Variable 1.4GHz radio sources from NVSS and FIRST

We augment the two widest/deepest 1.4GHz radio surveys, the NRAO VLA Sky Survey (NVSS) and the Faint Images of the Radio Sky at Twenty centimeters (FIRST), with the mean epoch...本研究针对两项覆盖范围最广、探测深度最深的1.4GHz射电巡天项目——美国国家射电天文台甚大阵天空巡天（NRAO VLA Sky Survey, NVSS）与20厘米射电天空暗弱图像巡天（Faint Images of the Radio Sky at Twenty Centimeters, FIRST），以平均观测历元作为补充信息完成了数据扩充。