Shanghai Astronomical Observatory,Chinese Academy of Sciences
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    5837 research outputs found

    北斗三号星基增强与精密定位服务关键技术研究

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    氢原子钟远程监控与状态参数智能化诊断研究

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    空间VLBI数据格式解码和脉冲星相关处理技术研究

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    模糊聚类定权法对SLR 定轨精度的影响

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    霍曼转移轨道你了解吗?

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    联合卫星重力和GNSS观测反演地震断层参数的研究

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    Disentangling the formation history of galaxies via population-orbit superposition: method validation

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    We present population-orbit superposition models for external galaxies based on Schwarzschild's orbit-superposition method, by tagging the orbits with age and metallicity. The models fit the density distributions, kinematic, and age and metallicity maps from integral field unit (IFU) spectroscopy observations. We validate the method and demonstrate its power by applying it to mock data, similar to those obtained by the Multi-Unit Spectroscopic Explorer (MUSE) IFU on the Very Large Telescope (VLT). These mock data are created from Auriga galaxy simulations, viewed at three different inclination angles (theta = 40 degrees, 60 degrees, 80 degrees). Constrained by MUSE-like mock data, our model can recover the galaxy's stellar orbit distribution projected in orbital circularity lambda(z) versus radius r, the intrinsic stellar population distribution in age t versus metallicity Z, and the correlation between orbits' circularity lambda(z) and stellar age t. A physically motivated age-metallicity relation improves the recovering of intrinsic stellar population distributions. We decompose galaxies into cold, warm, and hot+counter-rotating components based on their orbit circularity distribution, and find that the surface density, velocity, velocity dispersion, and age and metallicity maps of each component from our models well reproduce those from simulation, especially for projections close to edge-on. These galaxies exhibit strong global age versus sigma(z) relation, which is well recovered by our model. The method has the power to reveal the detailed build-up of stellar structures in galaxies, and offers a complement to local resolved, and high-redshift studies of galaxy evolution

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    Shanghai Astronomical Observatory,Chinese Academy of Sciences is based in China
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