The Redshift Distribution of Infrared-Faint Radio Sources

Abstract

Infrared-Faint Radio Sources (IFRSs) are an important class of high-redshift active galaxy, and potentially important as a means of discovering more high-redshift radio sources, but only 25 IFRSs had redshifts prior to this paper. Here we increase the number of IFRSs with known spectroscopic redshifts by a factor of about 5 to 131, with redshifts up to z=4.387, and a median redshift of z = 2.68. The IFRS redshift distribution overlaps with the high-z radio galaxy (HzRG) redshift distribution but is significantly narrower, suggesting that the IFRSs are a subset of the larger class of HzRGs. We also confirm and measure the proposed correlation between redshift and 3.6 $\mu$m flux density, making it possible to use this correlation to find even higher redshift radio sources. Many more high-redshift sources are probably present in existing radio survey catalogues.

arXiv commentaccepted by mnras

References in corpus (44)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Unified Schemes for Radio-Loud Active Galactic Nuclei
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• SWIRE: The SIRTF Wide-area InfraRed Extragalactic Survey
• Extragalactic Science, Cosmology and Galactic Archaeology with the Subaru Prime Focus Spectrograph (PFS)
• The LOFAR Two-metre Sky Survey - I. Survey Description and Preliminary Data Release
• The Sloan Digital Sky Survey Quasar Catalog: twelfth data release
• EMU: Evolutionary Map of the Universe
• Distant Radio Galaxies and their Environments
• The DESI Experiment, a whitepaper for Snowmass 2013
• Rapid growth of high redshift black holes
• ALMA redshifts of millimeter-selected galaxies from the SPT survey: The redshift distribution of dusty star-forming galaxies
• The Massive Hosts of Radio Galaxies Across Cosmic Time
• The European Large Area ISO Survey I: Goals, Definition and Observation
• Near-infrared imaging and the K-z relation for radio galaxies in the 7C Redshift Survey
• Deep ATLAS radio observations of the CDFS-SWIRE field
• The Spitzer Extragalactic Representative Volume Survey (SERVS): survey definition and goals
• A Unified Catalog of Radio Objects Detected by NVSS, FIRST, WENSS, GB6, and SDSS
• HI 21cm absorption beyond the epoch of re-ionization
• Radio Continuum Surveys with Square Kilometre Array Pathfinders
• The MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) Survey
• Extragalactic Radio Continuum Surveys and the Transformation of Radio Astronomy
• Radio properties of Compact Steep Spectrum and GHz-Peaked Spectrum radio sources
• The near-to-mid infrared spectrum of quasars
• Infrared-Faint Radio Sources: A New Population of High-redshift Radio Galaxies
• The radio properties of infrared-faint radio sources
• Multiwavelength characterization of faint Ultra Steep Spectrum radio sources : A search for high-redshift radio galaxies
• Deep Spitzer observations of infrared-faint radio sources: high-redshift radio-loud AGN?
• VLBI detection of an Infrared-Faint Radio Source
• Deep 610-MHz Giant Metrewave Radio Telescope observations of the Spitzer extragalactic First Look Survey field - III. The radio properties of Infrared-Faint Radio Sources
• Evidence for Infrared-Faint Radio Sources as z > 1 Radio-Loud AGN
• Infrared-Faint Radio Sources: A Cosmological View - AGN Number Counts, the Cosmic X-Ray Background and SMBH Formation
• The first VLBI image of an Infrared-Faint Radio Source
• Simulating the 21cm forest detectable with LOFAR and SKA in the spectra of high-z GRBs
• Infrared-Faint Radio Sources are at high redshifts
• The WEAVE-LOFAR Survey
• An Updated Version of the Unified Radio Catalog: A Multi-Wavelength Radio and Optical Catalog of Quasars and Radio Galaxies
• The radio spectral energy distribution of infrared-faint radio sources
• On the nature of infrared-faint radio sources in the SXDF and VLA-VVDS fields
• Active galactic nuclei cores in infrared-faint radio sources: Very long baseline interferometry observations using the Very Long Baseline Array
• Infrared-Faint Radio Sources in the SERVS deep fields: Pinpointing AGNs at high redshift
• Infrared-faint radio sources remain undetected at far-infrared wavelengths. Deep photometric observations using the Herschel Space Observatory

Cited by in corpus (8)

• Compact steep-spectrum and peaked-spectrum radio sources
• The GLEAM 4-Jy (G4Jy) Sample: II. Host-galaxy identification for individual sources
• New constraints on the 1.4 GHz source number counts and luminosity functions in the Lockman Hole field
• The ATLAS 9.0 GHz Survey of the Extended Chandra Deep Field South: The Faint 9.0 GHz Radio Population
• The Apertif science verification campaign - Characteristics of polarised radio sources
• Radio Continuum Sources behind the Large Magellanic Cloud
• Multiwavelength Properties of Infrared-Faint Radio Sources Based on Spectral Energy Distribution Analysis
• The GLEAM 4-Jy (G4Jy) Sample: IV. Multiwavelength data and analysis