Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...334..420b&link_type=abstract
Astronomy and Astrophysics, v.334, p.420-426 (1998)
Astronomy and Astrophysics
Astrophysics
10
Cosmic Microwave Background, Large-Scale-Structure Of Universe, Diffuse Radiation, Infrared: Galaxies
Scientific paper
We search for a cosmic component of the far-infrared and submillimetre background using the data from the COBE-FIRAS instrument. >From the correlation properties of the diffuse light maps obtained after all the foregrounds and discrete source contributions have been removed, we claim that the rms brightness is given by (nu I_nu )rms =~ 4 x (lambda /400mu m)(-3.1) nW m(-2) sr(-1) for lambda >= 400 mu m. At angular scales ranging from few degrees to few tens of degrees we find a steepening of the angular autocorrelation function with respect to the behaviour derived from galaxy surveys at smaller angular scales, becaming its spectral index gamma ~ 2, in agreement with the indications inferred from galaxy catalogues at similar scales. In addition it is found that the genus distributions of the diffuse light maps are consistent with a random gaussian field with a coherence angle ~ 5(deg.9) , in agreement with COBE-DMR. These evidences support the extragalactic origin of the detected residual far-infrared background.
Burigana Carlo
Popa Lucia
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