Inferring the star formation histories of massive quiescent galaxies with BAGPIPES: evidence for multiple quenching mechanisms
Inferring the star formation histories of massive quiescent galaxies with BAGPIPES: evidence for multiple quenching mechanisms
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DOI：
10.1093/mnras/sty2169
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发表时间：
2018-11-01
影响因子：
4.8
通讯作者：
Dave, R.
中科院分区：
文献类型：
--
作者：
Carnall, A. C.;McLure, R. J.;Dave, R.
我们提出了贝叶斯分析Galerkin的物理推断和参数估计，或BAGPIPES，一个新的PYTHON工具，可用于快速生成复杂的模型星系光谱，并适合这些光谱和光度数据的任意组合使用MULTINEST嵌套采样算法。我们广泛地测试了恢复真实的星星形成历史（SFHS）的拟合模拟观测静止星系的MUFASA模拟。然后，我们对UltraVISTA中9289个静止星系的SFH进行了详细的分析，这些星系的恒星质量，M-* > 10（10）M圆点，红移为0.25 < z < 3.75。我们的大多数样品表现出SFH逐渐上升，然后在1 - 2 Gyr内相对快速地淬灭。这种行为与最近的宇宙学流体动力学模拟是一致的，其中活动星系核驱动的反馈在低吸积（喷流）模式是占主导地位的淬火机制。在z > 1时，我们还发现一类具有SFH的物体，它们的上升和下降非常迅速，猝灭时间尺度为3 Gyr，我们推测这是宇宙气体供应减少的结果。我们确认的质量加速演化（缩小）的趋势，并在更高的恒星质量更快速淬火的趋势。然而，我们的研究结果表明，后者是质量加速演化的自然结果，而不是淬火物理与恒星质量的变化。我们发现61 +/-8%的z > 1.5的猝灭星系在z = 0.5时经历了显著的进一步演化。BAGPIPES可在bagpipes.readthedocs.io上找到。
We present Bayesian Analysis of Galaxies for Physical Inference and Parameter EStimation, or BAGPIPES, a new PYTHON tool that can be used to rapidly generate complex model galaxy spectra and to fit these to arbitrary combinations of spectroscopic and photometric data using the MULTINEST nested sampling algorithm. We extensively test ourability to recover realistic star formation histories (SFHs) by fitting mock observations of quiescent galaxies from the MUFASA simulation. We then perform a detailed analysis of the SFHs of a sample of 9289 quiescent galaxies from UltraVISTA with stellar masses, M-* > 10(10) M-circle dot and redshifts 0.25 < z < 3.75. The majority of our sample exhibit SFHs that rise gradually then quench relatively rapidly over 1 -2 Gyr. This behaviour is consistent with recent cosmological hydrodynamic simulations, where AGN-driven feedback in the low-accretion (jet) mode is the dominant quenching mechanism. At z > 1, we also find a class of objects with SFHs that rise and fall very rapidly, with quenching time-scales of 3 Gyr, which we speculate to be the result of diminishing overall cosmic gas supply. We confirm the mass-accelerated evolution (downsizing) trend, and a trend towards more rapid quenching at higher stellar masses. However, our results suggest that the latter is a natural consequence of mass-accelerated evolution, rather than a change in quenching physics with stellar mass. We find 61 +/- 8 per cent of z > 1.5 massive-quenched galaxies undergo significant further evolution by z = 0.5. BAGPIPES is available at bagpipes.readthedocs.io.