Multiwavelength Properties of Infrared-Faint Radio Sources Based on Spectral Energy Distribution Analysis

Abstract

Infrared-faint radio sources (IFRSs) are believed to be a rare class of radio-loud active galactic nuclei (RL AGN) characterized by their high radio-to-infrared flux density ratios of up to several thousands. Previous studies have shown that a fraction of IFRSs are likely to be hosted in dust-obscured galaxies (DOGs). In this paper, our aim was to probe the dust properties, star formation rate (SFR), and AGN activity of IFRSs by modeling the UV-to-infrared spectral energy distribution (SED) of 20 IFRSs with spectroscopic redshifts ranging from 1.2 to 3.7. We compare the Bayesian evidence of a three-component model (stellar, AGN and cold dust) with that of a two-component model (stellar and cold dust) for six IFRSs in our sample with far-infrared (FIR) photometry and find that the three-component model has significantly higher Bayesian evidence, suggesting that IFRSs are most likely to be AGN. The median SED of our IFRS sample shows similarities to AGN-starburst composite in the IR regime. The derived IR luminosities of IFRSs indicate that they are low-luminosity counterparts of high-redshift radio galaxies. We disentangle the contributions of AGN-heated and star-formation-heated dust to the IR luminosity of IFRSs and find that our sample is likely AGN-dominated. However, despite the evidence for significant impact of AGN on the host galaxy, the AGN luminosity of our sample does not show correlation with the SFR of the sources.

arXiv comment27 pages, 11 figures, 5 tables. Accepted for publication in ApJ

References in corpus (51)

• Stellar population synthesis at the resolution of 2003
• Galactic Stellar and Substellar Initial Mass Function
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Star Formation in Galaxies Along the Hubble Sequence
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey
• Bayes in the sky: Bayesian inference and model selection in cosmology
• Spectral Energy Distributions of Hard X-ray selected AGNs in the XMDS Survey
• AGN Dusty Tori: II. Observational Implications of Clumpiness
• The Herschel Multi-tiered Extragalactic Survey: HerMES
• AGN Dusty Tori: I. Handling of Clumpy Media
• Black hole variability and the star formation-AGN connection: Do all star-forming galaxies host an AGN?
• The VISTA Deep Extragalactic Observations (VIDEO) Survey
• The Early Data Release of the Dark Energy Spectroscopic Instrument
• An ALMA Survey of Submillimetre Galaxies in the Extended Chandra Deep Field South: The Far-Infrared Properties of SMGs
• The Far- and Mid-Infrared/Radio Correlations in the Spitzer Extragalactic First Look Survey
• The Multiwavelength Survey by Yale-Chile (MUSYC): Deep Medium-Band optical imaging and high quality 32-band photometric redshifts in the ECDF-S
• The Massive Hosts of Radio Galaxies Across Cosmic Time
• The LABOCA survey of the Extended Chandra Deep Field South: A photometric redshift survey of submillimetre galaxies
• Deep ATLAS radio observations of the CDFS-SWIRE field
• A Unified Catalog of Radio Objects Detected by NVSS, FIRST, WENSS, GB6, and SDSS
• The Spitzer High Redshift Radio Galaxy Survey
• The Herschel Multi-Tiered Extragalactic Survey: SPIRE-mm Photometric Redshifts
• VLBI Imaging of Luminous Infrared Galaxies: AGN Cores in Mrk231, UGC 5101 & NGC 7469
• Rapidly growing black holes and host galaxies in the distant Universe from the Herschel Radio Galaxy Evolution Project
• Harold Jeffreys's Theory of Probability Revisited
• Herschel reveals a T_dust-unbiased selection of z~2 ULIRGs
• The Spectral Energy Distributions and Infrared Luminosities of z \approx 2 Dust Obscured Galaxies from Herschel and Spitzer
• Infrared spectral energy distribution decomposition of WISE-selected, hyperluminous hot dust-obscured galaxies
• BayeSED: A General Approach to Fitting the Spectral Energy Distribution of Galaxies
• An unbiased sample of bright southern Compact Steep Spectrum and Gigahertz Peaked Spectrum Sources
• Infrared-Faint Radio Sources: A New Population of High-redshift Radio Galaxies
• The radio properties of infrared-faint radio sources
• A Comprehensive Bayesian Discrimination of the Simple Stellar Population Model, Star Formation History and Dust Attenuation Law in the Spectral Energy Distribution Modeling of Galaxies
• Deep Spitzer observations of infrared-faint radio sources: high-redshift radio-loud AGN?
• Co-evolution of Extreme Star Formation and Quasar: hints from {\it Herschel} and the Sloan Digital Sky Survey
• 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
• Infrared-Faint Radio Sources are at high redshifts
• Physical properties of hyperluminous, dust-obscured quasars at $z\sim 3$: multiwavelength Spectral Energy Distribution analysis and cold gas content revealed by ALMA
• The radio spectral energy distribution of infrared-faint radio sources
• The Redshift Distribution of Infrared-Faint Radio Sources
• Active galactic nuclei cores in infrared-faint radio sources: Very long baseline interferometry observations using the Very Long Baseline Array
• On the nature of infrared-faint radio sources in the SXDF and VLA-VVDS fields
• Infrared-faint radio sources remain undetected at far-infrared wavelengths. Deep photometric observations using the Herschel Space Observatory