论文标题
VLA Baade调查中的地面振动状态SIO排放
Ground Vibrational State SiO Emission in the VLA BAaDE Survey
论文作者
论文摘要
使用恒星Sio Masers的凸起不对称和动力学演化（BAADE）的子样本，我们探讨了$^{28} $ sio $ j = 1-0，v = 0 $排放的流行率和特征。我们确定了90个检测MASER，热或复合$^{28} $ SIO $ J = 1-0，V = 0 $从NSF的Karl G. Jansky大约13,000个候选光谱中排出，这是非常大的阵列（VLA）。我们发现，被检测到的来源可能是属于明亮，前景的银河系恒星磁盘种群的渐近巨型分支（AGB）。对于显示热成分的32个来源，我们通过拟合热线轮廓提取流出速度的值。我们发现了一系列的折叠式膨胀速度，并与先前记录的OH和CO扩展速度进行了比较。这项初步调查已经是迄今为止对恒星地面振动状态SIO MASERS的最大研究，当完成18,988个目标来源的数据减少时，将扩展到整个VLA Baade数据集。
Using a subsample of the Bulge Asymmetries and Dynamical Evolution (BAaDE) survey of stellar SiO masers, we explore the prevalence and characteristics of $^{28}$SiO $J=1-0, v=0$ emission. We identify 90 detections of maser, thermal, or composite $^{28}$SiO $J=1-0, v=0$ emission out of approximately 13,000 candidate spectra from the NSF's Karl G. Jansky Very Large Array (VLA). We find that the detected sources are likely asymptotic giant branch (AGB) stars belonging to a bright, foreground Milky Way stellar disk population. For the 32 sources showing thermal components, we extract values for outflow velocity by fitting thermal line profiles. We find a range of circumstellar envelope expansion velocities, and compare to previously recorded OH and CO expansion velocities. This preliminary survey is already the largest study of stellar ground-vibrational-state SiO masers to date, and will be expanded to include the entire VLA BAaDE dataset when data reduction for the 18,988 target sources is completed.
