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arXiv 2202.07518astro-ph.GA
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CALIFA调查中的HII地区:II。它们的物理性质与星系演化的关系

HII regions in CALIFA survey: II. The relation between their physical properties and galaxy evolution

C. Espinosa-Ponce, S. F. Sánchez, C. Morisset, J. K. Barrera-Ballesteros, L. Galbany, R. García-Benito, E. A. D. Lacerda, D. Mast

摘要:

在这里,我们提出了探索的物理性质的样本的HII区域和聚集的最后HII区域目录的CALIFA调查。该样本包括积分场光谱数据中对应于924个星系的超过26,000个电离区域的光谱特性,包括通量强度和等效宽度以及其基础恒星星族的特性。在目前的研究中,我们根据这些性质推导出所有这些区域的一组物理量,包括:(i)年轻恒星的比例;(ii)电离强度(使用6种不同的估计);(iii)氧丰度(使用25种不同的校准器);(iv)氮和氮氧丰度;(v)尘埃消光和(vi)电子密度。使用这个数据集,我们探讨了如何在经典的诊断图的轨迹与这些数量,这些参数的径向分布,以及它们之间的相互关系,并与底层的恒星星族的属性。我们的结论是,许多性质的HII区密切相关的银河系恒星演化在这些地区的观察位置。这些性质只作为二级效应受到电离星和电离星云性质的调制,而这些性质并不取决于它们形成的天体物理背景。我们的研究结果突出了HII区域在探索星系化学演化中的重要性,澄清了它们的哪些属性可以用作这种演化的代理。

英文摘要:

We present in here the exploration of the physical properties of the sample of HII regions and aggregations of the last HII regions catalog of the CALIFA survey. This sample comprises the optical spectroscopic properties of more than ~26,000 ionized regions corresponding to 924 galaxies from the Integral Field Spectroscopy data, including the flux intensity and equivalent widths and the properties of their underlying stellar population. In the current study we derive a set of physical quantities for all these regions based on those properties, including (i) the fraction of young stars; (ii) the ionization strength (using six different estimations); (iii) the oxygen abundance (using 25 different calibrators); (iv) the nitrogen and nitrogen-to-oxygen abundance; (v) the dust extinction and (vi) the electron density. Using this dataset we explore how the loci in the classical diagnostic diagrams are connected with those quantities, the radial distributions of these parameters, and the inter-relations between themselves and with the properties of the underlying stellar populations. We conclude that many properties of the HII regions are tightly related to the galactic stellar evolution at the location where those regions are observed. Those properties are modulated only as a second-order effect by the properties of the ionizing stars and the ionized nebulae that do not depend on the astrophysical context in which they are formed. Our results highlight the importance of HII regions to explore the chemical evolution in galaxies, clarifying which of their properties can be used as proxies of that evolution.

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