What Is Inside Matters: Simulated Green Valley Galaxies Have too Centrally Concentrated Star Formation
What Is Inside Matters: Simulated Green Valley Galaxies Have too Centrally Concentrated Star Formation
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DOI：
10.3847/2041-8213/ab0f34
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
T. Starkenburg;S. Tonnesen;Claire Kopenhafer
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文献类型：
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作者：
T. Starkenburg;S. Tonnesen;Claire Kopenhafer
在空间分辨星系观测中，恒星形成率(SFR)的径向轮廓被发现与总的比SFR相关。恒星形成中的中心损耗被认为与例如绿谷(GV)内的星系的全球压低的SFR有关。我们首次给出了来自Illustris和Eagle大型宇宙模拟的模拟星系的统计样本的径向特定SFR轮廓。对于恒星形成序列上的星系，模拟的特定SFR剖面与观测结果基本一致。然而，这两个星系样本都显示了在所有星系恒星质量的GV中星系的中心集中恒星形成，这表明猝灭发生在自外而内，与观测到的由内而外猝灭发生强烈冲突。模拟和观测之间的差异可能是由于当前大规模宇宙模拟中的恒星形成和反馈实施中的分辨率问题和/或可能的失败。我们的结论是，星系内恒星形成的分布对模拟和模型是一个很强的附加约束，特别是与恒星形成的猝灭有关的约束。
In spatially resolved galaxy observations, star formation rate (SFR) radial profiles are found to correlate with total specific SFRs. A central depletion in star formation is thought to correlate with the globally depressed SFRs of, for example, galaxies within the Green Valley (GV). We present, for the first time, radial specific SFR profiles for a statistical sample of simulated galaxies from the Illustris and EAGLE large cosmological simulations. For galaxies on the star-forming sequence, simulated specific SFR profiles are in reasonable agreement with observations. However, both galaxy samples show centrally concentrated star formation for galaxies in the GV at all galaxy stellar masses, suggesting that quenching occurs from the outside-in, in strong conflict with observations of inside-out quenching. This difference between simulations and observations may be due to resolution issues and/or possible failures in the star formation and feedback implementation in current large-scale cosmological simulations. We conclude that the distribution of star formation within galaxies is a strong additional constraint for simulations and models, in particular, related to the quenching of star formation.