Jet and Torus Orientations in High Redshift Radio Galaxies

Abstract

We examine the relative orientation of radio jets and dusty tori surrounding the AGN in powerful radio galaxies at z > 1. The radio core dominance R = P(20 GHz) /P(500 MHz) serves as an orientation indicator, measuring the ratio between the anisotropic Doppler-beamed core extended core emission and the isotropic lobe emission. Assuming a fixed cylindrical geometry for the hot, dusty torus, we derive its inclination i by fitting optically-thick radiative transfer models to spectral energy distributions obtained with the Spitzer Space Telescope. We find a highly significant anti-correlation (p < 0.0001) between R and i in our sample of 35 type 2 AGN combined with a sample of 18 z = 1 3CR sources containing both type 1 and 2 AGN. This analysis provides observational evidence both for the Unified scheme of AGN and for the common assumption that radio jets are in general perpendicular to the plane of the torus. The use of inclinations derived from mid-infrared photometry breaks several degeneracies which have been problematic in earlier analyses. We illustrate this by deriving the core Lorentz factor Gamma from the R-i anti-correlation, finding Gamma > 1.3.

18 pages, 12 figures, 6 tables

References in corpus (12)

• AGN Dusty Tori: I. Handling of Clumpy Media
• Evidence for powerful AGN winds at high redshift: Dynamics of galactic outflows in radio galaxies during the "Quasar Era"
• Radiative Transfer Modeling of Three-Dimensional Clumpy AGN Tori and its Application to NGC 1068
• The Massive Hosts of Radio Galaxies Across Cosmic Time
• The Infrared Nuclear Emission of Seyfert Galaxies on Parsec Scales: Testing the Clumpy Torus models
• Deep spectroscopy of the FUV-optical emission lines from a sample of radio galaxies at z~2.5: metallicity and ionization
• Rapid Coeval Black Hole and Host Galaxy Growth in MRC 1138-262: The Hungry Spider
• Near- and mid-infrared photometry of high-redshift 3CR sources
• Mid-Infrared Spectra of High Redshift (z>2) Radio Galaxies
• An extreme rotation measure in the high-redshift radio galaxy PKS B0529-549
• Constraining Torus Models for AGNs Using X-Ray Observations
• A sample of mJy radio sources at 1.4 GHz in the Lynx and Hercules fields - I. Radio imaging, multicolour photometry and spectroscopy

Cited by in corpus (31)

• Rapidly growing black holes and host galaxies in the distant Universe from the Herschel Radio Galaxy Evolution Project
• The Spitzer mid-infrared AGN survey. I - optical and near-infrared spectroscopy of candidate obscured and normal AGN selected in the mid-infrared
• $HST$ Grism Confirmation of $16$ Structures at $1.4<z<2.8$ from the Clusters Around Radio-Loud AGN (CARLA) Survey
• Are there reliable methods to estimate the nuclear orientation of Seyfert galaxies?
• The circumnuclear environment of NGC613: a nuclear starburst caught in the act?
• HST Grism Confirmation of Two $z\sim 2$ Structures from the Clusters Around Radio-Loud AGN (CARLA) Survey
• A robust derivation of the tight relationship of radio core dominance to inclination angle in high redshift 3CRR sources
• Ionized and hot molecular outflows in the inner 500 pc of NGC1275
• Neutral versus ionized gas kinematics at z~2.6: The AGN-host starburst galaxy PKS 0529-549
• Are we seeing accretion flows in a 250kpc-sized Ly-alpha halo at z=3?
• Disentangling star formation and AGN activity in powerful infrared luminous radio galaxies at 1<z<4
• The column density distribution of hard X-ray radio galaxies
• Quenching by gas compression and consumption: A case study of a massive radio galaxy at z = 2.57
• Molecular gas in type 2 quasars at z~0.2-0.3
• The relationship between the radio core-dominance parameter and spectral index in different classes of extragalactic radio sources (III)
• Kinematic signatures of AGN feedback in moderately powerful radio galaxies at z~2 observed with SINFONI
• Mapping the "invisible" circumgalactic medium around a z $\sim$ 4.5 radio galaxy with MUSE
• ALMA and MUSE observations reveal a quiescent multi-phase circumgalactic medium around the z~3.6 radio galaxy 4C 19.71
• Starbursts and dusty tori in distant 3CR radio galaxies
• An Infrared Excess Identified in Radio-Loud Broad Absorption Line Quasars
• Offsets between X-ray and Radio Components in X-ray Jets: The AtlasX
• 3D tomography of the giant Ly$\alpha$ nebulae of $z$$\approx$3--5 radio-loud AGN
• Circumnuclear Dust in AP Librae and the source of its VHE emission
• X-Ray-to-Radio Offset Inference from Low-Count X-Ray Jets
• The nature of massive black hole binary candidates: II. Spectral energy distribution atlas
• JWST + ALMA ubiquitously discover companion systems within $\lesssim 18$kpc around four $z$$\approx$3.5 luminous radio-loud AGN
• HerMES: Disentangling active galactic nuclei and star formation in the radio source population
• ALMA resolves the stellar birth explosion in distant quasar 3C298
• On The Depolarization Asymmetry Seen in Giant Radio Lobes
• The Nature and Likely Redshift of GLEAM J0917-0012
• Broadband nuclear emission in two radio-loud BAL quasars