Boreiko R T, Betz A L
Space Sciences Laboratory, University of California, USA.
Astrophys J. 1989 Nov 15;346(2):L97-100. doi: 10.1086/185588.
We have observed the J = 22-21 line of 12CO at 2528 GHz (118.8 micrometers) in the IRc2 region of Orion. The spectra at 0.6 km s-1 resolution show both plateau emission with FWHM approximately 35 km s-1 and a narrower component with FWHM approximately 8 km s-1. Comparison with heterodyne data of similar quality on the J = 17-16 line indicates that the broad and narrow components both originate in gas with an excitation temperature Tex approximately 600 K. The emission is consistent with the predictions of shock models in which the wide component arises from the heated outflow gas and postshock molecular material, while the narrow component comes from ambient material near the leading edge of the shock front where temperatures are high but significant acceleration has not yet occurred.
我们在猎户座的IRc2区域观测到了处于2528吉赫兹（118.8微米）的12CO的J = 22 - 21谱线。分辨率为0.6千米每秒的光谱显示出半高宽约为35千米每秒的平台状发射以及半高宽约为8千米每秒的较窄成分。与J = 17 - 16谱线的类似质量的外差数据比较表明，宽成分和窄成分均源自激发温度Tex约为600 K的气体。这种发射与激波模型的预测相符，在该模型中，宽成分源于加热后的外流气体和激波后的分子物质，而窄成分则来自激波前沿前缘附近的环境物质，那里温度较高但尚未发生显著加速。
