Fundamental differences in the radio properties of red and blue quasars: evolution strongly favoured over orientation

Abstract

A minority of the optically selected quasar population are red at optical wavelengths due to the presence of dust along the line-of-sight. A key focus of many red quasar studies is to understand their relationship with the overall quasar population: are they blue quasars observed at a (slight) inclination angle or do they represent a transitional phase in the evolution of quasars? Identifying fundamental differences between red and blue quasars is key to discriminate between these two paradigms. To robustly explore this, we have uniformly selected quasars from the Sloan Digital Sky Survey with mid-infrared counterparts, carefully controlling for luminosity and redshift effects. We take a novel approach to distinguish between colour-selected quasars in the redshift range of $0.2<z<2.4$ by constructing redshift-sensitive $g^{\ast }-i^{\ast }$ colour cuts. From cross-matching this sample to the Faint Images of the Radio Sky at Twenty-centimeters (FIRST) survey, we have found a factor $\approx$ 3 larger fraction of radio-detected red quasars with respect to that of blue quasars. Through a visual inspection of the FIRST images and an assessment of the radio luminosities (rest-frame $L_{1.4\mathrm{GHz}}$ and $L_{1.4\mathrm{GHz}}/L_{6\mu \mathrm{m}}$) we find that the radio-detection excess for red quasars is primarily due to compact and radio-faint systems (around the radio quiet--radio loud threshold). We show that our results rule out orientation as the origin for the differences between red and blue quasars and argue that they provide broad agreement with an evolutionary model.

Accepted to be published in MNRAS: 21 pages, 16 figures, and 6 tables

References in corpus (25)

• A Cosmological Framework for the Co-Evolution of Quasars, Supermassive Black Holes, and Elliptical Galaxies: I. Galaxy Mergers & Quasar Activity
• A Catalog of Quasar Properties from SDSS DR7
• Clustering of High Redshift ($z\ge 2.9$) Quasars from the Sloan Digital Sky Survey
• The Last of FIRST: The Final Catalog and Source Identifications
• Synchrotron Self-Compton Analysis of TeV X-ray Selected BL Lacertae Objects
• Evidence for Quasar Activity Triggered by Galaxy Mergers in HST Observations of Dust-reddened Quasars
• Signals from the Noise: Image Stacking for Quasars in the FIRST Survey
• Gamma-Ray Studies of Blazars: Synchro-Compton Analysis of Flat Spectrum Radio Quasars
• A Unified Catalog of Radio Objects Detected by NVSS, FIRST, WENSS, GB6, and SDSS
• Black-Hole Mass and Growth Rate at High Redshift
• The FIRST-2MASS Red Quasar Survey
• Radio Jets in Galaxies with Actively Accreting Black Holes: new insights from the SDSS
• Spitzer Observations of Young Red Quasars
• The Discovery of Gas-Rich, Dusty Starbursts in Luminous Reddened Quasars at $z\sim 2.5$ with ALMA
• Galaxy gas as obscurer: I. GRBs x-ray galaxies and find a N_H ~ M* relation
• Correlations of Quasar Optical Spectra with Radio Morphology
• Mean and Extreme Radio Properties of Quasars and the Origin of Radio Emission
• Are red 2MASS QSOs young?
• Relation between winds and jets in radio-loud AGN
• The nature of the intranight variability of radio-quiet quasars
• The B3-VLA CSS sample. VII: WSRT Polarisation Observations and the Ambient Faraday Medium Properties Revisited
• The Reddest DR3 SDSS/XMM Quasars
• Peering through the dust II: $XMM-Newton$ observations of two additional FIRST-2MASS red quasars
• Optical spectroscopic classification of a selection of Southern Hemisphere Fermi-LAT unclassified blazars
• Properties of spectrally-defined red QSOs at z = 0.3-1.2

