摘要
利用紫金山天文台青海观测站13 .7 米射电望远镜对红外源IRAS054370001 和IRAS05351 + 3549 附近区域进行了CO(J= 1 - 0) 的分子谱线观测.发现在这两个源的方向都有很强的CO 发射,CO 谱线还有明显的线翼成分,这暗示两个红外源存在分子外流.同时还获得了每个源5′×5′的成图.通过对高速气体的空间分布的观测和分析,认为这两个源为分子外流源.其中IRAS054370001 附近区域的外流结构比较复杂,可能这一区域的外流是多极的.IRAS05351 + 3549 附近的外流结构较简单.从两个源的红外光谱分类以及外流的动力学时标得出都是年轻星( 年龄～105 yrs) .通过对这两个外流源的参数估算,得出两个外流源的质量损失率.
The authors observed CO(1-0) spectral lines towards IRAS 05437-0001 and IRAS 05351+3549 as well as their adjacent areas with the 13.7 m radio telescope in Delingha, Qinghai. Both sources show intense CO emissions. The CO lines exhibit conspicuous wings, suggesting molecular outflows. A 5′×5′ map for each area has been constructed. The authors conclude that these sources are those of molecular outflow. The outflowing gas surrounding IRAS 05437-0001 possesses complicated structures, suggesting a multi polar outflow. The cloud embedding IRAS 05351+3549, however, exhibits simple outflow structure. It is interesting to note that the structure of the outflow gas is asymmetric with respect to IRAS 05351+3549. Therefore, further studies on these sources should be promising. From the observed lines, some physical parameters of the sources have been derived. Then the mass loss rates of these sources have also been got. It is concluded from the dynamic time scale and IR spectral type of each source that both are young stellar objects (with ages of a few 10 5 years).
出处
《天文学报》
CSCD
北大核心
2000年第1期28-35,共8页
Acta Astronomica Sinica
基金
国家自然科学基金!19625307 项目
关键词
恒星形成
星际介质
喷流
分子外流
CO分子普线
star formation, interstellar medium, jet and molecular outflow, radio spectral line, individual sources (IRAS 05437-0001, IRAS 05351+3549)
