THE ICE THRESHOLD IN MOLECULAR CLOUDS - A DIAGNOSTIC OF THE INFRARED RADIATION-FIELD

被引：46

作者：

WILLIAMS, DA

HARTQUIST, TW

WHITTET, DCB

机构：

[1] MAX PLANCK INST EXTRATERRESTR PHYS,W-8046 GARCHING,GERMANY

[2] RENSSELAER POLYTECH INST,DEPT PHYS,TROY,NY 12180

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1992年 / 258卷 / 03期

关键词：

MOLECULAR PROCESSES; INTERSTELLAR MEDIUM CLOUDS; DUST; EXTINCTION; INTERSTELLAR MEDIUM MOLECULES; INFRARED INTERSTELLAR CONTINUUM;

D O I：

10.1093/mnras/258.3.599

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The threshold extinction at which ice is deposited on dust in molecular clouds is observed to show wide variation from cloud to cloud. The desorption of H2O molecules following absorption at 3 mum is proposed to account for the ice deposition threshold extinction. However, this mechanism is effective only up to H2O monolayer coverage and does not restrict the subsequent ice mantle growth, once started. It is shown that the threshold extinction is a measure of the local infrared radiation field near 3 mum in each cloud.

引用

页码：599 / 601

页数：3