The XXL Survey. XLIII. The quasar radio loudness dichotomy exposed via radio luminosity functions obtained by combining results from COSMOS and XXL-S X-ray selected quasars
| Autor: | Sarah K. Leslie, J. Delhaize, Stefano Marchesi, Vernesa Smolčić, A. Butler, Jeyhan S. Kartaltepe, Manolis Plionis, Konstantinos Kolokythas, Eleni Vardoulaki, L. Ceraj, Marguerite Pierre, K. Tisanić, Mladen Novak, Cathy Horellou, Ivan Delvecchio, G. Zamorani |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
PRIRODNE ZNANOSTI. Fizika. Astronomija i astrofizika
Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Loudness Luminosity 0103 physical sciences NATURAL SCIENCES. Physics. Astronomy and Astrophysics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics evolution [galaxies] Luminosity function (astronomy) Physics general [quasars] 010308 nuclear & particles physics X-ray Astronomy and Astrophysics Quasar Astrophysics - Astrophysics of Galaxies Redshift Galaxy quasars: general galaxies: active galaxies: evolution galaxies: high-redshift Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) active [galaxies] high-redshift [galaxies] |
| Zdroj: | Astronomy and Astrophysics Volume 642 |
| ISSN: | 0004-6361 1432-0746 |
| DOI: | 10.1051/0004-6361/201936776 |
| Popis: | We studied a sample of 274 radio and X-ray selected quasars (XQSOs) detected in the COSMOS and XXL-S radio surveys at 3 GHz and 2.1 GHz, respectively. This sample was identified by adopting a conservative threshold in X-ray luminosity, Lx [2-10\ keV] >= 10^44 erg/s, selecting only the most powerful quasars. Using available multiwavelength data, we examined various criteria for the selection of radio-loud (RL) and radio-quiet (RQ) XQSOs, finding that the number of RL/RQ XQSOs changes significantly depending on the chosen criterion. This discrepancy arises due to the different criteria tracing different physical processes and due to our sample being selected from flux-limited radio and X-ray surveys. Another approach to study the origin of radio emission in XQSOs is via their radio luminosity function (RLF). We constructed the XQSO 1.4 GHz radio luminosity functions (RLFs) in six redshift bins at 0.5 14 pages, 11 figures |
| Databáze: | OpenAIRE |
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