Statistical properties of 6.7 GHz methanol maser sources
Statistical properties of 6.7 GHz methanol maser sources
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DOI：
10.1088/1009-9271/3/1/49
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发表时间：
2003-02
期刊：
影响因子：
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通讯作者：
Ye Xu;Xing-wu Zheng;D. Jiang
中科院分区：
文献类型：
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作者：
Ye Xu;Xing-wu Zheng;D. Jiang
本文统计分析了现有文献中482个6.7GHz甲醇脉泽源的脉泽发射及其相关红外源的特性。在色图上，超过70%的物体落在一个非常小的区域内（0.57 ≤ [25-12] ≤ 1.30和1.30 ≤ [60-12] ≤ 2.50）。这表明，6.7 GHz的甲醇脉泽发射只发生在一个非常短的演化阶段期间的最早阶段的星星形成。脉泽的速度范围主要分为两类：一类是1 ~ 10 km s-1，另一类是11 ~ 20 km s-1。这些速度范围表明，脉泽可能与磁盘和流出。脉泽和红外通量密度之间的相关性，以及脉泽和红外光度之间的相关性，表明远红外辐射是脉泽的一种可能的泵浦机制，这些脉泽很可能起源于一些外部分子包层或圆盘。
We present a statistical analysis of 482 6.7 GHz methanol maser sources from the available literature, on their maser emission and the characteristics of their associated infrared sources. On the color-color diagram, more than 70% of the objects fall within a very small region (0.57 ≤ [25-12] ≤ 1.30 and 1.30 ≤ [60-12] ≤ 2.50). This suggests that 6.7 GHz methanol maser emission occurs only within a very short evolutionary phase during the earliest stage of star formation. The velocity ranges of the masers belong to two main groups: one from 1 to 10 km s−1, and one from about 11 to 20 km s−1. These velocity ranges indicate that the masers are probably associated with both disks and outflows. The correlations between the maser and infrared flux densities, and between the maser and infrared luminosities, suggest that far-infrared radiation is a possible pumping mechanism for the masers which most probably originate from some outer molecular envelopes or disks.