D. J. Fixsen et al. 1998 ApJ 508 123 doi:10.1086/306383
D. J. Fixsen1, E. Dwek2, J. C. Mather2, C. L. Bennett2 and R. A. Shafer2
Show affiliationsThe COBE FIRAS data contain foreground emission from interplanetary, Galactic interstellar dust and extragalactic background emission. We use three different methods to separate the various emission components, and derive the spectrum of the extragalactic far-infrared background (FIRB). Each method relies on a different set of assumptions, which affect the FIRB spectrum in different ways. Despite this, the FIRB spectra derived by these different methods are remarkably similar. The average spectrum that we derive in the ν = 5-80 cm-1 (2000-125 μm) frequency interval is I(ν) = (1.3 ± 0.4) × 10-5(ν/ν0)0.64±0.12Pν(18.5 ± 1.2 K), where ν0 = 100 cm-1 (λ0 = 100 μm), and P is the Planck function. The derived FIRB spectrum is consistent with the (DIRBE) 140 and 240 μm detections. The total intensity received in the 5-80 cm-1 frequency interval is 14 nW m-2 sr-1 and comprises about 20% of the total intensity expected from the energy release from nucleosynthesis throughout the history of the universe.
cosmology: observations; diffuse radiation; infrared: general; interplanetary medium
Issue 1 (1998 November 20)
Received 1998 January 9, accepted for publication 1998 June 22
D. J. Fixsen et al. 1998 ApJ 508 123
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