Kpc-scale Radio Structure in $z\sim 0.25$ Radio-Quiet QSOs

Abstract

We present analysis of a homogeneous, optically selected, volume-limited ($0.2<z<0.3$) sample of 128 radio-quiet quasi-stellar objects (QSOs) recently observed at 6 GHz with the Very Large Array (VLA) in A-configuration ($\sim 0.33^{\prime \prime }$ resolution). We compare these new results to earlier (2010--2011) 6-GHz observations with the VLA in C-configuration ($\sim 3.5^{\prime \prime }$). While all of these radio-quiet QSOs (RQQs) were unresolved on a $3.5^{\prime \prime }$ scale ($\sim$14 kpc at $z=0.25$), we resolve notable complex sub-galactic structures in about half of the RQQs at $0.33^{\prime \prime }$ resolution ($\sim$1.3 kpc at $z=0.25$). By comparison of flux density measurements between the two sets of observations, we demonstrate that significant sub-galactic-scale radio structure is present in at least 70% of the RQQ population, and that the central component accounts for an average of $\approx$65% of the total detected radio power. One RQQ, J0935+4819, shows striking symmetric, double-lobed morphology, and appears to be the first identified example of a radio-$\text{quiet}$ QSO with FR II type morphology on $\sim$arcsec scale (projected size of $\gtrsim 6$ kpc). In addition to revealing RQQ sub-galactic morphology, we employ counterparts from legacy (FIRST at 1.4 GHz) and recent (VLA Sky Survey at 3 GHz) VLA surveys to investigate radio spectral indices and potential variability over decades-long timescales for a subset of the RQQs, and for the cores of radio-intermediate and -loud sources in the parent sample of 178 QSOs. These results support the growing notion that the RQQ population is not a monolithic phenomenon, but instead consists of a mixture of mainly starburst-powered and jet-powered galaxies.

arXiv comment44 pages, 16 figures, accepted for publication in AJ

References in corpus (60)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Astropy: A Community Python Package for Astronomy
• The Seventh Data Release of the Sloan Digital Sky Survey
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• LOFAR: The LOw-Frequency ARray
• A Cosmology Calculator for the World Wide Web
• Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Quasar Sample
• The Sloan Digital Sky Survey Quasar Catalog V. Seventh Data Release
• Relativistic Jets in Active Galactic Nuclei
• The LOFAR Two-metre Sky Survey - II. First data release
• A multi-scale multi-frequency deconvolution algorithm for synthesis imaging in radio interferometry
• The Expanded Very Large Array -- a New Telescope for New Science
• The LOFAR Two-metre Sky Survey -- V. Second data release
• The VLA-COSMOS 3 GHz Large Project: Continuum data and source catalog release
• An Accurate Flux Density Scale from 50 MHz to 50 GHz
• Chandra Snapshot Observations of Low-Luminosity AGNs with a Compact Radio Source
• Quasar feedback and the origin of radio emission in radio-quiet quasars
• The Last of FIRST: The Final Catalog and Source Identifications
• An Infrared Survey of Brightest Cluster Galaxies. II: Why are Some Brightest Cluster Galaxies Forming Stars?
• Compact steep-spectrum and peaked-spectrum radio sources
• The Dynamic Evolution of Young Extragalactic Radio Sources
• Photometric redshifts for the SDSS Data Release 12
• A Unified Catalog of Radio Objects Detected by NVSS, FIRST, WENSS, GB6, and SDSS
• A pilot study of the radio-emitting AGN population: the emerging new class of FR0 radio-galaxies
• VLBI Images of 49 Radio Supernovae in Arp 220
• Radio Loud and Radio Quiet Quasars
• The VLA Survey of the Chandra Deep Field South. V. Evolution and Luminosity Functions of sub-mJy radio sources and the issue of radio emission in radio-quiet AGN
• VLBA Imaging of Central Engines in Radio Quiet Quasars
• AGN and Starburst Radio Emission from Optically Selected QSOs
• Radio Variability of Radio Quiet and Radio Loud Quasars
• Star formation in quasar hosts and the origin of radio emission in radio-quiet quasars
• Radio faint AGN: a tale of two populations
• The optically-powerful quasar E1821+643 is associated with a 300-kpc scale FRI radio structure
• Statistical analyses of long-term variability of AGN at high radio frequencies
• The Two-Component Radio Luminosity Function of QSOs: Star Formation and AGN
• FR0CAT: a FIRST catalog of FR0 radio galaxies
• Starburst in the Ultra-luminous Galaxy Arp 220 - Constraints from Observations of Radio Recombination Lines and Continuum
• High-resolution VLA Imaging of SDSS Stripe 82 at 1.4 GHz
• Quasars That Have Transitioned from Radio-quiet to Radio-loud on Decadal Timescales Revealed by VLASS and FIRST
• High-Resolution Radio Continuum Measurements of the Nuclear Disks of Arp 220
• Sub-arcsecond imaging with the International LOFAR Telescope I. Foundational calibration strategy and pipeline
• Disclosing the Radio Loudness Distribution Dichotomy in Quasars: An Unbiased Monte Carlo Approach Applied to the SDSS-FIRST Quasar Sample
• Fundamental differences in the radio properties of red and blue quasars: evolution strongly favoured over orientation
• Variable and Transient Radio Sources in the FIRST Survey
• AGN Coronal Emission models I. The Predicted Radio Emission
• The radio loudness of SDSS quasars from the LOFAR Two-metre Sky Survey: ubiquitous jet activity and constraints on star formation
• The faint radio sky: VLBA observations of the COSMOS field
• Correlations of Quasar Optical Spectra with Radio Morphology
• Unveiling the origin of the radio emission in radio-quiet quasars
• Deep sub-arcsecond widefield imaging of the Lockman Hole field at 144 MHz
• Deep, wide-field, global VLBI observations of the Hubble Deep Field North and Flanking Fields
• Compact radio cores in radio-quiet AGNs
• GPS/CSS radio sources and their relation to other AGN
• Multifrequency study of GHz-peaked spectrum sources
• Observations contradict galaxy size and surface brightness predictions that are based on the expanding universe hypothesis
• Fundamental differences in the radio properties of red and blue quasars: kiloparsec-scale structures revealed by e-MERLIN
• Caltech-NRAO Stripe 82 Survey (CNSS). IV. The Birth of Radio-loud Quasar 013815+00
• Direction Dependent Corrections in Polarimetric Radio Imaging II: A-Solver Methodology A low-order solver for the A-Term of the A-Projection algorithm

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