2019
DOI: 10.1051/0004-6361/201833892
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LoTSS/HETDEX: Optical quasars

Abstract: The radio-loud/radio-quiet (RL/RQ) dichotomy in quasars is still an open question. Although it is thought that accretion onto supermassive black holes in the centre the host galaxies of quasars is responsible for some radio continuum emission, there is still a debate as to whether star formation or active galactic nuclei (AGN) activity dominate the radio continuum luminosity. To date, radio emission in quasars has been investigated almost exclusively using high-frequency observations in which the Doppler boost… Show more

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Cited by 64 publications
(74 citation statements)
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“…The canonical FRI/II luminosity break is around L 150 ∼ 10 26 W Hz −1 (Fanaroff & Riley 1974;Ledlow & Owen 1996). In our sample a significant minority of FRIs lie above this luminosity (194 sources, or Gürkan et al 2019). Roughly 45 per cent of the luminous FRIs in our sample are indeed quasars with z > 0.8.…”
Section: Fri and Frii Radio Properties In Lotssmentioning
confidence: 60%
“…The canonical FRI/II luminosity break is around L 150 ∼ 10 26 W Hz −1 (Fanaroff & Riley 1974;Ledlow & Owen 1996). In our sample a significant minority of FRIs lie above this luminosity (194 sources, or Gürkan et al 2019). Roughly 45 per cent of the luminous FRIs in our sample are indeed quasars with z > 0.8.…”
Section: Fri and Frii Radio Properties In Lotssmentioning
confidence: 60%
“…Another study using a sample with S 1.4GHz ≥ 11.5 µJy applied spectral energy distribution fitting and led to similar conclusions: the peak of the radio LF is at z ∼ 2 (Ceraj et al 2018). The radio loudness dichotomy was addressed also at low radio frequencies (120 − 168 MHz, Gürkan et al 2019), concluding that low-power quasars are dominated by star formation.…”
Section: Introductionmentioning
confidence: 99%
“…Although the time evolution of some radio loud quasars may lead to radio quiet quasars, these constitute a minority among the overall AGN phenomenon in the model and therefore the radio loud/radio quiet dichotomy can be understood without appealing to time evolution (see Garofalo et al 2016, and Garofalo, Christian & Jones 2019, for time evolution as connected to the time dependent merger function). The fact that radio loudness is not a dichotomy but a continuous phenomenon (Gurkan et al 2019) can also be understood in terms of a range in black hole spin values spanning the full retrograde/prograde regime. A prediction of all this is that as observations explore narrower high mass ranges of halo and black hole mass, the clustering preference of RLQ versus RQQ should decrease.…”
Section: Discussionmentioning
confidence: 99%