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首页> 外文期刊>Chinese Journal of Astronomy and Astrophysics >Chemical Evolution of Blue Compact Galaxies
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Chemical Evolution of Blue Compact Galaxies

机译:蓝色致密星系的化学演化

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摘要

Based on a sample of 72 Blue Compact Galaxies (BCGs) observed with the 2.16 m telescope of the National Astronomical Observatories, Chinese Academy of Sciences (NAOC) and about 4000 strong emission line galaxies from the Sloan Digital Sky Survey, we analyzed their chemical evolution history using the revised chemical evolution model of Larsen et al. Our sample covers a much larger metallicity range (7.2 < 12 + log(O/H) < 9.0). We found that, in order to reproduce the observed abundance pattern and gas fraction over the whole metallicity range, a relatively continuous star formation history is needed for high metallicity galaxies, while assuming a series of instantaneous bursts with long quiescent periods (some Gyrs) for low metallicity galaxies. Model calculations also show that only the closed-box model is capable of reproducing the observational data over the whole metallicity range. Models that consider the ordinary winds and/or inflow can only fit the observations in the low metallicity range, and a model with enriched wind cannot fit the data in the whole metallicity range. This implies that the current adopted simple wind and inflow models are not applicable to massive galaxies, where the underlying physics of galactic winds or inflow could be more complicated.
机译:根据中国科学院国家天文台2.16 m望远镜观测到的72个蓝色紧凑星系(BCG)和斯隆数字天空调查中约4000个强发射线星系,我们分析了它们的化学演化使用修改过的拉森(Larsen)等人的化学演化模型的历史。我们的样品覆盖了更大的金属范围(7.2 <12 + log(O / H)<9.0)。我们发现,为了重现整个金属度范围内观测到的丰度模式和气体分数,对于高金属度星系,需要相对连续的恒星形成历史,而同时假设一系列具有长静态周期(某些Gyrs)的瞬时爆发。低金属性星系。模型计算还表明,只有密闭盒模型才能在整个金属度范围内再现观测数据。考虑普通风和/或入流的模型只能拟合低金属度范围内的观测值,而具有丰富风的模型不能适合整个金属度范围内的数据。这意味着当前采用的简单风和入流模型不适用于大型星系,因为星系风或入流的基本物理原理可能会更加复杂。

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