通过软度参数研究银盘上HII区电离辐射的硬化
On the hardening of the ionizing radiation in HII regions across galactic discs through softness parameters
摘要：
本文研究了HII区电离团簇的辐射硬度。首先，我们探讨了软参数的适用性，最初定义在光学对连续的电离阶段相同的物种。随着红外空间天文台的出现，这一定义已扩展到中红外。我们表明，柔软度参数，确定在光学和中红外波长，是敏感的有效温度使用的样本中的两个光谱制度的数据。这一点可以通过与光电离模型网格的数据比较得到证实，尽管即使对于不同的恒星模型大气，也没有发现完全一致的结果。最后，我们表明，这两个软参数是一致的，在螺旋星系盘的HII区域的电离辐射的硬度的径向变化的搜索。我们发现了一系列的趋势，从显示明显梯度的星系到显示非常平坦的星系。虽然这些梯度的可探测性和斜率可以通过所研究的HII区域的大小和光度来改变，但看起来它们的存在与星系的质量和类型有关，因此与整个盘的性质有关。
英文摘要：
We carry out a study of the hardness of the radiation of ionizing clusters in HII regions. Firstly, we explore the applicability of the softness parameter, originally defined in the optical for pairs of consecutive ionization stages of the same species. With the advent of the infrared space observatories, this definition has been extended to the mid-infrared. We show that the softness parameters, as determined both in the optical and the mid-infrared wavelengths, are sensitive to the effective temperature using a sample of data in both spectral regimes. This is confirmed by comparing the data with a grid of photoionization models, although no complete agreement has been found even for different stellar model atmospheres. Finally, we show that both softness parameters are consistent in the search for radial variations of the hardness of the ionizing radiation of HII regions in the discs of spiral galaxies. We find a range of trends, from galaxies showing pronounced gradients to those showing very flat ones. Although the detectability and slope of these gradients can be altered by the size and luminosity of the studied HII regions, it looks that their existence is related to the mass and type of the galaxies and, hence, to the roperties of the entire disc.
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