恒星形成区的云核和星团
发布时间：2018-07-16 07:48
【摘要】：利用青海站13.7 m毫米波望远镜对17个与星团成协的恒星形成区进行了~(12)CO(J=1-0)、~(13)CO(J=1-0)和C~(18)O(J=1-0)的同时成图观测.除了IRAS04547+4753,这些源均探测到较强的C~(18)O(J=1-0)的谱线发射.由于分子云的大小不同,有13个源观测到~(13)CO(J=1-0)谱线积分强度极大值的一半处,其他源因分子云延展范围较大,没有进行大面积的成图观测.基于观测数据,计算了各云核的谱线线宽、亮温度、尺度、密度和质量等,~(13)CO和C~(13)O云核的维里质量与局部热动平衡(LTE)质量之比分别为0.66和0.74,它们接近于维里平衡状态.为了从形态方面比较云核与星团,将谱线的积分强度图与2MASS的K波段图像叠加.同时,计算了与云核成协的星团的大小和质量,数据采用了2MASS的近红外点源测光结果.基于云核与星团的质量结果,计算了分子云的恒星形成效率,大致在10%～30%的范围.
[Abstract]:Using the 13.7 m millimeter wave telescope of Qinghai station, the simultaneous mapping of ~ (12) CO (J _ (1-0) ~ (13) CO (J _ (1) O) and C ~ (18) O (J _ (1 ~ 0) has been carried out in 17 star forming regions associated with star clusters. With the exception of IRAS04547 4753, these sources have detected strong emission lines of C18O (JO1-0). Due to the difference of molecular cloud size, 13 sources have observed half of the maximum intensity of 13CO (JN1-0) spectral line, and the other sources have not made a large area mapping observation because of the extended range of molecular cloud. Based on the observed data, the ratios of the virial mass of 13CO and C13O cloud nuclei to the local thermodynamic equilibrium (LTE) mass are calculated to be 0.66 and 0.74 respectively, which are close to the state of the virial equilibrium, and the spectral line width, bright temperature, scale, density and mass of the cloud nuclei are calculated as 0.66 and 0.74 respectively. In order to compare cloud nuclei with star clusters in morphology, the integral intensity map of the spectral line is superposed with the K-band image of 2MASS. At the same time, the size and mass of star clusters associated with cloud nuclei are calculated. The data are measured by using 2MASS near infrared point source photometry. Based on the mass results of cloud nuclei and clusters, the star formation efficiency of molecular clouds is calculated in the range of 10 ~ 30%.
【作者单位】： 中国科学院紫金山天文台;中国科学院研究生院;
【基金】：国家自然科学基金项目(10873037)资助
【分类号】：P152
，
本文编号：2125727
[Abstract]:Using the 13.7 m millimeter wave telescope of Qinghai station, the simultaneous mapping of ~ (12) CO (J _ (1-0) ~ (13) CO (J _ (1) O) and C ~ (18) O (J _ (1 ~ 0) has been carried out in 17 star forming regions associated with star clusters. With the exception of IRAS04547 4753, these sources have detected strong emission lines of C18O (JO1-0). Due to the difference of molecular cloud size, 13 sources have observed half of the maximum intensity of 13CO (JN1-0) spectral line, and the other sources have not made a large area mapping observation because of the extended range of molecular cloud. Based on the observed data, the ratios of the virial mass of 13CO and C13O cloud nuclei to the local thermodynamic equilibrium (LTE) mass are calculated to be 0.66 and 0.74 respectively, which are close to the state of the virial equilibrium, and the spectral line width, bright temperature, scale, density and mass of the cloud nuclei are calculated as 0.66 and 0.74 respectively. In order to compare cloud nuclei with star clusters in morphology, the integral intensity map of the spectral line is superposed with the K-band image of 2MASS. At the same time, the size and mass of star clusters associated with cloud nuclei are calculated. The data are measured by using 2MASS near infrared point source photometry. Based on the mass results of cloud nuclei and clusters, the star formation efficiency of molecular clouds is calculated in the range of 10 ~ 30%.
【作者单位】： 中国科学院紫金山天文台;中国科学院研究生院;
【基金】：国家自然科学基金项目(10873037)资助
【分类号】：P152
，
本文编号：2125727
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