首页> 外文期刊>The Astrophysical journal >EXTENDED [C Ⅰ] AND ~(13)CO (5 → 4) EMISSION IN M17SW
【24h】

EXTENDED [C Ⅰ] AND ~(13)CO (5 → 4) EMISSION IN M17SW

机译:M17SW中扩展的[CⅠ]和〜(13)CO(5→4)排放

获取原文
获取原文并翻译 | 示例
           

摘要

We mapped a 13 x 22 pc region in emission from 492 GHz [C Ⅰ] and, for the first time, 551 GHz ~(13)CO (5 → 4) in the giant molecular cloud M17SW. The morphologies of the [C Ⅰ] and ~(13)CO emission are strikingly similar. The extent and intensity of the [C Ⅰ] and ~(13)CO (5 → 4) emission is explained as arising from photo-dissociation regions on the surfaces of embedded molecular clumps. Modeling of the ~(13)CO (5 → 4) emission in comparison to ~(13)CO (1 → 0) indicates a temperature gradient across the cloud, peaking to at least 63 K near the M17 ionization front and decreasing to at least 20 K at the western edge of the cloud. We see no correlation between gas density and column density. The beam-averaged column density of C Ⅰ in the core is 1 x 10~(18) cm~(-2), and the mean column density ratio N(C Ⅰ)/N(CO) is about 0.4. The variations of N(C Ⅰ)/N(CO) with position in M17SW indicate a similar clump size distribution throughout the cloud.
机译:我们在492 GHz [CⅠ]的发射中绘制了一个13 x 22 pc的区域,并首次在巨型分子云M17SW中绘制了551 GHz〜(13)CO(5→4)。 [CⅠ]和〜(13)CO的排放形态极为相似。 [CⅠ]和〜(13)CO(5→4)发射的程度和强度被解释为是由嵌入的分子团簇表面上的光解离区引起的。与〜(13)CO(1→0)相比,〜(13)CO(5→4)发射的模型表明整个云层的温度梯度,在M17电离前沿附近达到至少63 K的峰值,并降至在云的西边缘至少20K。我们发现气体密度和色谱柱密度之间没有相关性。芯中CⅠ的束平均柱密度为1 x 10〜(18)cm〜(-2),平均柱密度比N(CⅠ)/ N(CO)约为0.4。 M17SW中N(CⅠ)/ N(CO)随位置的变化表明整个云团的团块大小分布相似。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号