Emission-Line Properties of MG2016+112: A Luminous Type-2 Quasar at High Redshift

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dc.creatorYamada, T.
dc.creatorYamazaki, S.
dc.creatorHattori, M.
dc.creatorSoucail, G.
dc.creatorKneib, J. -P.
dc.date1999-08-09
dc.date.accessioned2026-07-07T02:32:46Z
dc.date.available2026-07-07T02:32:46Z
dc.descriptionWe present new high signal-to-noise ratio spectra of the components B and C of the gravitational lensing system MG2016+112. We show that image C displays strong emission lines of Ly$α$, \NV, \CIV, \HeII, and \CIII redshifted to z=3.27, similar to images and B. We examine the emission-line flux ratios in order to put constraints on the lens models as well as to investigate the intrinsic nature of MG2016+112. The observed line ratios of B and C are consistent with those expected in the simple photo-ionization models for narrow-line region of active galactic nuclei (AGN) except for the enhanced \NV\ lines. The line ratios difference of components B and C can be interpreted as a difference in ionization parameters. This result is consistent with lens model prediction that C is a fold image of a slightly outer part of the nucleus. MG2016+112 is known to be very unique among the high-redshift AGN; it is neither an ordinary broad-line quasar nor a powerful radio galaxy as indicated by the width and flux ratio of the emission lines. Together with other observed properties discussed in literature, we argue that MG2016+112 is the highest redshift luminous radio-quiet type-2 quasar.
dc.description8 pages, submitted to Astronomy and Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/9908089
dc.identifierhttp://arxiv.org/abs/astro-ph/9908089
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/14581
dc.subjectAstrophysics
dc.titleEmission-Line Properties of MG2016+112: A Luminous Type-2 Quasar at High Redshift
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