Observations of M17 and NGC 2024 at 21 cm
Observations of M17 and NGC 2024 at 21 cm
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M17 和 NGC 2024 在 21 厘米处的观测
DOI：
10.1093/mnras/183.2.119
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
W. Goss
中科院分区：
文献类型：
--
作者：
W. Löbert;W. Goss
HII区M17和NGC2024(也称为W12)已使用弗勒斯合成望远镜在21厘米处绘制，分辨率为∼50角秒。M17的北源被分解成三个分量，在东北边缘与H、α和[NiI]线所观察到的星云结构有很好的对应关系。这一区域尖锐的光学和射电边界暗示着电离锋面。源NGC 2024被显示为双精度。两组分的均方根电子密度为∼2×103 cm−3，电离氢质量为∼0.2M⊙。
The HIIregions M17 and NGC 2024 (also referred to as W12) have been mapped at 21 cm with a resolution of ∼ 50 arcsec using the Fleurs synthesis telescope. The northern source in M17 is resolved into three components and at the northeastern edge shows good correspondence with the structure of the nebula as observed in the lines of Hαand [NII]. The sharp optical and radio boundaries in this region are suggestive of an ionization front. The source NGC 2024 is shown to be a double. The two individual components have rms electron densities of ∼ 2 × 103cm−3and masses of ionized hydrogen of ∼ 0.2M⊙.