ar X iv : a st ro - p h / 01 07 20 5 v 1 1 1 Ju l 2 00 1 DRAFT printed March 16 , 2008 DIRBE Minus 2 MASS : the Cosmic Infrared
نویسنده
چکیده
Stellar fluxes from the 2MASS catalog are used to remove the contribution due to Galactic stars from the intensity measured by DIRBE in 13 regions in the North and South Galactic polar caps. Allowing for a constant calibration factor between the DIRBE 3.5 μm intensity and the 2MASS 2.2 μm fluxes gives very small pixel-pixel scatter. After subtracting the interplanetary and Galactic foregrounds, a residual intensity of 16.1 ± 4 kJy sr or 13.8 ± 3.4 nW m sr at 3.5 μm is found. A similar analysis at 2.2 μm gives a residual intensity of 17.6± 4.4 kJy sr or 24± 6 nW m sr. The intercepts of the DIRBE minus 2MASS correlation at 1.25 μm show more scatter and are a much smaller fraction of the foreground, leading to a weak limit on the CIRB of 10.1 ± 7.4 kJy sr or 24.3 ± 18 nW m sr (1 σ). Subject headings: cosmology: observations — diffuse radiation — infrared:general
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