The Apertif science verification campaign - Characteristics of polarised radio sources

Abstract

We analyse five early science datasets from the APERture Tile in Focus (Apertif) phased array feed system to verify the polarisation capabilities of Apertif in view of future larger data releases. We aim to characterise the source population of the polarised sky in the L-Band using polarised source information in combination with IR and optical data. We use automatic routines to generate full field-of-view Q- and U-cubes and perform RM-Synthesis, source finding, and cross-matching with published radio, optical, and IR data to generate polarised source catalogues. SED-fitting routines were used to determine photometric redshifts, star-formation rates, and galaxy masses. IR colour information was used to classify sources as AGN or star-forming-dominated and early- or late-type. We surveyed an area of 56deg${}^2$ and detected 1357 polarised source components in 1170 sources. The fraction of polarised sources is 10.57% with a median fractional polarisation of 4.70$\pm$0.14%. We confirmed the reliability of the Apertif measurements by comparing them with polarised cross-identified NVSS sources. Average RMs of the individual fields lie within the error of the best Milky Way foreground measurements. All of our polarised sources were found to be dominated by AGN activity in the radio regime with most of them being radio-loud (79%) and of the FRII class (87%). The host galaxies of our polarised source sample are dominated by intermediate disc and star-forming disc galaxies. The contribution of star formation to the radio emission is on the order of a few percent for $\approx$10% of the polarised sources while for $\approx$90% it is completely dominated by the AGN. We do not see any change in fractional polarisation for different star-formation rates of the AGN host galaxies.

arXiv comment24 pages, 21 figures

References in corpus (75)

