Giant radio quasars: sample and basic properties

Abstract

We present the largest sample of giant radio quasars (GRQs), which are defined as having a projected linear size greater than 0.7 Mpc. The sample consists of 272 GRQs, of which 174 are new objects discovered through cross-matching the NRAO VLA Sky Survey (NVSS) and the Sloan Digital Sky Survey 14${}^{\mathrm{th}}$ Data Release Quasar Catalogue (DR14Q) and confirmed using Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) radio maps. In our analysis we compare the GRQs with 367 smaller, lobe-dominated radio quasars found using our search method, as well as with quasars from the SDSS DR14 Quasar Catalogue, investigating the parameters characterizing their radio emission (i.e. total and core radio luminosity, radio core prominence), optical properties (black hole masses, accretion rates, distribution in Eigenvector 1 plane) and infrared colours. For the GRQs and smaller radio quasars we find a strong correlation between [OIII] luminosity and radio luminosity at 1.4 GHz, indicating a strong connection between radio emission and conditions in the narrow-line region. We spot no significant differences between GRQs and smaller radio quasars, however we show that most extended radio quasars belong to a quasar population of evolved AGNs with large black hole masses and low accretion rates. We also show that GRQs have bluer W2-W3 colours compared to SDSS quasars with FIRST detections, indicating differences in the structure of the dusty torus.

30 pages, 14 figures, accepted for publication in ApJSS

References in corpus (12)

• The LOFAR Two-metre Sky Survey - I. Survey Description and Preliminary Data Release
• The unWISE Catalog: Two Billion Infrared Sources from Five Years of WISE Imaging
• New Insights on the QSO Radio-Loud/Radio-Quiet Dichotomy: SDSS Spectra in the Context of the 4D Eigenvector1 Parameter Space
• Fundamental differences in the radio properties of red and blue quasars: evolution strongly favoured over orientation
• A multifrequency study of giant radio sources-II. Spectral ageing analysis of the lobes of selected sources
• On the relationship between a giant radio galaxy MSH 05-22 and the ambient large-scale galaxy structure
• What does Civλ1549 tell us about the physical driver of the Eigenvector Quasar Sequence?
• Optical and radio properties of extragalactic radio sources with recurrent jet activity
• Correlations of Quasar Optical Spectra with Radio Morphology
• A multifrequency study of giant radio sources I. Low-frequency Giant Metrewave Radio Telescope observations of selected sources
• A multifrequency study of giant radio sources III. Dynamical age vs. spectral age of the lobes of selected sources
• What sparks the radio-loud phase of nearby quasars?