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首页> 外文期刊>The Astrophysical Journal. Supplement Series >A 95GHz class i methanol maser survey toward glimpse extended green objects (EGOs)
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A 95GHz class i methanol maser survey toward glimpse extended green objects (EGOs)

机译：进行一目了然的绿色物体（EGO）的95GHz I类甲醇maser调查

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摘要

We report the results of a systematic survey for 95GHz classI methanol masers toward a new sample of 192 massive young stellar object candidates associated with ongoing outflows (known as extended green objects or EGOs) identified from the Spitzer Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) survey. The observations were made with the Australia Telescope National Facility (ATNF) Mopra 22m radio telescope and resulted in the detection of 105 new 95GHz classI methanol masers. For 92 of the sources our observations provide the first identification of a classI maser transition associated with these objects (i.e., they are new classI methanol maser sources). Our survey proves that there is indeed a high detection rate (55%) of classI methanol masers toward EGOs. Comparison of the GLIMPSE point sources associated with EGOs with and without classI methanol maser detections shows that they have similar mid-IR colors, with the majority meeting the color selection criteria -0.6 < [5.8]-[8.0] < 1.4 and 0.5 < [3.6]-[4.5] < 4.0. Investigations of the Infrared Array Camera and Multiband Imaging Photometer for Spitzer 24 μm colors and the associated millimeter dust clump properties (mass and density) of the EGOs for the sub-samples based on the classof methanol masers they are associated with suggest that the stellar mass range associated with classI methanol masers extends to lower masses than for classII methanol masers, or alternatively classI methanol masers may be associated with more than one evolutionary phase during the formation of a high-mass star.
机译：我们报告了针对95GHz I类甲醇的系统调查结果，这些数据来自于从Spitzer Galactic Legacy红外中平面调查非凡（（ GLIMPSE）调查。观测是使用澳大利亚望远镜国家设施（ATNF）Mopra 22m射电望远镜进行的，结果发现了105台新的95GHz I类甲醇激射器。对于92个来源，我们的观察结果首次确定了与这些物体相关的I类maser转变（即它们是新的I类甲醇maser来源）。我们的调查证明，针对EGO的I类甲醇确有很高的检出率（55％）。比较有无I类甲醇maser检测的EGO的GLIMPSE点源，它们具有类似的中红外色，大多数满足选色标准-0.6 <[5.8]-[8.0] <1.4和0.5 <[ 3.6]-[4.5] <4.0。根据与之相关的甲醇激射器类别，对斯皮策24μm色的红外阵列照相机和多波段成像光度计进行了研究，并对子样品的EGO的相关毫米尘埃团块性质（质量和密度）进行了研究，这表明它们的恒星质量与I类甲醇masers相关的范围扩大到比II类甲醇masers更低的质量，或者，I类甲醇masers可能与高质量恒星形成期间的一个以上演化相相关。

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