• Stellar population synthesis at the resolution of 2003
• Accurate photometric redshifts for the CFHT Legacy Survey calibrated using the VIMOS VLT Deep Survey
• The Sixteenth Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra
• The Co-Evolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
• Measuring and Modelling the Redshift Evolution of Clustering: the Hubble Deep Field North
• Radio Properties of Infrared Selected Galaxies in the IRAS 2 Jy Sample
• The Infrared Spectral Energy Distribution of Normal Star-Forming Galaxies: Calibration at Far-Infrared and Submillimeter Wavelengths
• Mid-Infrared Selection of AGN with the Wide-Field Infrared Survey Explorer. I. Characterizing WISE-Selected AGN in COSMOS
• The 2MASS Redshift Survey - Description and Data Release
• Faraday Rotation Measure Synthesis
• The SDSS View of the Palomar-Green Bright Quasar Survey
• Determining Star Formation Rates for Infrared Galaxies
• Radio-Loudness of Active Galactic Nuclei: Observational Facts and Theoretical Implications
• Magnetic Fields in Spiral Galaxies
• The 1% Concordance Hubble Constant
• A 20cm VLA Survey of Abell Clusters of Galaxies VI. Radio/Optical Luminosity Functions
• A morphological algorithm for improving radio-frequency interference detection
• Using the Bright Ultra-Hard XMM-Newton Survey to define an IR selection of luminous AGN based on WISE colours
• Australian Square Kilometre Array Pathfinder: I. System Description
• An improved map of the Galactic Faraday sky
• Compact steep-spectrum and peaked-spectrum radio sources
• Revisiting the Fanaroff-Riley dichotomy and radio-galaxy morphology with the LOFAR Two-Metre Sky Survey (LoTSS)
• The LoTSS view of radio AGN in the local Universe. The most massive galaxies are always switched on
• GOODS-HERSCHEL: star formation, dust attenuation and the FIR-radio correlation on the Main Sequence of star-forming galaxies up to z~4
• The magnetic field of the Large Magellanic Cloud revealed through Faraday rotation
• Specific SFR profiles in nearby spiral galaxies: quantifying the inside-out formation of disks
• Deep ATLAS radio observations of the CDFS-SWIRE field
• Relativistic Jets in Active Galactic Nuclei und Microquasars
• Calibrating Star Formation in WISE using Total Infrared Luminosity
• The SAURON project - XV. Modes of star formation in early-type galaxies and the evolution of the red sequence
• Obscuration in extremely luminous quasars
• The Tiered Radio Extragalactic Continuum Simulation (T-RECS)
• The Origin and Evolution of Cosmic Magnetism
• The WISE Extended Source Catalogue (WXSC) I: The 100 Largest Galaxies
• The relation between morphology, accretion modes and environmental factors in local radio AGN
• Integral field spectroscopy of nearby QSOs: I. ENLR size-luminosity relation, ongoing star formation & resolved gas-phase metallicities
• Galaxy and Mass Assembly (GAMA): Exploring the WISE Cosmic Web in G12
• A Radio and Optical Polarization Study of the Magnetic Field in the Small Magellanic Cloud
• The interstellar and circumnuclear medium of active nuclei traced by HI 21-cm absorption
• Parsec-Scale Circular Polarization Observations of 40 Blazars
• Observations of magnetic fields in the Milky Way and in nearby galaxies with a Square Kilometre Array
• The Lockman Hole Project: new constraints on the sub-mJy source counts from a wide-area 1.4 GHz mosaic
• A Broadband Polarization Catalog of Extragalactic Radio Sources
• The duty cycle of radio galaxies revealed by LOFAR: remnant and restarted radio source populations in the Lockman Hole
• Accretion mode versus radio morphology in the LOFAR Deep Fields
• Radio Polarimetry of the ELAIS N1 Field: Polarized Compact Sources
• The Galactic Faraday depth sky revisited
• The Radio Properties of Type 2 Quasars
• The Australia Telescope Large Area Survey: Spectroscopic Catalogue and Radio Luminosity Functions
• Degree of Polarization and Source Counts of Faint Radio Sources from Stacking Polarized Intensity
• The Large Area Radio Galaxy Evolution Spectroscopic Survey (LARGESS): Survey design, data catalogue and GAMA/WiggleZ spectroscopy
• The distribution of polarized radio sources $>$15$\mu$Jy in GOODS-N
• ATLAS 1.4 GHz Data Release 2 -- I. Observations of the CDF-S and ELAIS-S1 fields and methods for constructing differential number counts
• ATLAS 1.4 GHz Data Release 2 -- II. Properties of the faint polarized sky
• The DRAO Planck Deep Fields: the polarization properties of radio galaxies at 1.4 GHz
• ATLBS: the Australia Telescope Low-brightness Survey
• Full-Stokes polarimetry with circularly polarized feeds - Sources with stable linear and circular polarization in the GHz regime
• Infrared-Faint Radio Sources: A New Population of High-redshift Radio Galaxies
• The radio properties of infrared-faint radio sources
• Deep Spitzer observations of infrared-faint radio sources: high-redshift radio-loud AGN?
• Taking snapshots of the jet-ISM interplay: The case of PKS0023-26
• Constraints on submicrojansky radio number counts based on evolving VLA-COSMOS luminosity functions
• Constraints on Feedback in the local Universe: The relation between star formation and AGN activity in early type galaxies
• The best of both worlds: Combining LOFAR and Apertif to derive resolved radio spectral index images
• M82 - A radio continuum and polarisation study II. Polarisation and rotation measures
• Infrared-Faint Radio Sources: A Cosmological View - AGN Number Counts, the Cosmic X-Ray Background and SMBH Formation
• A Radio Survey for Linear and Circular Polarization in Low Luminosity Active Galactic Nuclei
• The Magnetic Field and Polarization Properties of Radio Galaxies in Different Accretion States
• FR-type radio sources at 3 GHz VLA-COSMOS: Relation to physical properties and large-scale environment
• Radio Galaxy Zoo: Observational evidence for environment as the cause of radio source asymmetry
• Apercal -- The Apertif Calibration Pipeline
• The Redshift Distribution of Infrared-Faint Radio Sources
• Faint polarised sources in the Lockman Hole field at 1.4 GHz
• On the nature of infrared-faint radio sources in the SXDF and VLA-VVDS fields
• The Star Formation Rates of Elliptical Galaxies from Core-Collapse Supernovae

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• The Faraday Rotation Measure Grid of the LOFAR Two-metre Sky Survey: Data Release 2
• Magnetic field evolution in cosmic filaments with LOFAR data
• First release of Apertif imaging survey data
• On the nature of LOFAR RMs and new constraints on magnetic fields in cosmic filaments and on magnetogenesis scenarios
• The Apertif Radio Transient System (ARTS): Design, Commissioning, Data Release, and Detection of the first 5 Fast Radio Bursts
• The Huge Magnetic Toroids in the Milky Way Halo
• Characterising the Apertif primary beam response