【摘 要】
：
We have carried out CO J = 2 1 and CO J = 3 2 observations toward Tycho's supernova remnant (SNR) using the KOSMA 3m-telescope. From these observations, we iden
【机 构】
：
National Astronomical Observatories,NAOC-TU Joint Center for Astrophysics,Graduate University of the
论文部分内容阅读
We have carried out CO J = 2 1 and CO J = 3 2 observations toward Tycho's supernova remnant (SNR) using the KOSMA 3m-telescope. From these observations, we identified three molecular clouds (MCs) around the SNR. The small cloud in the southwest was discovered for the first time. In the north and east, two MCs (Cloud A and Cloud B) adjacent in space display a bow-shaped morphology, and have broad emission lines, which provide some direct evidences of the SNR-MCs interaction. The MCs are revealed at-69,,～-59 km s M . Positionvelocity diagrams show the two clouds to be adjacent in velocity, which means cloudcloud collision could occur in this region. The maximum value (0.66±0.10) of the integrated CO line intensity ratio (I=3-2/I=2-1) for the three MCs agrees well with the previous measurement of individual Galactic MCs, implying that the SNR shock drove into the MCs. The two MCs have a line intensity ratio gradient. The distribution of the ratio appears to indicate that the shock propagates from the southwest to the northeast.
其他文献
随着城市经济社会的不断发展，城市道路面临着大量的交叉口改造与新建。平面交叉口渠化作为一种从空间上分离交通流的手段，以解决交叉口对交通运输的瓶颈制约，是一种工期时间短、
The landscape pattern of Beijing wetlands has undergone a significant change as a result of natural and artificial elements.Supported by remote sensing and GIS
A staggered-grid finite difference method is used to model seismic wave records in a coal bearing,porous medium.The variables analyzed include the order of the
EVA(经济增加值),是由美国著名的思腾思特咨询公司提出的一种新的企业绩效评价方法。本文首先对EVA的内涵,计算进行介绍,并与传统的绩效评价体系进行了比较,并进一步对提升经
随着我国国民经济的高速发展,钢筋混凝土结构已经普遍用于工业和民用建筑中。但多年来,钢筋混凝土结构的裂缝一直是施工中最为常见和难以克服的弊病,尤其是楼板的裂缝,轻者影
A genetic algorithm was used to optimize the parameters of the two-dimensional Storm Surge/Tide Operational Model (STORM) to improve sea level predictions.The g
建筑工程是一项多工种、多任务、多工序交叉的系统工程.在建筑工程施工的管理上要从施工目标、施工对象、施工内容上进行综合管理,以达到预期的施工效果和目标.本文主要对现
新农村建设是一个综合的系统工程,也是一个完整的社会发展规划.本文介绍了新农村规划设计中的目的、存在的问题以及设计原则.并对居住建筑设计规划进行了重点的分析.
Understanding the responses of soil organic carbon (SOC) fractions to altitudinal gradient variation is important for understanding changes in the carbon balanc
Global ocean temperature has been rising since the late 1970s at a speed unprecedented during the past century of recordkeeping.This accelerated warming has pro