Optical integral field spectroscopy observations applied to simulated galaxies: testing the fossil record method
Optical integral field spectroscopy observations applied to simulated galaxies: testing the fossil record method
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DOI：
10.1093/mnras/sty3256
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发表时间：
2018-11
影响因子：
4.8
通讯作者：
H. Ibarra-Medel;V. Avila-Reese;S. S'anchez;A. Gonz'alez-Samaniego;A. Rodr'iguez-Puebla
中科院分区：
文献类型：
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作者：
H. Ibarra-Medel;V. Avila-Reese;S. S'anchez;A. Gonz'alez-Samaniego;A. Rodr'iguez-Puebla
通过后处理的宇宙流体动力学模拟，我们探索了化石记录方法恢复恒星质量、年龄梯度以及用光学积分场统一观测到的星系的全局/径向恒星形成和质量增长历史的能力。我们对具有代表性的银河系大小的星系进行了两种模拟，一个以圆盘为主，另一个以核球为主。我们生成模拟 MaNGA/SDSS-IV 仪器和观测条件的数据立方体，并使用 Pipe3D 管道对其进行分析。对于最佳的 MaNGA 仪器/观测设置，两个星系的整体质量、年龄和尘埃消光都在不确定性范围内得到了很好的恢复，而对于径向分布，趋势是比真实的年龄梯度稍微平坦，由内而外的增长模式更弱。主要偏差是在内部、较老的区域恢复较年轻的恒星种群，在外部、较年轻的区域恢复稍老的恒星种群，以及较低的全球恒星质量。随着空间采样/分辨率较低（纤维数量较少）、观测到的星系更加倾斜和尘埃衰减、信噪比较低以及视宁度较差，这些趋势会增强。与更早且更连贯地聚集的核球主导星系相比，具有显着的由内向外生长模式的盘主导星系的恢复特性和历史受到的影响更大。我们公开了本文中使用的代码和模拟 IFU 数据立方体。
By means of post-processed cosmological Hydrodynamics simulations we explore the ability of the fossil record method to recover the stellar mass, age gradients, and global/radial star formation and mass growth histories of galaxies observed with an optical Integral Field Unity. We use two simulations of representative Milky Way-sized galaxies, one disk dominated and another bulge-dominated. We generate data cubes emulating MaNGA/SDSS-IV instrumental and observational conditions, and analyze them using the Pipe3D pipeline. For optimal MaNGA instrumental/observational setups, the global masses, ages, and dust extinctions of both galaxies are well recovered within the uncertainties, while for the radial distributions, the trend is to get slightly flatter age gradients and weaker inside-out growth modes than the true ones. The main bias is in recovering younger stellar populations in the inner, older regions, and slightly older stellar populations in the outer, younger regions, as well as lower global stellar masses. These trends are enhanced as lower is the spatial sampling/resolution (less number of fibers), more inclined and dust-attenuated is the observed galaxy, lower is the signal-to-noise ratio, and worse is the seeing. The recovered properties and histories are more affected for the disk-dominated galaxy with a prominent inside-out growth mode than for the bulge-dominated galaxy assembled earlier and more coherently. We make publicly available the code and the mock IFU datacubes used in this paper.