gravitational lensing: strong; techniques: interferometric; galaxies: evolution; galaxies: jets; quasars: general; dark matter; Astrophysics - Astrophysics of Galaxies; Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract :
[en] We present e-MERLIN and European VLBI Network observations which reveal unambiguous jet activity within radio-quiet quasar HS 0810+2554. With an intrinsic flux density of 880 nJy, this is the faintest radio source ever imaged. The findings present new evidence against the idea that radio-loud and radio-quiet quasars are powered by different underlying radio emission mechanisms, showing instead that the same active galactic nucleus (AGN) mechanism can operate as the dominant source of radio emission even in the very lowest radio luminosity quasars. Due to strong gravitational lensing, our source is not only visible, but with VLBI is imaged to a scale of just 0.27 pc: the highest ever resolution image of a radio-quiet quasar. Brightness temperatures of at least 8.4 × 10[SUP]6[/SUP] K are associated with two highly compact components. Subsequent modelling of the lensed system has revealed that the components are linearly aligned on opposing sides of the optical quasar core, with the typical morphology of a compact symmetric object (CSO). Given that this source has been found to fall on the radio-FIR correlation, we suggest that the radio-FIR correlation cannot always be used to rule out AGN activity in favour of star formation activity. The correlation - or at least its scatter - may conceal the coexistence of kinetic and radiative feedback modes in AGN. Modelling of the lensing mass itself points to a non-smooth mass distribution, hinting at the presence of dark matter substructure which has manifested as astrometric perturbations of the VLBI lensed images.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hartley, P.; Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK
Jackson, N.; Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, UK
Sluse, Dominique ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Stacey, H. R.; ASTRON, Netherlands Institute for Radio Astronomy, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, the Netherlands ; Kapteyn Astronomical Institute, PO Box 800, NL-9700 AV Groningen, the Netherlands
Vives-Arias, H.; Instituto de Astrofísica de Canarias, Vía Láctea, s/n, E-38205 La Laguna, Tenerife, Spain ; Departmento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain)
Language :
English
Title :
Strong lensing reveals jets in a sub-microJy radio-quiet quasar
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