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首页> 外文期刊>The Astrophysical journal >SPECTROPHOTOMETRY AND STELLAR POPULATION MODELS OF 'E + A' GALAXIES
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SPECTROPHOTOMETRY AND STELLAR POPULATION MODELS OF 'E + A' GALAXIES

机译：“ E + A”星系的分光光度法和恒星种群模型

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摘要

We present long-slit spectrophotometry of eight "E + A" galaxies which have been previously identified in the literature. We use a simple two-parameter modeling scheme to test if their stellar populations can be characterized uniquely by a decaying instantaneous starburst of well-determined age superposed upon a steady state galaxy substrate. Five of the objects are well characterized by burst-plus-elliptical galaxy models; two others are best fit by burst-plus-spiral galaxy models. One object cannot be described by such models, but it does resemble the spectra of some nearby merging galaxies with E + A-like spectra, possibly suggesting a multiple-burst scenario. Significant degeneracies, however, combined with the finite signal-to-noise of the data, severely limit the effectiveness of using optical spectral energy distributions alone to constrain the ages and mass fractions of the starburst components. The interpretation of E + A galaxies, especially at high redshift, must be approached cautiously.
机译：我们提出了八个“ E + A”星系的长缝分光光度法，这些星系先前已在文献中确定。我们使用简单的两参数建模方案来测试其恒星种群是否可以通过叠加在稳态星系底物上的，年龄确定的衰变瞬时星爆来唯一表征。其中五个天体的特征是爆发加椭圆星系模型。爆裂加螺旋星系模型最适合另两个。用这样的模型无法描述一个物体，但它确实类似于附近一些合并星系的光谱，且具有类似E + A的光谱，可能暗示了多次爆发的情况。但是，显着的简并性与数据的有限信噪比相结合，严重限制了仅使用光谱能量分布来约束星爆组件的年龄和质量分数的有效性。 E + A星系的解释，尤其是在高红移时，必须谨慎对待。

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