The Cosmic Radio and Infrared Backgrounds Connection | Zendy

E. Dwek | Zendy; M. K. Barker | Zendy

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The Cosmic Radio and Infrared Backgrounds Connection

Author(s) -

E. Dwek,

M. K. Barker

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/341143

Subject(s) - physics , astrophysics , cosmic cancer database , star formation , redshift , radio galaxy , cosmic infrared background , astronomy , galaxy , luminosity , luminous infrared galaxy , cosmic microwave background , anisotropy , quantum mechanics

We use the radio-infrared (IR) flux correlation bet ween star-forminggalaxies in the local universe to derive a simple analytical expression betweenthe intensity of the IR background and the brightness t emperature of the radiobackground. This relation i s insensitive to the star formation history of thegalaxies that produce the cosmic IR background (CIB). We use the observed CIBintensity to constrain t he cosmic star formation history, and the relationbetween the CIB and the cosmic radio background (CR B) to constrain therelative contribution of star-f orming galaxies to the CRB. Current limits onthe C IB intensity predict a 178 MHz brightness temperature of ~18+-9 K, abouthalf of the 37+-8 K inferred for an isotropic radio component. This suggeststhat s tar-forming galaxies and AGN contribute about equal ly to the CRBintensity at that frequency.Comment: Accepted for publication in the ApJ (14 pages + 3 embedded figures

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