Quasar Feedback Survey 2: L-band maps

This data release is associated with the publication "The Quasar Feedback Survey: Revealing the importance of sensitive radio imaging deeper into the radio quiet regime", published in Njeri et al. (2025), MNRAS, under review.This work presents 1.4GHz and 6 GHz radio imaging, obtained from the Very Large Array for the 29 quasars from the extended sample, to lower luminosities (QFeedS-2), of the Quasar Feedback Survey (first presented in Jarvis et al. 2021, MNRAS, 503, 1780 https://doi.org/10.1093/mnras/stab549 ). These targets are z~0.1 quasar host galaxies, selected to be luminous in [O III] emission (L[O III] > 10^42.1erg/s). For full details of the survey description and sample selection see Njeri et al. (2025).This data release contains the L-band (1.4GHz) images produced from the Very Large Array (VLA), in A-array configuration, for each of the sources. However, although 29 sources are in the survey, 3 sources were not observed in the L-band (J0213+0042, J0232−0811 and J2304−0841). Therefore, there are 26 L-band images in this data release. The raw VLA data were obtained under proposal ID 23A-214.All normal metadata, associated with astronomical images (observation details, source details, process of imaging), is included with the fits files.We used the VLA Calibration Pipeline 2024.1.0.8 for casa version 6.6.1 to reduce our data. Imaging was performed using the casa tclean algorithm with Briggs weighting of r=0.5 for all radio maps.

本数据发布关联于论文《类星体反馈巡天：揭示高灵敏度射电成像在更深入射电宁静区域的重要性》（The Quasar Feedback Survey: Revealing the importance of sensitive radio imaging deeper into the radio quiet regime），该论文由Njeri等人（2025）撰写，目前已提交至《皇家天文学会月报》（Monthly Notices of the Royal Astronomical Society, MNRAS）处于审稿状态。本工作基于甚大阵（Very Large Array, VLA）对扩展样本中的29颗类星体开展1.4GHz与6GHz射电成像观测，将类星体反馈巡天（Quasar Feedback Survey，首次由Jarvis等人于2021年发表于《皇家天文学会月报》503卷1780页，DOI: 10.1093/mnras/stab549）的探测极限拓展至更低光度区间，对应样本记为QFeedS-2。这些目标为红移z~0.1的类星体宿主星系，筛选标准为[O III]发射线光度L[O III] > 10^42.1 erg/s。关于本次巡天的完整描述与样本选择细节，请参见Njeri等人（2025）的相关研究。本次数据发布包含所有源的甚大阵L波段（1.4GHz）成像数据，观测采用A阵构型。尽管本巡天共包含29个源，但其中3个源（J0213+0042、J0232−0811与J2304−0841）未在L波段开展观测，因此本次数据发布中共包含26幅L波段成像文件。原始甚大阵数据的观测提案编号为23A-214。所有与天文图像相关的标准元数据（含观测细节、源信息、成像处理流程）均已包含在FITS（Flexible Image Transport System）格式文件中。我们使用适配CASA 6.6.1版本的VLA校准流水线2024.1.0.8完成数据校准，并采用CASA tclean算法对所有射电图进行成像，成像过程中采用r=0.5的Briggs加权方案。