Is there a dichotomy in the radio loudness distribution of quasars?
| العنوان: | Is there a dichotomy in the radio loudness distribution of quasars? |
|---|---|
| المؤلفون: | Luigi Danese, Annalisa Celotti, Michele Cirasuolo, Manuela Magliocchetti |
| المصدر: | Monthly Notices of the Royal Astronomical Society. 346:447-455 |
| بيانات النشر: | Oxford University Press (OUP), 2003. |
| سنة النشر: | 2003 |
| مصطلحات موضوعية: | Physics, Jet (fluid), Accretion (meteorology), Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, Astronomy and Astrophysics, Quasar, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Loudness, Luminosity, Space and Planetary Science, QUIET, Radiative transfer |
| الوصف: | We present a new approach to tackle the issue of radio loudness in quasars. We constrain a (simple) prescription for the intrinsic distribution of radio-to-optical ratios by comparing properties of Monte Carlo simulated samples with those of observed optically selected quasars. We find strong evidence for a dependence of the radio luminosity on the optical one, even though with a large scatter. The dependence of the fraction of radio loud quasars on apparent and absolute optical magnitudes results in a selection effect related to the radio and optical limits of current surveys. The intrinsic distribution of the radio-to-optical ratios shows a peak at $R^*_{1.4} \sim 0.3$, with only $\simlt 5$ per cent of objects being included in a high $R^*_{1.4}$ tail which identifies the radio loud regime. No lack or deficit of sources -- but only a steep transition region -- is present between the radio loud and radio quiet populations at any $R^*_{1.4}$. We briefly discuss possible origins for this behaviour (e.g. absence of jets in radio quiet sources, large range of radiative radio efficiency, different life-times for the accretion and jet ejection phenomena, ...). |
| تدمد: | 0035-8711 |
| DOI: | 10.1046/j.1365-2966.2003.07105.x |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::8e1e14d9757e41e41b0b38ec5b267c14 https://doi.org/10.1046/j.1365-2966.2003.07105.x |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........8e1e14d9757e41e41b0b38ec5b267c14 |
| قاعدة البيانات: | OpenAIRE |
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