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.
Further details can be found in:
"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
