PHYSICAL CONDITIONS IN THE IONIZED GAS OF 30 DORADUS

PHYSICAL CONDITIONS IN THE IONIZED GAS OF 30 DORADUS
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30 DORADUS 电离气体中的物理条件

DOI:
10.1088/0004-637x/694/1/84
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发表时间:
2009
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Indebetouw R
Indebetouw R
中科院分区:
--
文献类型:
--
作者:
Indebetouw R

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我们提出了一个中红外光谱数据立方体的中心部分的30剑鱼座,观察斯皮策的红外光谱仪和多波段成像光度计斯皮策/光谱能量分布模式。检测到芳香尘埃的分子和原子氢的发射特征和发射线,但它们不是特别强。主要的光谱特征是来自氩、氖和硫的中等电离物质的发射线,其用于确定电离气体中的物理条件。电离气体激发在秒差距尺度上表现出强烈的变化,其中一些可能与个别热星有关。我们用光电离模型和冲击模型拟合了离子线强度,发现光电离在该区域占主导地位。电离参数U跟踪中央气泡的边缘,以及突出孤立的电离源和至少一个静止的团块。电离辐射场T rad的硬度揭示了几个”热点”,这些热点要么是个别非常热的恒星的结果,要么是通过周围中性云传播的扩散电离场的痕迹。与其他对巨H ii区的测量结果一致,log(U)的范围在− 3和− 0.75之间,T rad在30,000和85,000 K之间。
We present a mid-infrared spectroscopic data cube of the central part of 30 Doradus, observed with Spitzer's Infrared Spectrograph and Multiband Imaging Photometer for Spitzer/spectral energy distribution mode. Aromatic dust emission features and emission lines from molecular and atomic hydrogen are detected but they are not particularly strong. The dominant spectral features are emission lines from moderately ionized species of argon, neon, and sulfur, which are used to determine the physical conditions in the ionized gas. The ionized gas excitation shows strong variations on parsec scales, some of which can plausibly be associated with individual hot stars. We fit the ionic line strengths with photoionization and shock models, and find that photoionization dominates in the region. The ionization parameter U traces the rim of the central bubble, as well as highlighting isolated sources of ionization, and at least one quiescent clump. The hardness of the ionizing radiation field T rad reveals several" hot spots" that are either the result of individual very hot stars or trace the propagation of the diffuse ionizing field through the surrounding neutral cloud. Consistent with other measurements of giant H ii regions, log (U) ranges between− 3 and− 0.75, and T rad between 30,000 and 85,000 K.
DOI: 10.1086/307971
发表时间: 1999
期刊: The Astrophysical Journal
影响因子: --
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巨型 H II 区域的化学成分和混合:NGC 3603、30 Doradus 和 N66
DOI: --
发表时间: 2007
期刊:
影响因子: --
作者:
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