识别ZTF DR3数据集中的RR溶血素
Identifying RR Lyrae in the ZTF DR3 dataset
摘要：
我们提出了一个RR天琴座（RRL）目录的基础上的Zwicky瞬态设施（ZTF DR 3）和\textit{Gaia} EDR 3的第三次数据发布的组合。我们使用一个多步骤的分类流水线依赖于傅立叶分解拟合多波段ZTF光变曲线和随机森林分类。由此产生的目录包含71，755个具有周期和光变曲线参数测量的RRL，并且相对于SOS \textit{Gaia} DR 2 RRL，完整性为0.92，纯度为0.92。该星表覆盖北半球的天区，其完整性为$\geq -28^\circ$，日心距为$\leq 80$ ~kpc，最远的RRL为132~kpc。与其他几个北半球的RRL星表相比，我们的星表在星系晕附近有更多的RRL，在低银河纬度地区也更完整。通过分析星表中RRL的空间分布，揭示了之前已知的星系晕的主要超密度，如室女座超密度和武仙座-天鹰座云，以及两者之间存在关联的一些证据。我们还分析了Oosterhoff分数在整个晕的差异，比较它的密度分布，发现增加Oosterhoff我分数在椭圆半径16和32千秒差距之间的一些证据，不同的Oosterhoff分数跨越各种晕子结构。
英文摘要：
We present a RR Lyrae (RRL) catalogue based on the combination of the third data release of the Zwicky Transient Facility (ZTF DR3) and \textit{Gaia} EDR3. We use a multi-step classification pipeline relying on the Fourier decomposition fitting to the multi-band ZTF light curves and random forest classification. The resulting catalogue contains 71,755 RRLs with period and light curve parameter measurements and has completeness of 0.92 and purity of 0.92 with respect to the SOS \textit{Gaia} DR2 RRLs. The catalogue covers the Northern sky with declination $\geq -28^\circ$, its completeness is $\gtrsim 0.8$ for heliocentric distance $\leq 80$~kpc, and the most distant RRL at 132~kpc. Compared with several other RRL catalogues covering the Northern sky, our catalogue has more RRLs around the Galactic halo and is more complete at low Galactic latitude areas. Analysing the spatial distribution of RRL in the catalogue reveals the previously known major over-densities of the Galactic halo, such as the Virgo over-density and the Hercules-Aquila Cloud, with some evidence of an association between the two. We also analyse the Oosterhoff fraction differences throughout the halo, comparing it with the density distribution, finding increasing Oosterhoff I fraction at the elliptical radii between 16 and 32 kpc and some evidence of different Oosterhoff fractions across various halo substructures.
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