限制星系物理参数的不同类型静止框架光学观测的相对优点
Relative merits of different types of rest-frame optical observations to constrain galaxy physical parameters
摘要：
我们提出了一种新的方法来约束星系的物理参数从恒星和星云的发射在广泛的观测范围内的综合解释。这种方法依赖于贝叶斯分析任何类型的星系光谱能量分布，使用一个综合的合成光谱库，该综合光谱库使用最先进的恒星形成和化学富集历史、恒星星族合成、星云发射和尘埃衰减模型组装而成。我们专注于5波段测光和低，中分辨率光谱学在光学静止波长上的一组物理参数表征的恒星和星际介质的约束。由于这些参数不能已知的任何星系样本的先验，我们评估的准确性，他们可以通过模拟“伪观测”使用已知参数的模型检索。假设这些模型是很好的近似真实的星系，我们发现，在低分辨率星系光谱的恒星和星云发射的综合分析提供了有价值的限制所有的物理参数。在更高的分辨率下，在12,660 SDSS恒星形成星系的合并恒星和星云发射的分析，使用我们的方法产生的恒星质量，气相氧丰度，光学深度的尘埃和特定的恒星形成率的似然分布类似于在原来的（两倍高）SDSS光谱分辨率的恒星和星云发射的先前单独的分析。我们发现，来自这些不同类型的观测星系物理参数的约束敏感地依赖于信噪比。我们的方法可以扩展到分析光谱演化模型所覆盖的波长范围内的任何类型的观测。[删节]
英文摘要：
We present a new approach to constrain galaxy physical parameters from the combined interpretation of stellar and nebular emission in wide ranges of observations. This approach relies on the Bayesian analysis of any type of galaxy spectral energy distribution using a comprehensive library of synthetic spectra assembled using state-of-the-art models of star formation and chemical enrichment histories, stellar population synthesis, nebular emission and attenuation by dust. We focus on the constraints set by 5-band photometry and low- and medium-resolution spectroscopy at optical rest wavelengths on a set of physical parameters characterizing the stars and the interstellar medium. Since these parameters cannot be known a priori for any galaxy sample, we assess the accuracy to which they can be retrieved by simulating `pseudo-observations' using models with known parameters. Assuming that these models are good approximations of true galaxies, we find that the combined analysis of stellar and nebular emission in low-resolution galaxy spectra provides valuable constraints on all physical parameters. At higher resolution, the analysis of the combined stellar and nebular emission in 12,660 SDSS star-forming galaxies using our approach yields likelihood distributions of stellar mass, gas-phase oxygen abundance, optical depth of the dust and specific star formation rate similar to those obtained in previous separate analyses of the stellar and nebular emission at the original (twice higher) SDSS spectral resolution. We show that the constraints derived on galaxy physical parameters from these different types of observations depend sensitively on signal-to-noise ratio. Our approach can be extended to the analysis of any type of observation across the wavelength range covered by spectral evolution models. [abridged]
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