论文标题
迈向完全一致的银河系磁盘模型V。磁盘型号4 $ - $ 14 kpc
Towards a fully consistent Milky Way disk model V. The disk model for 4 $-$ 14 kpc
论文作者
论文摘要
我们提出了银河系磁盘的半分析恰好恰好（JJ）模型的广义版本，该模型结合了我们针对太阳能社区的发现，并且适用于多种半乳房距离，4 kpc $ \ lyssim r \ Lessim r \ Lessim r \ Lesssim $ 14 kpc $ 14 kpc。 JJ模型是恒星种群合成的灵活工具，年龄分辨率为25 MYR。它包括六个乳白色（MW）组件：四个扁平的（指数薄和厚的磁盘，原子和分子气）和两个球体（球形恒星晕和一个芯等温线暗物质球）。尽管也可以测试燃烧，但假定所有半径在所有半径上都假定薄盘厚度是恒定的。薄盘恒星形成率（SFR）的径向变化反映了内而外的磁盘生长方案。我们允许通过任意数量的高斯峰来修改平滑的功率SFR连续体。我们提出了JJ模型的公共代码，并由三组等速线（Parsec，Mist和Basti）进行补充。利用Apogee红色团块巨头的金属性分布，我们限制了JJ-Model年龄金属关系（AMR）的径向变化，并为AMR函数提出了一种新的分析形式。广义JJ模型是一种用于研究MW磁盘上不同恒星种群的公开工具。凭借其良好的年龄分辨率和灵活性，它对于重建薄磁盘SFR可能特别有用，因为可以在其框架内构建各种不同的SFR形状。
We present a generalised version of the semi-analytic Just-Jahreiss (JJ) model of the Galactic disk that incorporates our findings for the solar neighbourhood and is applicable to a wide range of galactocentric distances, 4 kpc $\lesssim R \lesssim $ 14 kpc. The JJ model is a flexible tool for stellar population synthesis with a fine age resolution of 25 Myr. It includes six Milky-Way (MW) components: the four flattened (exponential thin and thick disk, atomic and molecular gas) and two spheroidal (spherical stellar halo and a cored isothermal dark matter sphere). The overall thin-disk thickness is assumed to be constant at all radii, though flaring can also be tested. The adopted radial variation in the thin-disk star-formation rate (SFR) reflects the inside-out disk growth scenario. We allow a smooth power-law SFR continuum to be modified by an arbitrary number of Gaussian peaks. We present a public code of the JJ model complemented by the three sets of isochrones (PARSEC, MIST, and BaSTI). Using metallicity distributions of the red clump giants from APOGEE, we constrain the radial variation of the JJ-model age-metallicity relation (AMR) and propose a new analytic form for the AMR function. The generalised JJ model is a publicly available tool for studying different stellar populations across the MW disk. With its fine age resolution and flexibility, it can be particularly useful for reconstructing the thin-disk SFR, as a variety of different SFR shapes can be constructed within its framework.
