低分辨Spitzer光谱法测量有机分子的发光
Measuring Organic Molecular Emission in Disks with Low Resolution Spitzer Spectroscopy
摘要：
我们探讨在何种程度上斯皮策IRS光谱在低光谱分辨率可以用于定量研究的有机分子发射磁盘周围的低质量的年轻恒星。我们使用斯皮策IRS光谱采取的高分辨率和低分辨率模块相同的来源，以调查是否有可能定义线指数，可以衡量的趋势，在低分辨率数据的分子特征的强度。我们发现，在高分辨率数据中看到的HCN发射强度的趋势可以在低分辨率数据中恢复。在研究影响HCN辐射强度的因素时，我们发现低分辨率的HCN通量与恒星吸积速率和X射线光度有适度的相关性。根据最近对盘内大气的观测和理论研究，这种相关性也许是可以预期的。我们的研究结果表明，使用大量的低分辨率磁盘光谱，驻留在斯皮策档案研究的因素，影响分子发射强度磁盘的潜力。这些研究将补充IRS在高分辨率下观测到的数量少得多的星周盘的结果。
英文摘要：
We explore the extent to which Spitzer IRS spectra taken at low spectral resolution can be used in quantitative studies of organic molecular emission from disks surrounding low mass young stars. We use Spitzer IRS spectra taken in both the high and low resolution modules for the same sources to investigate whether it is possible to define line indices that can measure trends in the strength of the molecular features in low resolution data. We find that trends in HCN emission strength seen in the high resolution data can be recovered in low resolution data. In examining the factors that influence the HCN emission strength, we find that the low resolution HCN flux is modestly correlated with stellar accretion rate and X-ray luminosity. Correlations of this kind are perhaps expected based on recent observational and theoretical studies of inner disk atmospheres. Our results demonstrate the potential of using the large number of low resolution disk spectra that reside in the Spitzer archive to study the factors that influence the strength of molecular emission from disks. Such studies would complement results for the much smaller number of circumstellar disks that have been observed at high resolution with IRS.
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