论文标题
44 GHz甲醇masers：朝向95 GHz甲醇masers的观测值
44 GHz methanol masers: Observations toward 95 GHz methanol masers
论文作者
论文摘要
我们报告了来自95 GHz I类甲醇Maser目录的144个来源的同时进行的44和95 GHz I类甲醇Maser调查。观察结果是用韩国长的三个望远镜以单次态模式运行的非常长的基线干涉仪网络。在44 GHz时的检测率为89％，在95 GHz时为77％。 44 GHz有106个新发现。将前95 GHz的检测与使用紫色山脉天文台13.7 m射电望远镜进行的相同过渡的新观察结果进行了比较，没有明显的证据证明六年的时间表。 44和95 GHz转变的发射显示出峰值速度，峰值密度和整合通量密度的强相关性，表明它们可能是相互助力的。我们发现，随着44 GHz峰值通量密度的增加，峰值通量密度比SPK，95/SPK，44个减小。我们发现，样品中的某些I类I甲醇masers可能与红外云有关，而另一些则与H II区域有关，表明某些来源发生在高质量星形成的早期阶段，而另一些则位于更具进化的来源。
We report a simultaneous 44 and 95 GHz class I methanol maser survey toward 144 sources from the 95 GHz class I methanol maser catalog. The observations were made with the three telescopes of the Korean very long baseline interferometry network operating in single-dish mode. The detection rates are 89% at 44 GHz and 77% at 95 GHz. There are 106 new discoveries at 44 GHz. Comparing the previous 95 GHz detections with new observations of the same transitions made using the Purple Mountain Observatory 13.7 m radio telescope shows no clear evidence of variability on a timescale of six years. Emission from the 44 and 95 GHz transitions shows strong correlations in peak velocity, peak flux density, and integrated flux density, indicating that they are likely cospatial. We found that the peak flux density ratio Spk,95/Spk,44 decreases as the 44 GHz peak flux density increases. We found that some class I methanol masers in our sample could be associated with infrared dark clouds, while others are associated with H II regions, indicating that some sources occur at an early stage of high-mass star formation, while others are located toward more evolved sources.
