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arXiv 1001.0650astro-ph.SR
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猎户座-KL中的盘和外流特征：高分辨率热红外光谱的能力

Disk and outflow signatures in Orion-KL: The power of high-resolution thermal infrared spectroscopy

H. Beuther, H. Linz, A. Bik., M. Goto, Th. Henning

备注：
12 pages, 15 pages, accepted for A&A, you find a high-resolution copy at http://www.mpia-hd.mpg.de/homes/beuther/papers.html
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摘要：

我们使用CRIRES光谱仪的VLT研究的振转12 CO/13 CO，Pfund β和H2的发射4.59和4.72 μ波长之间的BN对象，磁盘候选源n，和建议的尘埃密度增强IRC 3。我们检测到CO的吸收和排放功能对所有三个目标。对于BN天体，数据部分证实了25年前Scoville等人获得的结果，然而，我们也发现了几个新特征。虽然蓝移的吸收可能是由于流出的气体，朝向BN对象，我们检测到CO的发射直径延伸到~ 3300 AU。虽然在观测光谱分辨率的限制，13 CO线宽的功能增加能级，符合磁盘的起源。如果一个属性的扩展CO排放也盘的起源，其程度是一致的，与其他大规模的磁盘候选人在文献中。对于源n，我们还发现蓝移CO吸收可能来自流出。然而，它也表现出较窄的红移CO吸收和相邻的弱CO发射范围，符合下落运动。我们不对源n的发射进行空间分辨。我们对这两种源的13 CO吸收特征进行了玻尔兹曼分析，发现温度在100 ~ 160 K之间，H2柱密度约为10^23 cm ^-2的几倍。IRC 3的观测特征非常不同，只有弱吸收，而连续源要弱得多。然而，CO排放的延伸，并显示楔形的位置速度签名一致的射流夹带的分子气体，可能与猎户座KL外流系统。我们还介绍和讨论了该地区的Pfund β和H2排放。

英文摘要：

We used the CRIRES spectrograph on the VLT to study the ro-vibrational 12CO/13CO, the Pfund beta and H2 emission between 4.59 and 4.72mu wavelengths toward the BN object, the disk candidate source n, and a proposed dust density enhancement IRC3. We detected CO absorption and emission features toward all three targets. Toward the BN object, the data partly confirm the results obtained more than 25 years ago by Scoville et al., however, we also identify several new features. While the blue-shifted absorption is likely due to outflowing gas, toward the BN object we detect CO in emission extending in diameter to ~3300AU. Although at the observational spectral resolution limit, the 13CO line width of that feature increases with energy levels, consistent with a disk origin. If one attributes the extended CO emission also to a disk origin, its extent is consistent with other massive disk candidates in the literature. For source n, we also find the blue-shifted CO absorption likely from an outflow. However, it also exhibits a narrower range of redshifted CO absorption and adjacent weak CO emission, consistent with infalling motions. We do not spatially resolve the emission for source n. For both sources we conduct a Boltzmann analysis of the 13CO absorption features and find temperatures between 100 and 160K, and H2 column densities of the order a few times 10^23cm^-2. The observational signatures from IRC3 are very different with only weak absorption against a much weaker continuum source. However, the CO emission is extended and shows wedge-like position velocity signatures consistent with jet-entrainment of molecular gas, potentially associated with the Orion-KL outflow system. We also present and discuss the Pfund beta and H2 emission in the region.

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