What drives the evolution of gas kinematics in star-forming galaxies?

What drives the evolution of gas kinematics in star-forming galaxies?
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是什么推动了恒星形成星系中气体运动学的演化?

DOI:
10.1093/mnras/sty2970
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发表时间:
2018
影响因子:
4.8
通讯作者:
Wetzel, Andrew
Wetzel, Andrew
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hung, Chao-Ling;Hayward, Christopher C;Yuan, Tiantian;Boylan-Kolchin, Michael;Faucher-Giguère, Claude-André;Hopkins, Philip F;Kereš, Dušan;Murray, Norman;Wetzel, Andrew

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最近的大型积分场摄谱仪(IFS)观测的一个重要结果是,由恒星形成气体追踪的星系的内禀速度色散随红移而增加。大质量的,旋转主导的盘已经在2002年到位,但它们在动力学上比本地宇宙中的螺旋星系更热。虽然已经提出了几种可能的机制(例如星星形成反馈,气体供应增加或更频繁的星系相互作用),但高红移下速度色散增强的根本驱动力仍然不清楚。我们调查的起源,这种运动学的演变,使用一套宇宙学模拟的火(反馈在现实环境中)项目。虽然IFS测量通常比这些模拟覆盖更宽的恒星质量范围,但模拟的星系显示出内在速度色散(σintr),SFR和之间的趋势与观测一致。在观测和模拟中,在恒星形成的主序上的星系的σ中值从0.00增加到0.01 -1.5,但这种增加的趋势在更高的红移下不太明显。在FIRE模拟中,σ intro在Myr的时间尺度上变化很大。这些变化密切反映了SFR和气体流入速率的时间演变()。通过对σintr、$\skew4\dot{M}_{\rm gas}$和SFR进行交叉相关,我们发现,增加的气体流入导致随后增强的星星形成,σ intr的增强与SFR和σ intr的增加在时间上一致。
One important result from recent large integral field spectrograph (IFS) surveys is that the intrinsic velocity dispersion of galaxies traced by star-forming gas increases with redshift. Massive, rotation-dominated discs are already in place at∼ 2, but they are dynamically hotter than spiral galaxies in the local Universe. Although several plausible mechanisms for this elevated velocity dispersion (e.g. star formation feedback, elevated gas supply, or more frequent galaxy interactions) have been proposed, the fundamental driver of the velocity dispersion enhancement at high redshift remains unclear. We investigate the origin of this kinematic evolution using a suite of cosmological simulations from the FIRE (Feedback In Realistic Environments) project. Although IFS surveys generally cover a wider range of stellar masses than in these simulations, the simulated galaxies show trends between intrinsic velocity dispersion (σintr), SFR, andin agreement with observations. In both observations and simulations, galaxies on the star-forming main sequence have median σintrvalues that increase from∼ 0 to∼ 1–1.5, but this increasing trend is less evident at higher redshift. In the FIRE simulations, σintrcan vary significantly on time-scales ofMyr. These variations closely mirror the time evolution of the SFR and gas inflow rate (). By cross-correlating pairs of σintr, $\skew4\dot{M}_{\rm gas}$, and SFR, we show that increased gas inflow leads to subsequent enhanced star formation, and enhancements in σintrtend to temporally coincide with increases inand SFR.
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