Optical spectroscopy of four young radio sources |
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| Institution: | 1. Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, China;2. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China;3. Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road,Beijing 100049, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8551, Japan;2. Earth-Life Science Institute,Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan;3. Department of Planetology, Graduate School of Science, Faculty of Science, Kobe University 1-1, Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan;4. RIKEN Advanced Institute for Computational Science, Minatojima-minamimachi, Chuo-ku, Kobe, Hyogo, 650-0047, Japan;1. Astronomy Dept. and Meteorology, Faculty of Science, Al-AzharUniversity, Cairo, Egypt;2. Astronomy Dept., National Research Institute of Astronomy and Geophysics, Helwan, Cairo, Egypt;3. Kottamia Center of Scientific Excellence in Astronomy and Space Sciences (KCScE), Cairo, Egypt;1. Department of Mechanical Engineering, National University of Singapore, Singapore 117576, Singapore;2. Department of Mechanical Engineering, University of North Carolina at Charlotte, NC-28223-0001, USA;1. Astronomy Dept., National Research Institute of Astronomy and Geophysics, Box: 138, 11421, Helwan, Cairo, Egypt;2. Kottamia Center of Scientific Excellence in Astronomy and Space Sciences (KCScE) STDF, ASRT, Cairo, Egypt;3. Physics Dept., College of Science, Northern Border University, 1320, Arar, Saudi Arabia;4. Astronomy Dept. and Meteorology, Faculty of Science, Al-Azhar University, Cairo, Egypt;1. Florida Institute of Technology, Physics and Space Sciences Department, Melbourne, Florida, 32901, USA;2. Florida Institute of Technology, Systems Engineering Department, Melbourne, Florida, 32901, USA |
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| Abstract: | We report the optical spectroscopy of four young radio sources which are observed with the Lijiang 2.4 m telescope. The Eddington ratios of these sources are similar with those of narrow-line Seyfert 1 galaxies (NLS1s). Their Fe ii emission is strong while O 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 4C 12.50 is the blue wing of the narrow component, but not from the broad line region. |
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