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arXiv 1206.0055astro-ph.SR
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验证甲醇脉泽环跟踪星周彗星的假设:高分辨率近红外和中红外成像

Testing the Hypothesis that Methanol Maser Rings Trace Circumstellar Disks: High Resolution Near-IR and Mid-IR Imaging

James M. De Buizer, Anna Bartkiewicz, Marian Szymczak

摘要:

毫弧秒VLBI地图的区域包含6.7 GHz的甲醇脉泽发射导致最近发现的环形分布的脉泽斑点和似是而非的假设,他们可能会跟踪拱星盘周围形成高质量的恒星。我们的目的是通过在近红外和中红外以高空间分辨率成像这些区域来测试这一假设,并将观察到的发射与从脉泽环的几何形状推断的预期红外形态进行比较。在近红外区域,我们使用了Altair/NIRI的Gemini North自适应光学系统,而在中红外区域,我们使用了Gemini South仪器T-ReCS和超分辨率技术的组合。所得到的图像在近红外和中红外都具有约150 mas的分辨率。我们讨论了预期的年轻和大规模的吸积(原)恒星周围的星周物质的分布和什么样的红外发射几何形状将预期不同的脉泽环方向的假设下,脉泽是来自星周盘。基于所观察到的红外发射几何形状的四个目标,在我们的样本和SED建模的结果与微波激射环的大规模年轻恒星物体,我们没有找到令人信服的证据支持的假设,甲醇脉泽环居住在拱星盘。

英文摘要:

Milliarcsecond VLBI maps of regions containing 6.7 GHz methanol maser emission have lead to the recent discovery of ring-like distributions of maser spots and the plausible hypothesis that they may be tracing circumstellar disks around forming high mass stars. We aimed to test this hypothesis by imaging these regions in the near and mid-infrared at high spatial resolution and compare the observed emission to the expected infrared morphologies as inferred from the geometries of the maser rings. In the near infrared we used the Gemini North adaptive optics system of Altair/NIRI, while in the mid-infrared we used the combination of the Gemini South instrument T-ReCS and super-resolution techniques. Resultant images had a resolution of approximately 150 mas in both the near-infrared and mid-infrared. We discuss the expected distribution of circumstellar material around young and massive accreting (proto)stars and what infrared emission geometries would be expected for the different maser ring orientations under the assumption that the masers are coming from within circumstellar disks. Based upon the observed infrared emission geometries for the four targets in our sample and the results of SED modeling of the massive young stellar objects associated with the maser rings, we do not find compelling evidence in support of the hypothesis that methanol masers rings reside in circumstellar disks.

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