Shadows behind neutral clumps in photoionized regions

被引：69
作者：
Cantó, J
Raga, A
Steffen, W
Shapiro, PR
机构：
[1] Univ Nacl Autonoma Mexico, Inst Astron, Mexico City 04510, DF, Mexico
[2] Univ Manchester, Dept Phys & Astron, Manchester M13 9PL, Lancs, England
[3] Univ Texas, Dept Astron, Austin, TX 78712 USA
来源：
ASTROPHYSICAL JOURNAL | 1998年 / 502卷 / 02期
关键词：
hydrodynamics; ISM : general; ISM : individual (Helix Nebula); methods : numerical; shock waves; stars : formation;
D O I：
10.1086/305946
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Shadows behind neutral clumps in photoionized regions can have a neutral core surrounded by gas that is photoionized by the diffuse flux produced by the nebula. We present a simple analytic model describing the configuration of such shadows. We also present numerical gasdynamic simulations of the relaxation to the final, steady state. These models have clear applications (e.g., to the cometary knots in the Helix Nebula) but can also be applied in other astrophysical contexts.
引用
收藏
页码：695 / 707
页数：13
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