标题： 从RNO91产生的受激分子氢 显示英文标题

标题： Shocked Molecular Hydrogen from RNO91

摘要： 我们报告在2.122微米处检测到来自L43暗云中的RNO91的H2 v=1-0 S(1)线，该天体已知是一个被1700AU盘结构（含有冰）包围的T Tauri星，并有弱喷流。 H2 v=2-1 S(1)线在2.247微米处的未检测到表明是冲击激发而非荧光。 该发射在南北方向上空间扩展可达9角秒。 线强度峰值（FWHM 3角秒）对应于嵌入气体和尘埃包层中的恒星RNO91。 从该包层观测到的H2发射可能归因于嵌入的Herbig-Haro类似结。 中心2"X3"范围内的H2线流量估计为7X10^{-14} ergs/sec/cm^{2}，这表明质量流量率为4X10^{-8} M_{太阳}/yr。 此外，通过H2 1-0 S(1)滤光片拍摄的窄带图像显示了一个倾斜的盘和双极喷流结构，这与早期的观测和模型一致。 我们表明这个盘/喷流系统是一个独特的情况。 显示英文摘要

摘要： We report the detection of the H2 v=1-0 S(1) line at 2.122um, from RNO91 in the L43 dark cloud, which is known to be a T Tauri star surrounded by a 1700AU disk structure (containing ices) and a weak outflow. The non-detection of the H2 v=2-1 S(1) line at 2.247um suggests shock excitation rather than fluorescence. The emission is extended spatially up to 9arcsec in the north-south direction. The line intensity peak (FWHM 3arcsec) corresponds to the star RNO91 which is embedded in a cocoon of gas and dust. The observed H2 emission from this cocoon may be attributed to embedded Herbig-Haro like knots. The H2 line flux in the central 2"X3"is estimated to be 7X10^{-14} ergs/sec/cm^{2}, which indicates a mass flow rate of 4X10^{-8} M_{sun}/yr. Furthermore, narrow band image taken through H2 1-0 S(1) filter is presented, which reveal a tilted disk and bipolar outflow structure that agrees with earlier observations and models. We show that this disk/outflow system is a unique case.