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• Searching for Ultra-fast Outflows in AGN using Variability Spectra
• The multiwavelength properties of red QSOs -- Evidence for dusty winds as the origin of QSO reddening
• Fundamental differences in the radio properties of red and blue quasars: enhanced compact AGN emission in red quasars
• Fundamental differences in the radio properties of red and blue quasars: Insight from the LOFAR Two-metre Sky Survey (LoTSS)
• The Physical Properties of Low Redshift FeLoBAL Quasars. I. Spectral Synthesis Analysis of the BAL Outflows using $SimBAL$
• The WISE-2MASS Survey: Red Quasars Into the Radio Quiet Regime
• A panchromatic view of infrared quasars: excess star formation and radio emission in the most heavily obscured systems
• Red quasars blow out molecular gas from galaxies during the peak of cosmic star formation
• Fundamental differences in the properties of red and blue quasars: measuring the reddening and accretion properties with X-shooter
• LeMMINGs. III. The e-MERLIN Legacy Survey of the Palomar sample. Exploring the origin of nuclear radio emission in active and inactive galaxies through the [O III] -- radio connection
• Fundamental differences in the radio properties of red and blue quasars: kiloparsec-scale structures revealed by e-MERLIN
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• Evidence of extended cold molecular gas and dust halos around $\mathbf{z}\sim 2.3$ Extremely Red Quasars with ALMA
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• Spectacular 240 kpc double-sided relativistic jets in a spiral-hosted narrow-line Seyfert 1 galaxy
• Ubiquitous radio emission in quasars: predominant AGN origin and a connection to jets, dust and winds
• The LOFAR-eFEDS survey: The incidence of radio and X-ray AGN and the disk-jet connection
• Accretion properties of X-ray AGN: Evidence for radiation-regulated obscuration with redshift-dependent host galaxy contribution
• SUPER VIII. Fast and Furious at $z\sim 2$: obscured type-2 active nuclei host faster ionised winds than type-1 systems
• Powerful Radio-Loud Quasars are Triggered by Galaxy Mergers in the Cosmic Bright Ages
• A novel Bayesian approach for decomposing the radio emission of quasars: I. Modelling the radio excess in red quasars
• A Big Red Dot: Scattered light, host galaxy signatures and multi-phase gas flows in a luminous, heavily reddened quasar at cosmic noon
• Host Dark Matter Halos of SDSS Red and Blue Quasars: No Significant Difference in Large-scale Environment
• Do stellar-mass and super-massive black holes have similar dining habits?
• The Host Galaxies of Radio AGN: New Views from Combining LoTSS and MaNGA Observations
• How does the radio enhancement of broad absorption line quasars relate to colour and accretion rate?
• Kpc-scale Radio Structure in $z\sim 0.25$ Radio-Quiet QSOs
• First results from the JWST Early Release Science Program Q3D: Benchmark Comparison of Optical and Mid-IR Tracers of a Dusty, Ionized Red Quasar Wind at z=0.435
• Characterising SMSS J2157--3602, the most luminous known quasar, with accretion disc models
• VLA Snapshot Continuum Survey of FRI Quasar Candidates Selected from the LOFAR Two-Metre Sky Survey (LoTSS)
• How are Red and Blue Quasars Different? The Radio Properties
• Improved selection of extremely red quasars with boxy CIV lines in BOSS
• Radio-loudness statistics of quasars from Quaia-VLASS
• What is the origin of the stacked radio emission in radio-undetected quasars?: Insights from a radio-infrared image stacking analysis
• Probing the Wind Component of Radio Emission in Luminous High-Redshift Quasars
• Evidence for radio loud to radio quiet evolution from red and blue quasars
• Ionised AGN outflows in the Goldfish galaxy -- The illuminating and interacting red quasar eFEDSJ091157.4+014327 at z $\sim$ 0.6
• The viewing angle in AGN SED models, a data-driven analysis
• Exploring the quasar disc-wind-jet connection with LoTSS and SDSS
• A Spatially Resolved Evolutionary Sequence of Multi-wavelength AGN Host Galaxies