The structural evolution of galaxies with both thin and thick discs

The structural evolution of galaxies with both thin and thick discs
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薄盘和厚盘星系的结构演化

DOI:
10.1093/mnras/stx1300
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发表时间:
2017
影响因子:
4.8
通讯作者:
Aumer M
Aumer M
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Aumer M

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我们进行controlledN-体模拟盘星系内的活暗物质(DM)晕,以现今的星系,包含薄和厚光盘。我们考虑两种类型的模型:(a)厚盘的初始条件,近圆轨道上的恒星连续增加超过100 Gyr,和(B)模型中,恒星的出生速度色散在相同的时间尺度上连续减少。我们表明,这两个计划产生的双指数垂直配置文件类似的银河系(MW)。我们指出如何空间年龄结构的星系可以用来区分的情况。我们发现,厚光盘的存在显着改变和延迟酒吧的形成,从而使可能的模型与现实baranda高重子DM质量比的中心区域,所需的微透镜约束。我们研究如何在恒星和DM的径向质量分布是由光盘的增长和非轴对称的影响。我们讨论了如何酒吧屈曲形状的薄和厚盘星在酒吧区域的垂直年龄分布。在何种程度上的结合观察动机的内-外生长的历史和宇宙学动机的暗晕属性导致自发形成的非轴对称,转向模型对当今MW类星系是值得注意的。
We perform controlledN-body simulations of disc galaxies growing within live dark matter (DM) haloes to present-day galaxies that contain both thin and thick discs. We consider two types of models: (a) thick-disc initial conditions to which stars on near-circular orbits are continuously added over ∼10 Gyr, and (b) models in which the birth velocity dispersion of stars decreases continuously over the same time-scale. We show that both schemes produce double-exponential vertical profiles similar to that of the Milky Way (MW). We indicate how the spatial age structure of galaxies can be used to discriminate between scenarios. We show that the presence of a thick disc significantly alters and delays bar formation and thus makes possible models with a realistic baranda high baryon-to-DM mass ratio in the central regions, as required by microlensing constraints. We examine how the radial mass distribution in stars and DM is affected by disc growth and non-axisymmetries. We discuss how bar buckling shapes the vertical age distribution of thin- and thick-disc stars in the bar region. The extent to which the combination of observationally motivated inside-out growth histories and cosmologically motivated dark halo properties leads to the spontaneous formation of non-axisymmetries that steer the models towards present-day MW-like galaxies is noteworthy.
DOI: 10.1093/mnras/stx273
发表时间: 2017
影响因子: 4.8
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发表时间: 2016
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