Photoionization Models of NGC 346
Photoionization Models of NGC 346
复制标题
NGC 346 的光电离模型
DOI：
--
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
John E. Beckman
中科院分区：
文献类型：
--
作者：
M. Relaño;M. Peimbert;John E. Beckman
我们提出了 NGC 346（小麦哲伦星云中的 H II 区域）的球对称和平面平行光电离模型。这些模型基于 CLOUDY 以及 Peimbert、Peimbert 和 Ruiz 的观察。我们发现大约45%的H电离光子从H II区域逸出，为SMC的低密度星际介质提供了重要的电离源。预测的 I(4363)/I(5007) 值小于观测值，这可能意味着模型未考虑到额外的能量来源。根据最佳模型的电离结构和观察到的线强度，我们确定了 N、Ne、S、Ar 和 Fe 相对于 O 的丰度。
We present spherically symmetric and plane-parallel photoionization models of NGC 346, an H II region in the Small Magellanic Cloud. The models are based on CLOUDY and on the observations of Peimbert, Peimbert, & Ruiz. We find that approximately 45% of the H ionization photons escape from the H II region, providing an important ionizing source for the low-density interstellar medium of the SMC. The predicted I(4363)/I(5007) value is smaller than that observed, probably implying that there is an additional source of energy not taken into account by the models. From the ionization structure of the best model and the observed line intensities we determine the abundances of N, Ne, S, Ar, and Fe relative to O.