Ultra-steep spectrum radio sources

We present the results of radio (VLA) and optical (ESO/La Silla) imaging of a sample of 52 radio sources having an ultra-steep radio spectrum with {alpha} mostly steeper than...本研究呈现了52个具有超陡射电频谱、且频谱指数α大多陡于……的射电源样本的射电（甚大天线阵(VLA)）与光学（欧洲南方天文台/拉西拉天文台）成像观测结果。