HEALPix, nested, res 8 (Nside=256)
Original Data Source
This is an all-sky 1420 MHz (21cm) continuum map formed from surveys of the northern sky with the 25-m Stockert telescope and the southern sky with the 30-m Villa-Elisa telescope. The units of the map are mK TB full beam, the effective resolution is about 35', the effective sensitivity is about 50 mK TB full beam (about 3 times the rms noise), the gain scale accuracy is about 5%, and the zero level accuracy is 0.5 K.
The Centre d'Analyse de Donńees Etendues group used the data 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. The original World Coordinate System format data are available from the MPIfR Survey Sampler site.
"A radio continuum survey of the northern sky at 1420 MHz. I", Reich, W. 1982, A&AS, 48, 219, ADS
"A radio continuum survey of the northern sky at 1420 MHz. II", Reich, P. and Reich, W. 1986, A&AS, 63, 205, ADS
"A radio continuum survey of the southern sky at 1420 MHz. Observations and data reduction", Testori, J. C., et al. 2001, A&A, 368, 1123, ADS
"A radio continuum survey of the southern sky at 1420 MHz. The atlas of contour maps", Reich, P., Testori, J. C., and Reich, W. 2001, A&A, 376, 861, ADS