Foreground: Dwingeloo 820 MHz
Dwingeloo 820 MHz Continuum Map
HEALPix, nested, res 8 (Nside=256)
Original Data Source:
From Berkhuijsen (1972):
Contour maps of absolute brightness temperature at 820 MHz are presented (figures 4 and 5) being the result of a fully sampled continuum survey with the Dwingeloo telescope. The resolution of the map is 1.2 degrees. Correction for radiation into the antenna sidelobes has been made. The random error in the brightness temperatures is +-0.2 K; systematic effects between different parts of the map are smaller than 0.3 K. The absolute zero level is determined from a comparison with horn measurements and has a standard error of +-0.6 K if the theoretical value of the zenith extinction is assumed to be correct. The temperature scale is known to better than 6%. Polarization percentages are given in Table 10. A discussion of results will be given in a separate paper.
The Centre d'Analyse de Données Etendues group used the original brightness temperature data on a Galactic coordinate grid from the Max Planck Institute for Radioastronomy Survey Sampler site to form an all-sky HEALPix format map following the method described in Appendix A of Paradis et al. 2012, A&A, 543, 103, ADS. Their HEALPix map is mirrored here.
More details can be found in:
"A survey of the continuum radiation at 820 MHz between declinations -7 deg and +85 deg. I. Observations and reductions", Berkhuijsen, E. M. 1972, A&AS, 5, 263, ADS