Boreiko R T, Betz A L, Zmuidzinas J
Space Sciences Laboratory, University of California, Berkeley, USA.
Astrophys J. 1989 Feb 1;337(1):332-41. doi: 10.1086/167106.
We have obtained high-resolution spectra of the 153 micrometers J = 17-16 CO line in the BN-KL region of Orion using a laser heterodyne spectrometer. The line shows broad wings (30 km s-1 FWHM at BN) characteristic of the plateau emission as well as a narrower component probably associated with the quiescent gas in the molecular ridge. From an analysis of the plateau emission together with that observed in lower J CO transitions, we derive an excitation temperature of 180 +/- 50 K and minimum column density of 1 x 10(18) cm-2 for CO in this component, which constitutes 80% of the total integrated intensity of the J = 17-16 line near BN. The peak intensity of the narrower component observed at 0.8 km s-1 resolution increases relative to that of the plateau component toward theta 1C and away from BN, while the width decreases from 10 to 4 km s-1 (FWHM).
我们使用激光外差光谱仪获得了猎户座BN-KL区域中153微米J = 17-16 CO线的高分辨率光谱。该谱线显示出宽翼（在BN处半高宽为30 km s-1），这是高原发射的特征，以及一个较窄的成分，可能与分子脊中的静态气体有关。通过对高原发射以及在较低J值CO跃迁中观测到的发射进行分析，我们得出该成分中CO的激发温度为180 +/- 50 K，最小柱密度为1 x 10(18) cm-2，该成分占BN附近J = 17-16线总积分强度的80%。在0.8 km s-1分辨率下观测到的较窄成分的峰值强度相对于高原成分，朝着θ1C方向且远离BN增加，而宽度从10 km s-1减小到4 km s-1（半高宽）。
