KINEMATICS OF THE ENVELOPE AND TWO BIPOLAR JETS IN THE CLASS 0 PROTOSTELLAR SYSTEM L1157
KINEMATICS OF THE ENVELOPE AND TWO BIPOLAR JETS IN THE CLASS 0 PROTOSTELLAR SYSTEM L1157
复制标题
0 类原恒星系统 L1157 中的包层和两个双极喷流的运动学
DOI：
10.1088/0004-637x/814/1/43
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
L. Looney
中科院分区：
文献类型：
--
作者：
W. Kwon;M. Fernández;I. Stephens;L. Looney
巨大的包层和强烈的双极流出是最年轻的原恒星系统的两个主要结构特征。为了了解双极出口的物理性质及其与包膜的关系，我们利用毫米波天文研究联合阵列获得了CO J = 2-1中最年轻的原恒星系统L1157的整个双极出口的马赛克图，其角分辨率约为5″。通过对整个双极流出的这些观测，我们估计了它的物理性质，并表明它们与多个射流一致。我们还约束了一个首选岁差方向。此外，在λ = 1.3 ？各种分子线：C17O、C18O、13CO、CS、CN、N2H+、CH3OH、H2O、SO、SO2。所有的CO同位素和CS、CN和N2H+都被检测和成像。我们边际检测到的特征可以解释为C17O和C18O的旋转内包络和N2H+的下降外包络。我们还估计了包层和中心原恒星质量，并发现尘埃不透明度光谱指数随半径变化。
A massive envelope and a strong bipolar outflow are the two main structures characterizing the youngest protostellar systems. In order to understand the physical properties of a bipolar outflow and the relationship with those of the envelope, we obtained a mosaic map covering the whole bipolar outflow of the youngest protostellar system L1157 with about 5″ angular resolution in CO J = 2–1 using the Combined Array for Research in Millimeter-wave Astronomy. By utilizing these observations of the whole bipolar outflow, we estimate its physical properties and show that they are consistent with multiple jets. We also constrain a preferred precession direction. In addition, we observed the central envelope structure with 2″ resolution in the λ = 1.3 ?> and 3 mm continua and various molecular lines: C17O, C18O, 13CO, CS, CN, N2H+, CH3OH, H2O, SO, and SO2. All of the CO isotopes and CS, CN, and N2H+ have been detected and imaged. We marginally detected the features that can be interpreted as a rotating inner envelope in C17O and C18O and as an infalling outer envelope in N2H+. We also estimated the envelope and central protostellar masses and found that the dust-opacity spectral index changes with radius.