Modelling the baryon cycle in low-mass galaxy encounters: the case of NGC 4490 and NGC 4485

Modelling the baryon cycle in low-mass galaxy encounters: the case of NGC 4490 and NGC 4485
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模拟低质量星系相遇中的重子周期:NGC 4490 和 NGC 4485 的案例

DOI:
10.1093/mnras/sty2052
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发表时间:
2018
影响因子:
4.8
通讯作者:
Kallivayalil, Nitya
Kallivayalil, Nitya
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Pearson, Sarah;Privon, George C;Besla, Gurtina;Putman, Mary E;Martínez-Delgado, David;Johnston, Kathryn V;Gabany, R Jay;Patton, David R;Kallivayalil, Nitya

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低质量星系对和星系群的发现正在增加。研究表明,矮星系对在磁场中富含气体,并表现出高星星形成率,暗示着相互作用。缺乏观测到的矮星系对的动力学模型来解开调节它们重子循环的物理过程。我们提出了新的光学数据和两个孤立的低质量星系(NGC 4490和NGC 4485)之间观测到的潮汐相遇的第一个详细的理论模型。这个系统是一个孤立的类似麦哲伦云的系统,被一个1.50 kpc的扩展Hipenvelope所包围。我们使用混合N体和测试粒子模拟沿着与可视化界面(Identikit),同时再现所观察到的当今形态学和运动学。我们的研究结果表明,两个矮星系之间的反复相遇可以在非常大的距离“公园”重子,没有环境效应的帮助。我们最好的匹配数据是一个8:1的质量比遇到一个单臂螺旋诱导在NGC 4490-模拟,我们假设解释了新的光学数据中呈现的漫射星光的性质。我们预测这对天体将在3.7亿年内完全合并,但扩展的潮汐特征将继续演变,并在3.5亿年后返回到合并后的遗迹。如果这样的矮星对被大质量的宿主吸积,这种重子的预处理将影响气体剥离的效率。相比之下,在孤立的环境中,这项研究展示了矮-矮相互作用如何为合并残余物创造长期的气体供应。
Discoveries of low-mass galaxy pairs and groups are increasing. Studies indicate that dwarf galaxy pairs are gas rich in the field and exhibit elevated star formation rates, suggestive of interactions. Lacking are dynamical models of observed dwarf galaxy pairs to disentangle the physical processes regulating their baryon cycles. We present new optical data and the first detailed theoretical model of an observed tidal encounter between two isolated low-mass galaxies (NGC 4490 and NGC 4485). This system is an isolated analogue of the Magellanic Clouds and is surrounded by a ∼50 kpc extended Hienvelope. We use hybridN-body and test-particle simulations along with a visualization interface (Identikit) to simultaneously reproduce the observed present-day morphology and kinematics. Our results demonstrate how repeated encounters between two dwarf galaxies can ‘park’ baryons at very large distances, without the aid of environmental effects. Our best match to the data is an 8:1 mass ratio encounter where a one-armed spiral is induced in the NGC 4490-analogue, which we postulate explains the nature of diffuse starlight presented in the new optical data. We predict that the pair will fully merge in ∼370 Myr, but that the extended tidal features will continue to evolve and return to the merged remnant over ∼5 Gyr. This pre-processing of baryons will affect the efficiency of gas stripping if such dwarf pairs are accreted by a massive host. In contrast, in isolated environments this study demonstrates how dwarf–dwarf interactions can create a long-lived supply of gas to the merger remnant.
冲压压力剥离造成的气体损失和来自低质量银河系卫星的内部反馈
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