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arXiv 0901.1186astro-ph.COastro-ph.GA
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在HII星系中模拟星暴:我们需要什么来拟合观测结果?

Modelling Starbursts in HII Galaxies: What do we need to fit the observations?

M. L. Martin-Manjon, M. Molla, A. I. Diaz, R. Terlevich

摘要:

我们已经计算了一系列现实的和自洽的模型,已被证明能够再现恒星爆发场景中的HII星系的发射光谱(Martin-Majon et al. 2008)。我们的模型结合了不同的化学进化,进化的人口合成和光电离的代码。HII星系的发射光谱是通过光电离代码CLOUDY(Ferland,1998)再现的,电离光谱使用的是模拟的HII星系的光谱能量分布(SED),使用新的和更新的恒星星族模型PopStar(Molla & Garcia-Vargas 2009,准备)计算。这反过来又是根据恒星形成历史和化学演化模型给出的金属丰度演化计算出来的。每个模型的特征在于三个参数,这将决定模型星系的演化:恒星形成的初始效率,爆发发生的方式,以及这些爆发之间的分离时间。这里显示了这三个参数的不同值组合产生的一些模型结果。我们的技术再现观测到的丰度,诊断图和等效的宽色关系的本地HII星系。

英文摘要:

We have computed a series of realistic and self-consistent models that have been shown to be able to reproduce the emitted spectra of HII galaxies in a star bursting scenario (Martin-Majon et al. 2008). Our models combine different codes of chemical evolution, evolutionary population synthesis and photoionization. The emitted spectrum of HII galaxies is reproduced by means of the photoionization code CLOUDY (Ferland, 1998), using as ionizing spectrum the spectral energy distribution (SED) of the modelled HII galaxy, calculated using the new and updated stellar population models PopStar (Molla & Garcia-Vargas 2009, in prep.).This, in turn, is calculated according to a star formation history and a metallicity evolution given by a chemical evolution model. Each model is characterized by three parameters which are going to determine the evolution of the modeled galaxy: an initial efficiency of star formation, the way in which burst take place, and the time of separation between these bursts. Some model results emerging from the combination of different values for these three parameters are shown here. Our technique reproduces observed abundances, diagnostic diagrams and equivalent width-colour relations for local HII galaxies.

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