|
|||||
|
|
The continuum spectra of four PG quasars and their infrared emission mechanism |
|
| Authors: | Jian-xin Wu You-yuan Zhou |
| Institution: | 1 Department of Physics, South China Normal University, Guangzhou 510631, China 2 Joint Laboratory of Optical Astronomy, Chinese Academy of Sciences, China 3 Centre for Astrophysics, University of Sciences & Technology of China, Hefei 230026, China |
| Abstract: | In the present paper, the continua of four PG quasars from X-ray regions through the far-infrared are discussed. The spectral energy distributions show a variety of shapes which can be explained by combining five components in varying proportions. Nonthermal emission and thermal dust emission both contribute substantially to the infrared bump. For all four quasars discussed, the nonthermal emission, spanning at least five decades of frequencies, is found by our model to have a power-law index near unity. The nonthermal process is found to have produced the uniform-energy-distribution status of νfν const. The contributions from the host galaxy and starburst region near the nuclei are negligible in the infrared for luminous quasars. |
| Keywords: | galactic nuclei radiation mechanisms |
| 本文献已被 ScienceDirect 等数据库收录！ | |