The IRS 1 Circumstellar Disk, and the Origin of the Jet and CO Outflow in B5
The IRS 1 Circumstellar Disk, and the Origin of the Jet and CO Outflow in B5
复制标题
IRS 1 星周盘以及 B5 中喷流和 CO 流出的起源
作者：
W. Langer;T. Velusamy;T. Xie
我们报告发现的高速CO流出的内边缘的双极射流起源于IRS 1在巴纳德5和有史以来第一次解决其拱盘在2.6毫米的尘埃连续体和C18 O。从欧文斯谷毫米阵列的高空间分辨率观测中，我们能够将外流的起源定位在IRS 1两侧约500 Au的范围内，显然是在其周星盘的边缘或可能在其内。连续介质盘的取向垂直于最近在远得多的距离处的光发射中看到的高度准直的射流流出。在C18 O中检测到的圆盘质量约为0.16 M。我们的HCO+和HCN的地图表明显着的化学分化，在拱星区域的小尺度与HCO+跟踪扩展盘的材料。流出的12 CO干涉仪图显示了两个起源于IRS 1的锥形特征，蓝色的向东北方向展开，红色的向西南方向展开。圆锥体的顶点位于星周盘的两侧，并有大约90°的投影张开角。内禀张开角在60° ~ 90 °范围内，导致出流与入流之间存在明显的相互作用。
We report the discovery of the inner edge of the high velocity CO outflow associated with the bipolar jet originating from IRS 1 in Barnard 5 and the first ever resolution of its circumstellar disk in the 2.6 mm dust continuum and C18O. From high spatial resolution observations made with the Owens Valley Millimeter Array we are able to locate the origin of the outflow to within ~500 AU on either side of IRS 1 and apparently at the edge of, or possibly within, its circumstellar disk. The orientation of the continuum disk is perpendicular to the highly collimated jet outflow recently seen in optical emission at much farther distances. The disk has been detected in C18O giving a disk mass ~0.16 M☉. Our HCO+ and HCN maps indicate significant chemical differentiation in the circumstellar region on small scales with HCO+ tracing an extended disk of material. The 12CO interferometer maps of the outflow show two conelike features originating at IRS 1, the blue one fanning open to the northeast and the red one to the southwest. The vertices of the cones are on either side of the circumstellar disk and have a projected opening angle of about 90°. The intrinsic opening angle is in the range of 60°-90° which leads to significant interaction between outflow and infall.