Mushroom-shaped structures as tracers of buoyant flow in the galactic disk

被引：16

作者：

de Avillez, MA ^{[1
]}

Mac Low, MM ^{[1
]}

机构：

[1] Amer Museum Nat Hist, Dept Astrophys, New York, NY 10024 USA

来源：

ASTROPHYSICAL JOURNAL | 2001年 / 551卷 / 01期

基金：

美国国家科学基金会;

关键词：

galaxy : evolution; galaxy : general; galaxy : structure; hydrodynamics; ISM : structure;

D O I：

10.1086/319842

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent H I emission observations of the southern Galactic hemisphere have revealed a mushroom-like structure extending from z = -70 to -450 pc, composed of a stem and a cap. Similar structures occur in three-dimensional simulations of a dynamic galactic disk driven by isolated and clustered supernovae. Using these simulations, we show that hot gas in the Galactic disk that is not evacuated through chimneys expands into the cooler gas of the thick disk, forming mushroom-shaped structures. This new class of objects traces buoyant flow of hot gas into the thick disk.

引用

页码：L57 / L61

页数：5

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