Cosmic Background Explorer DIRBE Annual\ Average\ Map

Please contact us if you want access to these data. <P> Detailed descriptions of the DIRBE, the data processing, and the data products are given in an Explanatory Supplement. A Small Source Spectral Energy Distribution Browser can be used to assess the visibility of an unresolved or small extended source in the DIRBE data and see its spectral energy distribution. As noted in section 5.6.6 of the Explanatory Supplement, the DIRBE Time-ordered Data are required to derive definitive point source fluxes. <p> These maps provide an estimate of the infrared intensity at each pixel and wavelength band based on an interpolation of the observations made at various times at solar elongations close to 90&amp;#176;;. <P> These COBE DIRBE maps are a combination original ten band passes with the following wavelengths: <UL> <LI>Band 1 - 1.25 &amp;#181;;m <LI>Band 2 - 2.2 &amp;#181;;m <LI>Band 3 - 3.5 &amp;#181;;m <LI>Band 4 - 4.9 &amp;#181;;m <LI>Band 5 - 12 &amp;#181;;m <LI>Band 6 - 25 &amp;#181;;m <li>Band 7 - 60 &amp;#181;;m <li>Band 8 - 100 &amp;#181;;m <li>Band 9 - 140 &amp;#181;;m <li>Band 10 - 240 &amp;#181;;m </ul> <p> The default two dimensional array uses Band 8 (100 &amp;#181;;m). <P> The COBE DIRBE/Annual Average Maps (AAM) is the cumulative weighted average of the photometry.

This average is calculated using the weighted number of observations from each Weekly Averaged Map ( WtNumObs from the Weekly Averaged Map) as the weight, such that annual_average =sum( weekly_average

• weekly_weight )/ sum( weekly_weight ) <p> COBE DIRBE/Zodi-Subtracted Mission Average (ZSMA) Skymap represents the extra-Solar system sky brightness. It is the average residual map that results after the modelled interplanetary dust (IPD) signal is subtracted from each of the DIRBE Weekly Skymaps from the cryogenic mission. Individual weekly residual maps can be reconstructed from the data supplied in the DIRBE Sky and Zodi Atlas (DSZA). Provenance: COBE Team. This is a service of NASA HEASARC.