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Título: | 3C 57 as an atypical radio-loud quasar: Implications for the radio-loud/radio-quiet dichotomy |
Autor: | Sulentic, Jack W. CSIC; Martínez Carballo, M. A. CSIC ORCID; Marziani, Paola CSIC ORCID; Olmo, Ascensión del CSIC ORCID; Stirpe, G.M.; Zamfir, S.; Plauchu-Frayn, I. | Palabras clave: | Quasars: general Quasars: individual: 3C 57 Quasars: emission lines Line: profiles |
Fecha de publicación: | 2015 | Editor: | Oxford University Press | Citación: | Monthly Notices of the Royal Astronomical Society 450: 1916- 1925 (2015) | Resumen: | © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Lobe-dominated radio-loud (LD RL) quasars occupy a restricted domain in the 4D Eigenvector 1 (4DE1) parameter space which implies restricted geometry/physics/kinematics for this subclass compared to the radio-quiet (RQ) majority of quasars. We discuss how this restricted domain for the LD RL parent population supports the notion for a RQ-RL dichotomy among type 1 sources. 3C 57 is an atypical RL quasar that shows both uncertain radio morphology and falls in a region of 4DE1 space where RL quasars are rare. We present new radio flux and optical spectroscopic measures designed to verify its atypical optical/UV spectroscopic behaviour and clarify its radio structure. The former data confirms that 3C 57 falls off the 4DE1 quasar 'main sequence' with both extreme optical Fe II emission (RFe II ~ 1) and a large CIV λ1549 profile blueshift (~-1500 km s<sup>-1</sup>). These parameter values are typical of extreme Population A sources which are almost always RQ. New radio measures show no evidence for flux change over a 50+year time-scale consistent with compact steep-spectrum (or young LD) over core-dominated morphology. In the 4DE1 context where LD RL are usually low L/L<inf>Edd</inf> quasars, we suggest that 3C 57 is an evolved RL quasar (i.e. large blackhole mass) undergoing a major accretion event leading to a rejuvenation reflected by strong Fe II emission, perhaps indicating significant heavy metal enrichment, high bolometric luminosity for a low-redshift source and resultant unusually high Eddington ratio giving rise to the atypical CIV λ1549. | URI: | http://hdl.handle.net/10261/134094 | DOI: | 10.1093/mnras/stv710 | Identificadores: | doi: 10.1093/mnras/stv710 issn: 1365-2966 |
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