We report the results of our pilot millimeter observations of periodic maser sources. Using SMA, we carried out 1.3-mm observations of G22.357+0.066 and G25.411+0.105, while ALMA 1.3-mm archival data were used in the case of G9.62+0.19E. Two continuum cores (MM1 and MM2) were detected in G22.357+0.066, while three cores (MM1 – MM3) detected in G25.411 + 0.105. Assuming dust-to-gas ratio of 100, we derived the masses of the detected cores. Using the 12CO (2–1) and 13CO (2–1) line emission, we observed gas kinematics tracing the presence of bipolar outflows in all three star-forming regions. In the cases of G22.357+0.066 and G9.62+0.19E, both with similar periodic maser light-curve profiles, the outflowing gas is seen in the north-west south-east direction. This suggest edge-on view of the two sources. G25.411+0.105, with a contrasting light-curve profile, show a spatially collocated blue and red outflow lobes, suggesting a face-on view. Our results suggest that orientation effects may play a role in determining the characteristics of the light curves of periodic methanol masers.

中文翻译：

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周期性甲醇微波激射源光曲线形状的定向效应

我们报告了我们对周期性脉泽源的试点毫米观测的结果。使用 SMA，我们对 G22.357+0.066 和 G25.411+0.105 进行了 1.3-mm 观测，而在 G9.62+0.19E 的情况下使用了 ALMA 1.3-mm 档案数据。在 G22.357+0.066 中检测到两个连续体核心（MM1 和 MM2），而在 G25.411 + 0.105 中检测到三个核心（MM1 – MM3）。假设尘气比为 100，我们推导出检测到的核心的质量。使用 12CO (2-1) 和 13CO (2-1) 线发射，我们观察到气体运动学追踪所有三个恒星形成区域中双极流出的存在。G22.357+0.066和G9.62+0.19E具有相似的周期性脉泽光曲线剖面，出气方向为西北-东南方向。这表明这两个来源的边缘观点。G25.411+0.105, 具有对比鲜明的光曲线轮廓，显示空间上并置的蓝色和红色流出叶，暗示正面视图。我们的结果表明，取向效应可能在确定周期性甲醇微波激射器的光变曲线特征中发挥作用。