期刊
ASTROPHYSICAL JOURNAL
卷 739, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/739/2/63
关键词
dust, extinction; ISM: clouds; ISM: kinematics and dynamics; ISM: molecules; radiative transfer
资金
- Academy of Finland [127015]
- Academy of Finland (AKA) [127015, 127015] Funding Source: Academy of Finland (AKA)
We investigate the uncertainties affecting the temperature profiles of dense cores of interstellar clouds. In regions shielded from external ultraviolet radiation, the problem is reduced to the balance between cosmic ray heating, line cooling, and the coupling between gas and dust. We show that variations in the gas phase abundances, the grain size distribution, and the velocity field can each change the predicted core temperatures by 1 or 2 K. We emphasize the role of non-local radiative transfer effects that often are not taken into account, for example, when modeling the core chemistry. These include the radiative coupling between regions of different temperature and the enhanced line cooling near the cloud surface. The uncertainty of the temperature profiles does not necessarily translate to a significant error in the column density derived from observations. However, depletion processes are very temperature sensitive and a 2 K difference can mean that a given molecule no longer traces the physical conditions in the core center.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据