Sources of the Radio Background Considered

Abstract

We investigate different scenarios for the origin of the extragalactic radio background. The surface brightness of the background, as reported by the ARCADE 2 collaboration, is several times higher than that which would result from currently observed radio sources. We consider contributions to the background from diffuse synchrotron emission from clusters and the intergalactic medium, previously unrecognized flux from low surface brightness regions of radio sources, and faint point sources below the flux limit of existing surveys. By examining radio source counts available in the literature, we conclude that most of the radio background is produced by radio point sources that dominate at sub microJy fluxes. We show that a truly diffuse background produced by electrons far from galaxes is ruled out because such energetic electrons would overproduce the obserevd X-ray/gamma-ray background through inverse Compton scattering of the other photon fields. Unrecognized flux from low surface brightness regions of extended radio sources, or moderate flux sources missed entirely by radio source count surveys, cannot explain the bulk of the observed background, but may contribute as much as 10 per cent. We consider both radio supernovae and radio quiet quasars as candidate sources for the background, and show that both fail to produce it at the observed level because of insufficient number of objects and total flux, although radio quiet quasars contribute at the level of at least a few percent. We conclude that if the radio background is at the level reported, a majority of the total surface brightness would have to be produced by ordinary starforming galaxies above redshift 1 characterized by an evolving radio far-infrared correlation, which changes toward the radio loud with redshift.

12 pages, 3 figures, 1 table; MNRAS accepted and in press, (previously submitted ApJ but withdrawn before review)

References in corpus (34)

• Heating Hot Atmospheres with Active Galactic Nuclei
• An Observational Determination of the Bolometric Quasar Luminosity Function
• The synthesis of the cosmic X-ray background in the Chandra and XMM-Newton era
• Radio-Loudness of Active Galactic Nuclei: Observational Facts and Theoretical Implications
• The Cosmic Infrared Background Resolved by Spitzer. Contributions of Mid-Infrared Galaxies to the Far-Infrared Background
• The 0.4 < z < 1.3 star formation history of the Universe as viewed in the far-infrared
• Filamentary structures and compact objects in the Aquila and Polaris clouds observed by Herschel
• The far-infrared/radio correlation as probed by Herschel
• Signals from the Noise: Image Stacking for Quasars in the FIRST Survey
• Radio imaging of the Subaru/XMM-Newton Deep Field - I. The 100-microJy catalogue, optical identifications, and the nature of the faint radio source population
• Black-Hole Spin and Galactic Morphology
• BLAST: the far-infrared/radio correlation in distant galaxies
• The Deep SWIRE Field I. 20cm Continuum Radio Observations: A Crowded Sky
• MAGIC Gamma-ray Telescope Observation of the Perseus Cluster of Galaxies: implications for cosmic rays, dark matter, and NGC1275
• Exploring the infrared/radio correlation at high redshift
• A catalogue of micro-Jy radio sources in northern legacy fields
• The contribution of the Unresolved Extragalactic Radio Sources to the Brightness Temperature of the sky
• A multifrequency study of giant radio sources-II. Spectral ageing analysis of the lobes of selected sources
• The Radio/Optical Catalog of the SSA13 Field
• How many supernovae are we missing at high redshift?
• On the origin of radio core emission in radio-quiet quasars
• The ATESP 5 GHz radio survey I. Source counts and spectral index properties of the faint radio population
• Investigating the Far-IR/Radio Correlation of Star Forming Galaxies to z=3
• Multifrequency VLA observations of the FR I radio galaxy 3C 31: morphology, spectrum and magnetic field
• A multifrequency study of giant radio sources I. Low-frequency Giant Metrewave Radio Telescope observations of selected sources
• ATLBS: the Australia Telescope Low-brightness Survey
• An evolution of the IR-Radio correlation at very low flux densities?
• The FIR-Radio Relationship at High and Low Redshift
• The new sample of giant radio sources II. Update of optical counterparts, further spectroscopy of identified faint host galaxies, high-frequency radio maps, and polarisation properties of the sources
• A sample of mJy radio sources at 1.4 GHz in the Lynx and Hercules fields - II. Cosmic evolution of the space density of FRI radio sources
• Cascade and Damping of Alfvén-Cyclotron Fluctuations: Application to Solar Wind Turbulence Spectrum
• Relics of Double Radio Sources
• Interpretation of the Extragalactic Radio Background
• A deep survey of the low-surface-brightness radio sky

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