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arXiv 0909.1573astro-ph.CO
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猝灭星形成:AGN能做到这一点吗?

Quenching Star Formation: Can AGN Do the Trick?

Jared M. Gabor, Romeel Davé

摘要:

我们在宇宙流体力学模拟中对星系恒星形成历史进行后处理,以测试与活动星系核相关的猝灭机制。通过比较模拟结果的颜色星等图和光度函数的SDSS星系,我们检查是否“类星体模式”或“无线电模式”活动星系核反馈可以产生一个现实的红色序列。这两种情况都产生了与蓝色云不同的红色序列,与光度函数相当匹配,以及在g-r中太蓝约0.1等的星系。然而,我们基于合并的类星体模式反馈的处方产生了与观测不一致的红色序列:光度函数缺乏特征膝盖,最亮的星系包括少量的年轻恒星。

英文摘要:

We post-process galaxy star formation histories in cosmological hydrodynamics simulations to test quenching mechanisms associated with AGN. By comparing simulation results to color-magnitude diagrams and luminosity functions of SDSS galaxies, we examine whether "quasar mode" or "radio mode" AGN feedback can yield a realistic red sequence. Both cases yield red sequences distinct from the blue cloud, decent matches to the luminosity function, and galaxies that are too blue by about 0.1 magnitudes in g-r. Our merger-based prescription for quasar mode feedback, however, yields a red sequence build-up inconsistent with observations: the luminosity function lacks a characteristic knee, and the brightest galaxies include a small number of young stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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