We report the optical spectroscopy of four young radio sources which are observed with the Lijiang 2.4m telescope. The Eddington ratios of these sources are similar with those of narrow-line Seyfert 1 galaxies (NLS1s). Their Fe {\sc ii} emission is strong while [O {\sc iii}] strength is weak. These results confirm the NLS1 features of young radio sources, except that the width of broad Hβ of young radio sources is larger than that of NLS1s. We thus suggest that the young radio sources are the high black hole mass counterparts of steep-spectrum radio-loud NLS1s. In addition, the broad Hβ component of \astrobj{4C 12.50} is the blue wing of the narrow component, but not from the broad line region.
@article{arxiv.1607.06937,
title = {Optical Spectroscopy of Four Young Radio Sources},
author = {Xu-Liang Fan and Jin-Ming Bai and Chen Hu and Jian-Guo Wang},
journal= {arXiv preprint arXiv:1607.06937},
year = {2016}
}
Comments
11 pages, 5 Figures, 2 Tables, accepted by New Astronomy