The Cosmic Radio and Infrared Backgrounds Connection

Details The Cosmic Radio and Infrared Backgrounds Connection The Cosmic Radio and Infrared Backgrounds Connection

2002-03-26

arxiv.org/abs/astro-ph/0203472v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the ApJ (14 pages + 3 embedded figures)

Scientific paper

10.1086/341143

We use the radio-infrared (IR) flux correlation bet ween star-forming galaxies in the local universe to derive a simple analytical expression between the intensity of the IR background and the brightness t emperature of the radio background. This relation i s insensitive to the star formation history of the galaxies that produce the cosmic IR background (CIB). We use the observed CIB intensity to constrain t he cosmic star formation history, and the relation between the CIB and the cosmic radio background (CR B) to constrain the relative contribution of star-f orming galaxies to the CRB. Current limits on the C IB intensity predict a 178 MHz brightness temperature of ~18+-9 K, about half of the 37+-8 K inferred for an isotropic radio component. This suggests that s tar-forming galaxies and AGN contribute about equal ly to the CRB intensity at that frequency.

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