SIRIUS project. II. A new tree-direct hybrid code for smoothed particle hydrodynamics/<i>N</i>-body simulations of star clusters

SIRIUS project. II. A new tree-direct hybrid code for smoothed particle hydrodynamics/<i>N</i>-body simulations of star clusters
复制标题

天狼星项目。

DOI:
10.1093/pasj/psab037
复制
发表时间:
2021
影响因子:
2.3
通讯作者:
Hirai Yutaka
Hirai Yutaka
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Fujii Michiko S;Saitoh Takayuki R;Wang Long;Hirai Yutaka

文献摘要

参考文献

被引文献

相似文献

星星团的形成是通过分子云内聚集星星的形成。为了理解早期阶段星星团的动力学演化,其中它们仍然嵌入在周围的气体中,我们需要精确积分单个恒星轨道,而不需要在包括气体和恒星的系统中进行引力软化,以及用真实的质量函数对单个恒星进行建模。我们开发了一个新的树直接混合光滑粒子流体动力学/N体代码,ASURABRIDGE,其中恒星集成使用directN体计划或PeTar,粒子粒子树计划代码,没有重力软化。在ASURABRIDGE中,假设恒星的质量是从给定的初始质量函数中随机抽取的。用这个程序,我们从分子云开始模拟没有引力软化的星星团的形成。我们发现,当我们不使用软化时,星星团中心由于软化而产生的人造致密核消失了。我们进一步证明了星星团是由更小的星团合并而成的。在我们的模拟中形成的星星团包括一些动态形成的双星,其最小半长轴为几个Au,并且对于质量更大的恒星,双星比例更高。
Star clusters form via clustering star formation inside molecular clouds. In order to understand the dynamical evolution of star clusters in their early phase, in which they are still embedded in their surrounding gas, we need accurate integration of individual stellar orbits without gravitational softening in the systems including both gas and stars, as well as modeling of individual stars with a realistic mass function. We develop a new tree-direct hybrid smoothed particle hydrodynamics/N-body code, ASURABRIDGE, in which stars are integrated using a directN-body scheme orPeTar, a particle–particle particle-tree scheme code, without gravitational softening. In ASURABRIDGE, stars are assumed to have masses randomly drawn from a given initial mass function. With this code, we perform star cluster formation simulations starting from molecular clouds without gravitational softening. We find that artificial dense cores in star cluster centers due to the softening disappear when we do not use softening. We further demonstrate that star clusters are built up via mergers of smaller clumps. The star clusters formed in our simulations include some dynamically formed binaries with minimum semi-major axes of a few au, and the binary fraction is higher for more massive stars.
走向星系形成的第一原理模拟:一、盘状星系高分辨率模拟中我们应该如何选择恒星形成标准?
DOI: --
发表时间: 2008
期刊:
影响因子: --
作者:
Takayuki R.Saitoh;H. Daisaka;E. Kokubo;J. Makino;T. Okamoto;K. Tomisaka;K. Wada;N. Yoshida
通讯作者: N. Yoshida
DOI: 10.1088/0004-637x/746/1/15
发表时间: 2011-11
期刊: The Astrophysical Journal
影响因子: --
作者:
S. Banerjee;P. Kroupa;Seungkyung Oh
通讯作者: S. Banerjee;P. Kroupa;Seungkyung Oh
DOI: 10.1111/j.1365-2966.2011.20137.x
发表时间: 2011
影响因子: 4.8
作者:
F. I. Pelupessy;S. Zwart
通讯作者: S. Zwart
DOI: 10.1093/pasj/61.3.481
发表时间: 2008-05
影响因子: 2.3
作者:
Takayuki R.Saitoh;H. Daisaka;E. Kokubo;J. Makino;T. Okamoto;K. Tomisaka;K. Wada;N. Yoshida
通讯作者: Takayuki R.Saitoh;H. Daisaka;E. Kokubo;J. Makino;T. Okamoto;K. Tomisaka;K. Wada;N. Yoshida
DOI: 10.1086/341347
发表时间: 2002-08
期刊: The Astrophysical Journal
影响因子: --
作者:
T. Onishi;A. Mizuno;A. Kawamura;K. Tachihara;Y. Fukui
通讯作者: T. Onishi;A. Mizuno;A. Kawamura;K. Tachihara;Y. Fukui