标题： 一种从星系光谱恢复恒星形成历史和消光性质的反演方法。 应用于NGC 7714 显示英文标题

标题： An inverse method to recover the star formation history and reddening properties of a galaxy from its spectrum. Application to NGC 7714

摘要： 我们开发了一种非参数逆向方法，基于星系的光谱能量分布（SEDs），研究恒星形成率、金属丰度演化和星系的消光特性。 这种方法允许我们根据数据的信噪比（S/N）来明确其中包含的信息水平。 当紫外、光学和近红外波段的低分辨率SEDs同时可用时，我们得出结论，以信噪比25可以同时限制恒星形成率和有效尘埃光学深度。 在高信噪比的情况下，也可以限制年龄-金属丰度关系。 我们将此方法应用于已知的相互作用星系NGC 7714中的核区星暴。 我们专注于推导恒星形成率和消光定律。 我们证实经典的消光模型无法提供同时适合SED和谱线的可接受拟合。 我们还证实，除了当前的星暴外，还需要一场从200多百万年前开始的增强型恒星形成事件，这与采用的人口综合模型一致。 由于基于动力学研究，自上一次与NGC 7715的相互作用以来的时间约为1亿年，我们的结果加强了这种相互作用可能并非NGC 7714生命中最重要事件的建议。 显示英文摘要

摘要： We develop a non-parametric inverse method to investigate the star formation rate, the metallicity evolution and the reddening properties of galaxies based on their spectral energy distributions (SEDs). This approach allows us to clarify the level of information present in the data, depending on its signal-to-noise ratio (S/N). When low resolution SEDs are available in the ultraviolet, optical and near-IR wavelength ranges together, we conclude that it is possible to constrain the star formation rate and the effective dust optical depth simultaneously with a signal-to-noise ratio of 25. With excellent signal-to-noise ratios, the age-metallicity relation can also be constrained. We apply this method to the well-known nuclear starburst in the interacting galaxy NGC 7714. We focus on deriving the SFR and the reddening law. We confirm that classical extinction models cannot provide an acceptable simultaneous fit of the SED and the lines. We also confirm that, with the adopted population synthesis models and in addition to the current starburst, an episode of enhanced star formation that started more than 200 Myr ago is required. As the time elapsed since the last interaction with NGC 7715, based on dynamical studies, is about 100 Myr, our result reinforces the suggestion that this interaction might not have been the most important event in the life of NGC 7714.