New Results on the Submillimeter Polarization Spectrum of the Orion Molecular Cloud
New Results on the Submillimeter Polarization Spectrum of the Orion Molecular Cloud
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猎户座分子云亚毫米偏振光谱的新结果
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Michael Attard
中科院分区：
文献类型：
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作者：
J. Vaillancourt;C. D. Dowell;R. Hildebrand;L. Kirby;M. Krejny;Hua;Giles Novak;M. Houde;H. Shinnaga;Michael Attard
我们用美国加州理工学院亚毫米波天文台的SHARP偏振仪，在猎户座分子云的~2' × 3'区域，绘制了350和450 μ m波长的偏振图。这张地图覆盖了OMC-1山脊最明亮的区域，包括Kleinmann-Low（KL）星云和猎户座南部的亚毫米源。450和350 μ m的偏振比在云的外部约为1.3 ± 0.3，并且朝向KL下降超过2倍。外层云的偏振比与其他云在类似波长下的测量结果一致，并证实了先前的测量结果，即尘埃分子云的偏振比最小值在λ = 350 μ m处。
We have used the SHARP polarimeter at the Caltech Submillimeter Observatory to map the polarization at wavelengths of 350 and 450 μ m in a ~2' × 3' region of the Orion Molecular Cloud. The map covers the brightest region of the OMC-1 ridge including the Kleinmann-Low (KL) nebula and the submillimeter source Orion-south. The ratio of 450 to 350 μ m polarization is ~1.3 ± 0.3 in the outer parts of the cloud and drops by more than a factor of 2 toward KL. The outer cloud ratio is consistent with measurements in other clouds at similar wavelengths and confirms previous measurements placing the minimum of the polarization ratio in dusty molecular clouds at λ ∼ 350 μ m .