A 95 GHz CLASS I METHANOL MASER SURVEY TOWARD A SAMPLE OF GLIMPSE POINT SOURCES ASSOCIATED WITH BGPS CLUMPS
A 95 GHz CLASS I METHANOL MASER SURVEY TOWARD A SAMPLE OF GLIMPSE POINT SOURCES ASSOCIATED WITH BGPS CLUMPS
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DOI：
10.1088/0067-0049/200/1/5
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发表时间：
2012-02
期刊：
影响因子：
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通讯作者：
Xi Chen;S. Ellingsen;Jinhua He;Ye Xu;C. Gan;Zhi-qiang Shen;T. An;Yan Sun;B. Ju
中科院分区：
文献类型：
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作者：
Xi Chen;S. Ellingsen;Jinhua He;Ye Xu;C. Gan;Zhi-qiang Shen;T. An;Yan Sun;B. Ju
我们报告了紫金山天文台13.7米射电望远镜对95 GHz （80-71 a +）跃迁的I类甲醇脉泽的调查。通过结合来自斯皮策GLIMPSE和1.1 mm Bolocam银河平面测量（BGPS）目录的信息，选择了214个目标源。观测到的源满足[3.6]-[4.5]> 1.3、[3.6]-[5.8]> 2.5、[3.6]-[8.0]> 2.5和8.0 μ mag < 10的GLIMPSE中红外标准；它们也有一个相关的1.1毫米BGPS源。在63个源中检测到I类甲醇微波激射，对应于本次调查的检测率为29%。对于大多数检测（43），这是第一次识别与这些来源相关的I类甲醇脉泽。我们发现，I类甲醇微波激射的强度与中红外强度或瞥见点源的颜色不密切相关；然而，它与BGPS源的特性（质量和束平均柱密度）密切相关。比较有和没有一级甲醇微波激射器的BGPS源的恒星形成活性，发现有一级甲醇微波激射器的源通常比没有一级甲醇微波激射器的源具有更高的柱密度和更大的通量密度。我们的结果预测，标准log (Sint)≥−38.0 + 1.72log (NbeamH2)，并且利用了BGPS源的积分通量密度（Sint）和束平均柱密度（），对于选择可能具有相关的I类甲醇微波发生器的源非常有效。我们的期望是，使用这些标准的搜索将从整个BGPS目录（~ 1000）中检测到90%的I类甲醇脉泽的预测数量，并且它们将以高检测效率（~ 75%）这样做。
We report a survey with the Purple Mountain Observatory 13.7 m radio telescope for class I methanol masers from the 95 GHz (80–71 A+) transition. Two hundred and fourteen target sources were selected by combining information from both the Spitzer GLIMPSE and 1.1 mm Bolocam Galactic Plane Survey (BGPS) catalogs. The observed sources satisfy the GLIMPSE mid-IR criteria of [3.6]–[4.5] > 1.3, [3.6]–[5.8] > 2.5, [3.6]–[8.0] > 2.5 and 8.0 μm mag less than 10; they also have an associated 1.1 mm BGPS source. Class I methanol maser emission was detected in 63 sources, corresponding to a detection rate of 29% for this survey. For the majority of detections (43), this is the first identification of class I methanol masers associated with these sources. We show that the intensity of the class I methanol maser emission is not closely related to mid-IR intensity or the colors of the GLIMPSE point sources; however, it is closely correlated with properties (mass and beam-averaged column density) of the BGPS sources. Comparison of measures of star formation activity for the BGPS sources with and without class I methanol masers indicates that the sources with class I methanol masers usually have higher column density and larger flux density than those without them. Our results predict that the criteria log (Sint) ⩽ −38.0 + 1.72log (NbeamH2) and , which utilizes both the integrated flux density (Sint) and beam-averaged column density () of the BGPS sources, are very efficient for selecting sources likely to have an associated class I methanol maser. Our expectation is that searches using these criteria will detect 90% of the predicted number of class I methanol masers from the full BGPS catalog (∼1000), and that they will do so with a high detection efficiency (∼75%).