 M ⊙ at infall) affect the orientation of the halo significantly, aligning the halo’s major axis with the satellite galaxy from the disk to the virial radius. The relative orientation of the halo and disk beyond 30 kpc is a potential diagnostic of self-interacting DM, if the effects of massive satellites can be accounted for.
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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