Optical properties of low z radio galaxies |
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| Institution: | 1. Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218, USA;2. Padua Observatory, Vicolo dell’Osservatorio 5, I-30122, Padova, Italy;1. Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, 910095, Guangdong, China;2. Department of Surgery, Nanjing Lishui People’s Hospital, Nanjing, 211200, Jiangsu, China;3. Institute of New Drug Development and Center for Tumor Medical Science, China Medical University, Taichung, 404, Taiwan;4. Institute of Clinical Medicine, National Yang-Ming University, Taipei, 11221, Taiwan;5. Department of Biomedical Sciences, College of Medicine, Inha University, Incheon, 22212, South Korea;6. Graduate Institute of Biomedical Sciences and Centers for Molecular Medicine and Tumor Medical Science, China Medical University, Taichung, 40402, Taiwan;7. Cancer Progression Research Center, National Yang-Ming University, Taipei, 11221, Taiwan;8. Division of Medical Oncology, Department of Oncology, Taipei Veterans General Hospital, Taipei, 11217, Taiwan;1. S. N. Bose National Centre for Basic Sciences, Kolkata 700106, India;2. Midnapore City College, Kuturiya, Bhadutala 721129, India |
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| Abstract: | The optical morphological and photometric properties of 79 low redshift radio galaxies are discussed. It is found that most radio galaxies are luminous bulge dominated systems similar to normal non-radio giant ellipticals. The average absolute magnitude of the sample is 〈MHOST(tot)〉=?23.98, with a clear trend for FR I sources to be ～0.5 mag brighter than FR II galaxies. In about 40% of the objects we find an excess of light in the nucleus attributable to the presence of a nuclear point source. This contributes on average for ～1–2% of the total flux from the host galaxy. Radio galaxies follow the same μe?Re relationship of normal (non-active) elliptical galaxies. The distribution of ellipticity, the amount of twisting and shape of isophotes do not differ significantly from other ellipticals. These results support a scenario where radio emission is little related with the overall properties of the host galaxy. |
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