Radio-loudness Statistics of Quasars from Quaia-VLASS (DATA AND CODE)

Here we present the catalog of Quaia-VLASS quasar cross-matches (optical and radio, respectively) accompanying the publication "Radio-loudness Statistics of Quasars from Quaia-VLASS", Arsenov et. al 2025, ApJS, https://doi.org/10.3847/1538-4365/adf056 The catalog covers the full sky above -40 degrees in declination and contains 43,650 quasar candidates, that have matches in the radio. With this number and coverage it is one of the largest catalogs (if not the largest) of quasars detected in the optical and radio to date (July 2025). The image further down on this page shows the contents of the catalog.The files presented here are: cross_match_cat__Quaia_VLASS.csv: the catalog of cross-matches, containing 21 columns of sources' properties. The same dataset, but saved as .txt and with a descriptive header, is also available at the ApJS webpage to the publication of this work: https://doi.org/10.3847/1538-4365/adf056 Radioloudness_paper_notebook_revision3_17_06_2025.ipynb: a Jupyter notebook in python language, that allows the user to reproduce our results, cross-matched catalog and the plots in the Arsenov et al. 2025 paper. For that, it is necessary to use the proper optical and radio input files - quaia_G20.5.fits from Storey-Fisher et al. 2023 (https://zenodo.org/records/10403370) and CIRADA_VLASS2QLv2_table1_components.csv (https://cirada.ca/vlasscatalogueql0, under "Component Table" for "Quick Look epoch 2 catalog of the entire sky") radioloudness_paper_notebook_revision3_17_06_2025.py: Same as the Jupyter notebook, but saved as a .py file If you encounter difficulties using the python code or the catalog, feel free to contact the first author at n e s t o r a r s e n o v _AT__ gmail --D O T- com本研究配套发布Quaia-VLASS类星体光学-射电交叉匹配目录，对应论文为Arsenov等人2025年发表于《天体物理学杂志增刊》（Astrophysical Journal Supplement Series，缩写ApJS）的《Quaia-VLASS类星体射电响度统计》（Radio-loudness Statistics of Quasars from Quaia-VLASS），DOI链接：https://doi.org/10.3847/1538-4365/adf056。 本目录覆盖赤纬-40°以上的全天区，共包含43650个完成射电波段匹配的类星体候选体。以样本规模与覆盖范围而言，这是截至2025年7月已公开的最大（若未达绝对最大也是同类目录中规模前列）的光学与射电联合探测类星体目录。本页面下方的图示展示了该目录的具体内容。 本次提供的文件如下： 1. cross_match_cat__Quaia_VLASS.csv：交叉匹配目录，包含21列源属性信息。该数据集同时提供了带描述性表头的TXT格式版本，可通过本论文的ApJS期刊页面获取：https://doi.org/10.3847/1538-4365/adf056。 2. Radioloudness_paper_notebook_revision3_17_06_2025.ipynb：Python语言编写的Jupyter笔记本，可用于复现Arsenov等人2025年论文中的研究结果、交叉匹配目录及相关绘图。使用时需导入配套的光学与射电波段输入文件：Storey-Fisher等人2023年发布的quaia_G20.5.fits（来源：https://zenodo.org/records/10403370），以及CIRADA_VLASS2QLv2_table1_components.csv（来源：https://cirada.ca/vlasscatalogueql0，可在“全天区快速检视纪元2目录”的“组件表”板块下载）。 3. radioloudness_paper_notebook_revision3_17_06_2025.py：与上述Jupyter笔记本功能完全一致的Python脚本文件。 若您在使用该Python代码或目录时遇到困难，可联系第一作者：[e-mail]（原邮箱格式经规范转换后为该地址）。