PHYSICAL CONDITIONS IN THE IONIZED GAS OF 30 DORADUS
PHYSICAL CONDITIONS IN THE IONIZED GAS OF 30 DORADUS
复制标题
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:
影响因子:
--
通讯作者:
Indebetouw R
中科院分区:
文献类型:
--
作者:
Indebetouw R
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.
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DOI:
10.1086/307971
发表时间:
1999
期刊:
The Astrophysical Journal
影响因子:
--
作者:
S. Tayal;G. Gupta
通讯作者:
G. Gupta
影响因子:
4.9
作者:
HOLLENBACH, D;MCKEE, CF
通讯作者:
MCKEE, CF
DOI:
10.1117/12.550744
发表时间:
2004-07
期刊:
--
影响因子:
--
作者:
G. Fazio;J. Hora;L. E. Allen;M. Ashby;P. Barmby;L. Deutsch;J.-S. Huang;S. Kleiner;M. Marengo-M.
通讯作者:
G. Fazio;J. Hora;L. E. Allen;M. Ashby;P. Barmby;L. Deutsch;J.-S. Huang;S. Kleiner;M. Marengo-M.
影响因子:
8.7
作者:
J. Raymond
通讯作者:
J. Raymond
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
V. Lebouteiller;J. Bernard;B. Brandl;D. Whelan;Yanling Wu;V. Charmandaris;D. Devost;J. Houck
通讯作者:
J. Houck