What sparks the radio-loud phase of nearby quasars?

Abstract

To better constrain the hypotheses proposed to explain why only a few quasars are radio loud (RL), we compare the characteristics of 1958 nearby $(z\le 0.3)$ SDSS quasars, covered by the FIRST and NVSS radio surveys. Only 22\% are RL with $\log (L_{1.4\mathrm{GHz}})\ge 22.5$ W Hz${}^{-1}$, the majority being compact (C), weak radio sources (WRS), with $\log (L_{1.4\mathrm{GHz}})<24.5$ W Hz${}^{-1}$. 15\% of the RL quasars have extended radio morphologies: 3\% have a core and a jet (J), 2\% have a core with one lobe (L), and 10\% have a core with two lobes (T), the majority being powerful radio sources (PRS), with $\log (L_{1.4\mathrm{GHz}})\ge 24.5$ W Hz${}^{-1}$. In general, RL quasars have higher bolometric luminosities and ionisation powers than radio quiet (RQ) quasars. The WRS have comparable black hole (BH) masses as the RQ quasars, but higher accretion rates or radiative efficiencies. The PRS have higher BH masses than the WRS, but comparable accretion rates or radiative efficiencies. The WRS also have higher $FWH{M}_{[\mathrm{OIII}]}$ than the PRS, consistent with a coupling of the spectral characteristics of the quasars with their radio morphologies. Inspecting the SDSS images and applying a neighbour search algorithm reveal no difference between the RQ and RL quasars of their host galaxies, environments, and interaction. Our results prompt the conjecture that the phenomenon that sparks the radio-loud phase in quasars is transient, intrinsic to the AGN, and stochastic, due to the chaotic nature of the accretion process of matter onto the BHs.

To be published in Monthly Notices of the Royal Astronomical Society, 25 pages with 16 figures

References in corpus (19)

• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Co-Evolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
• Radio-Loudness of Active Galactic Nuclei: Observational Facts and Theoretical Implications
• On the prevalence of radio-loud AGN in brightest cluster galaxies: implications for AGN heating of cooling flows
• The Radio-Loud Fraction of Quasars is a Strong Function of Redshift and Optical Luminosity
• Radio Loud and Radio Quiet Quasars
• The VLA-COSMOS Survey: III. Further Catalog Analysis and the Radio Source Counts
• The accretion mechanism in low-power radio galaxies
• Radio Jets in Galaxies with Actively Accreting Black Holes: new insights from the SDSS
• Radio Sources in Galaxy Clusters: Radial Distribution, and 1.4 GHz and K-band Bivariate Luminosity Function
• The dynamical state of brightest cluster galaxies and the formation of clusters
• New Insights on the QSO Radio-Loud/Radio-Quiet Dichotomy: SDSS Spectra in the Context of the 4D Eigenvector1 Parameter Space
• The host galaxy/AGN connection in nearby early-type galaxies. A new view of the origin of the radio-quiet/radio-loud dichotomy?
• A catalogue of photometric redshifts for the SDSS-DR9 galaxies
• Correlations of Quasar Optical Spectra with Radio Morphology
• Radio Properties of Low Redshift Broad Line Active Galactic Nuclei
• The Deep Diffuse Extragalactic Radio Sky at 1.75 GHz
• Radio AGN in 13,240 galaxy clusters from the Sloan Digital Sky Survey
• Comparing narrow and broad-line AGNs, in a new diagnostic diagram for emission-line galaxies based on WISE data

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• Ejective and preventative: the IllustrisTNG black hole feedback and its effects on the thermodynamics of the gas within and around galaxies
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• Evidence for higher black hole spin in radio-loud quasars
• Caltech-NRAO Stripe 82 Survey (CNSS). IV. The Birth of Radio-loud Quasar 013815+00
• The optically-selected 1.4-GHz quasar luminosity function below 1 mJy
• Disentangling the AGN and Star-Formation Contributions to the Radio-X-ray Emission of Radio-Loud Quasars at 1<z<2
• The ubiquity of AGN winds in Seyfert 1 galaxies at low redshift
• The optical luminosity function of LOFAR radio-selected quasars at $1.4\le z\le 5.0$ in the NDWFS-Boötes field
• Exploring the links between quasar winds and radio emission along the Main Sequence at high redshift
• Probing the rapid formation of black holes and their galaxy hosts in QSOs
• Environment of SDSS quasars at $z=0.4$$-$$1.0$ explored by Subaru HSC
• No dependence of radio properties of brightest group galaxies on the luminosity gap
• New Giant Radio Galaxies in the SDSS-JVLA Stripe82 and LoTSS-PDR Survey
• Discovery of 178 Giant Radio Galaxies in 1059 deg${}^2$ of the Rapid ASKAP Continuum Survey at 888 MHz
• What we talk about when we talk about blazars?