Tentative detection of a cosmic far-infrared background with COBE.

Details Tentative detection of a cosmic far-infrared background with COBE. Tentative detection of a cosmic far-infrared background with COBE.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308l...5p&link_type=abstract

Astronomy and Astrophysics, v.308, p.L5

Astronomy and Astrophysics

Astrophysics

500

Cosmology: Observations, Diffuse Radiation, Galaxy: Formation

Scientific paper

We have searched for an extragalactic far infrared background in the whole sky survey of the Cosmic Background Explorer (COBE) Satellite, using data from the Far Infrared Absolute Spectrometer (FIRAS) instrument. We model and remove the interplanetary and interstellar dust components for all wavelengths above 140microns and below a few millimetres. The new Leiden/Dwingeloo HI survey is used for the interstellar cirrus component. A component associated with the HII medium is also removed. It is found that the residues of the subtraction method have a significant positive value at all wavelengths. This emission is isotropic and clearly shows an excess in the submillimeter over the HI associated dust emission spectrum that cannot be explained by known or suspected solar or galactic components. We therefore suggest that it could be the cosmic far infrared background due to early galaxies that has long been predicted. Its rather large intensity can be represented by νBnu_~3.4x10^-9^({lamdba}/400μm)^-3^W/(m^2^.sr) in the 400-1000μm range and levelling off at shorter wavelengths. It implies that a large fraction of the radiation of early galaxies has been converted in the far IR. The spectrum seems to indicate the presence of sources at large redshifts (typically z~3-10).

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