Toward First-Principle Simulations of Galaxy Formation : II. Shock-Induced Starburst at a Collision Interface during the First Encounter of Interacting Galaxies
Toward First-Principle Simulations of Galaxy Formation : II. Shock-Induced Starburst at a Collision Interface during the First Encounter of Interacting Galaxies
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DOI：
10.1093/pasj/61.3.481
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发表时间：
2008-05
影响因子：
2.3
通讯作者：
Takayuki R.Saitoh;H. Daisaka;E. Kokubo;J. Makino;T. Okamoto;K. Tomisaka;K. Wada;N. Yoshida
中科院分区：
文献类型：
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作者：
Takayuki R.Saitoh;H. Daisaka;E. Kokubo;J. Makino;T. Okamoto;K. Tomisaka;K. Wada;N. Yoshida
我们使用高分辨率N体/SPH模拟研究了相互作用盘星系的演化，同时考虑到星际介质的多相性。在我们的高分辨率模拟中，两个气体盘在第一次相遇时的碰撞界面处自然发生了大规模的恒星爆发，导致了星星团的形成。这与对相互作用星系的观测是一致的。气体密度的概率分布函数（PDF）在星系-星系相遇期间显示出明显的变化。在PDF中，气体盘之间碰撞界面处的气体压缩首先在nH 10 cm 3处出现过量，然后在10 7年的几倍内移动到更高的密度（nH 100 cm 3），在那里发生星暴。后
We investigated the evolution of interacting disk galaxies using high-resolution N -body/SPH simulations, while taking into account the multiphase nature of the interstellar medium. In our high-resolution simulations, a large-scale starburst occurred naturally at the collision interface between two gas disks at the first encounter, resulting in the formation of star clusters. This is consistent with observations of interacting galaxies. The probability distribution function (PDF) of the gas density showed a clear change during the galaxy–galaxy encounter. The compression of gas at the collision interface between the gas disks first appears as an excess at nH � 10 cm � 3 in the PDF, and then it moves to higher densities (nH & 100 cm � 3 ) in a few times 10 7 years, where starburst takes place. After the