The X and UV emissions of active galactic nuclei
| Autor: | Li-hong Cao, Jun-han You, Ru-liang Liu, Fu-zhen Ckeng |
|---|---|
| Rok vydání: | 1987 |
| Předmět: |
Physics
Active galactic nucleus Astrophysics::High Energy Astrophysical Phenomena Synchrotron radiation Astronomy Astronomy and Astrophysics Quasar Context (language use) Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics medicine.disease_cause Galaxy Luminosity Space and Planetary Science Radiative transfer medicine Astrophysics::Solar and Stellar Astrophysics High Energy Physics::Experiment Astrophysics::Galaxy Astrophysics Ultraviolet |
| Zdroj: | Chinese Astronomy and Astrophysics. 11:94-99 |
| ISSN: | 0275-1062 |
| DOI: | 10.1016/0275-1062(87)90030-0 |
| Popis: | A statistical analysis of 87 optical selected quasars and 30 type I Seyfert galaxies is carried out in this paper. Using a quasi-Monte-Carlo method, the relation between the 2 keV monochromatic X-ray luminosity 1X and ∼2500A monochromatic ultraviolet luminosity is calculated and the result is: 1x ∝ 10bp, b = 0.93 ± 0.18 when the accretion rate ⪡ cr, and b = 0.28 ± 0.18 when > cr. A detailed semi-quantitative physical discussion of our results ruled out many available radiative mechanisms. We conclude that the most plausible dominant radiation in the band from 2500A UV to 2 keV soft X-ray is non-thermal synchrotron radiation. We discuss that when the accretion rate is growing, most of the X radiation is dragged into the black hole (the dragging effect). This is the main reason why the X-ray luminosity increases much more slowly with M than does the UV luminosity. Finally, in the context of pure luminosity evolution, we have obtained that 1x evolves more slowly than does 10p. |
| Databáze: | OpenAIRE |
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