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首页> 外文期刊>The Astrophysical Journal. Supplement Series >The Relationship between 6.7 GHz Methanol Masers and Radio Recombination Lines in High-mass Star-forming Regions
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The Relationship between 6.7 GHz Methanol Masers and Radio Recombination Lines in High-mass Star-forming Regions

机译：6.7GHz甲醇涂料与高质量恒星形成区的无线电复合线之间的关系

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摘要

We report a systematic survey of a 6.7 GHz Class II methanol maser toward a sample of 448 sources selected from the Red Midcourse Space Experiment Source catalog. These sample sources are composed of high-mass star-forming region (HMSFR) candidates and have been studied as tracers of HMSFRs, such as water masers or radio continuum emission of ultracompact H ii region. The survey was conducted using the Shanghai Tianma Radio Telescope. Through the observations, we simultaneously studied the 4.7 and 6.0 GHz excited-state interstellar hydroxyl (OH) maser lines and 10 hydrogen radio recombination lines (RRLs) in the C band. In total, we detected 6.7 GHz methanol masers and RRLs from 102 and 116 sources, respectively. In addition, 4, 3, and 10 sources exhibit OH masers at 4765.56, 6030.75, and 6035.09 MHz transitions, respectively. Through the survey, we identified four new 6.7 GHz methanol maser sources and three new excited-state OH maser sources (one at 4750 MHz and two at 6035 MHz). The statistical analysis demonstrated that there is a positive correlation of luminosity between 6.7 GHz methanol masers and RRLs. A good correlation of integrated luminosity between radio continuum emission and the 6.7 GHz methanol masers is presented with respect to the RRL emission sources. The average of the integrated luminosities of the RRLs in the sources with 6.7 GHz masers is greater than those without the 6.7 GHz masers; similarly, the average of integrated luminosities of the 6.7 GHz methanol masers in the sources with RRLs is greater than those without the RRLs. Moreover, we found that the averages of the emission measure and electron temperature of H ii regions associated with 6.7 GHz methanol masers are larger than those without the 6.7 GHz methanol masers. This suggests that the masers are most likely produced in high gas density and luminous regions with brighter RRLs and higher radio continuum emission.
机译：我们报告了对6.7GHz类II甲醇爆发的系统调查，朝向选自红色中间电机空间实验源目录的448个源的样品。这些样品源由高质量星形形成区（HMSFR）候选物组成，并且已经被研究为HMSFR的示踪剂，例如水粉碎剂或超自联H II区域的射线连续排放。该调查是使用上海天马射频望远镜进行的。通过观察结果，我们同时研究了C 4.7和6.0GHz激发态星形羟基（OH）MASER线和C CAND中的10氢无线电重组线（RRL）。总共检测到6.7 GHz甲醇涂料和来自102和116个来源的RRL。另外，4,3和10个来源分别在4765.56,6030.75和6035.09MHz过渡处表现出OH涂片器。通过该调查，我们确定了四种新的6.7 GHz甲醇狂欢源和三个新的兴奋状态哦蒙皮源（一个在4750 MHz，两个在6035 MHz）。统计分析表明，6.7GHz甲醇涂料和RRL之间的亮度存在正相关。关于RRL排放源提出了无线电连续发射和6.7GHz甲醇粉碎剂之间的综合亮度的良好相关性。具有6.7 GHz Masers中RRL中RRL的集成光亮的平均值大于没有6.7 GHz涂片机的人;类似地，具有RRL的6.7GHz甲醇蛋白质粉末的综合发光的平均值大于没有RRL的源。此外，我们发现，与6.7GHz甲醇粉碎剂相关的HI II区域的排放量和电子温度的平均值大于没有6.7GHz甲醇涂料的含量。这表明用粉碎机最有可能在具有更亮的RRL和更高的无线电连续发射的高气体密度和发光区域中产生。

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