Chemical and radiative transfer modelling of the ISO-LWS Fabry-Perot spectra of Orion-KL water lines
Chemical and radiative transfer modelling of the ISO-LWS Fabry-Perot spectra of Orion-KL water lines
复制标题
Orion-KL 水线 ISO-LWS 法布里-珀罗光谱的化学和辐射传输建模
DOI：
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
B. Swinyard
中科院分区：
文献类型：
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作者：
M. R. Lerate;J. Yates;M. Barlow;S. Viti;B. Swinyard
本文给出了红外空间天文台（ISO）上的长波光谱仪（LWS）在高分辨率法布里-珀罗（FP）模式下从猎户座KL区观测到的许多远红外正、仲H2O谱线的化学和辐射传输模型。首先通过模拟猎户座-KL不同已知组件的条件来研究该区域的化学：热核，高原和脊的化学模型与加速A迭代辐射传输模型相结合，以预测H2 O线通量和轮廓。我们的模型包括前45个能级的邻-和对位-H2O。我们发现，在70-90 K温度下，密度为3 × 105 cm-3的气体，以30 km s-1的速度膨胀，H2O/H2丰度比为2-3 × 10 - 5，与Cernicharo等人推导的丰度相似，最好地再现了由高于560 K的能级产生的H2 O谱线的通量和轮廓的模型具有显著更高的H2 O/H2丰度，1-5 × 10 - 4，其源自高原区域中的类似密度的气体，该气体已被加热到300 K，弛豫到90-100 K。我们的结论是，所观察到的水线不源于高温冲击。
We present chemical and radiative transfer models for the many far-infrared ortho- and paraH 2 O lines that were observed from the Orion-KL region in high resolution Fabry-Perot (FP) mode by the Long Wavelength Spectrometer (LWS) on board the Infrared Space Observatory (ISO). The chemistry of the region was first studied by simulating the conditions in the different known components of Orion-KL: chemical models for a hot core, a plateau and a ridge were coupled with an accelerated A-iteration radiative transfer model to predict H 2 O line fluxes and profiles. Our models include the first 45 energy levels of ortho- and para-H 2 O. We find that lines arising from energy levels below 560 K were best reproduced by a gas of density 3 x 10 5 cm -3 at a temperature of 70-90 K, expanding at a velocity of 30 km s -1 and with a H 2 O/H 2 abundance ratio of the order of 2-3 x 10 -5 , similar to the abundance derived by Cernicharo et al. However, the model that best reproduces the fluxes and profiles of H 2 O lines arising from energy levels above 560 K has a significantly higher H 2 O/H 2 abundance, 1-5 x 10 -4 , originating from gas of similar density, in the Plateau region, that has been heated to 300 K, relaxing to 90-100 K. We conclude that the observed water lines do not originate from high-temperature shocks.
Orion KL 的物理参数，来自对其 ISO 高分辨率远红外 CO 线谱建模
DOI：
10.1111/j.1365-2966.2008.13349.x
发表时间：
2008
影响因子：
4.8
作者：
Lerate M
通讯作者：
Lerate M