Jammed keplerian gas leads to the formation and disappearance of spiral arms in a coupled map lattice for astronomical objects
Jammed keplerian gas leads to the formation and disappearance of spiral arms in a coupled map lattice for astronomical objects
复制标题
DOI：
10.1093/ptep/ptad064
复制
发表时间：
2021-09
影响因子：
3.5
通讯作者：
Erika Nozawa
中科院分区：
文献类型：
--
作者：
Erika Nozawa
通过关注耦合图晶格 (CML) 中的堵塞开普勒气体，并使用模拟天体中不同模式的最小程序集来研究旋臂的形成和消失。 CML 表明，旋臂是一种交通堵塞，其运动受堵塞气体流入和流出的控制。特别是，我们提出了一种简单直接评估旋臂消失的新方法，称为“轻进重出”。它是基于轻流入和重流出之间的气体流量差导致交通拥堵消失。此外，我们提出了旋臂剩余寿命的近似公式，该公式直接从“轻入重出”方法推导出来，而无需像传统差动旋转那样计算其模式速度。所提出的公式已成功应用于 CML 模拟。
The formation and disappearance of spiral arms are studied by focusing on jammed Keplerian gas in a coupled map lattice (CML) with a minimal set of procedures for simulating diverse patterns in astronomical objects. The CML shows that a spiral arm is a type of traffic jam, and its motion is governed by both a gas inflow into and outflow from the jam. In particular, we present a new approach to simply and directly evaluating the disappearance of spiral arms, called “light-in and heavy-out”. It is based on the gas flow rate difference between the light inflow and heavy outflow leading to the disappearance of traffic jams. Furthermore, we propose an approximate formula for the remaining lifetime of spiral arms, which is immediately derived from the “light-in and heavy-out” approach without calculating their pattern speeds as in conventional differential rotation. The proposed formula is successfully applied to the CML simulations.