====== DRAO 22 MHz radio continuum/ 1.4 GHz polarization ======
/* AH: 25/08/18
should we separate this page into two separate surveys (22MHz, 1.4GHz polar)?
*/
This 22 MHz radio continuum survey covers ~73% of the sky between declination -28° and +80°, derived from observations with the radiotelescope at the Dominion Radio Astrophyical Observatory (DRAO), at a resolution of 1.1°x1.7°secant(zenith angle). Units of the map are ''KTB''.
The Q and U maps are the combination of the 26-m DRAO (Dominion Radio Astrophysical Observatory) and the 30-m Villa Elisa polarization survey, at 1.4 GHz (21 cm), with an angular resolution of 36'. Units of the maps are ''mKTB''.
The Villa Elisa 30-m telescope was used to map the southern sky simultaneously in continuum and linear polarization, yielding a fully sampled map of the 21cm linearly polarized emission for declinations between -10 and -90 degrees. Data in the overlap region between -10 and -27 degrees was used to match the Villa Elisa survey's zero-level with that of the DRAO 1.4 GHz linear polarization survey.\\
Healpix maps made by D. Paradis
=== Reference for the 22 MHz survey ===
'The radio emission from the Galaxy at 22 MHz' by Roger, R. et al. 1999, A&AS, 137, 7
http://adsabs.harvard.edu/abs/1999A%26AS..137....7R
=== References for the 1.4 GHz polarization surveys ===
* 'An absolutely calibrated survey of polarized emission from the northern sky at 1.4 GHz. Observations and data reduction' by Wolleben, M. et al. 2006, A&A, 448, 411 http://adsabs.harvard.edu/abs/2006A%26A...448..411W
* 'A fully sampled λ21 cm linear polarization survey of the southern sky' by Testori, J. et al. 2008, A&A, 484, 733 http://adsabs.harvard.edu/abs/2008A%26A...484..733T
^ __**DRAO 22 MHz**__ ^ __**DRAO+Villa Elisa 1.4 GHz POLU**__ ^ __**DRAO+Villa Elisa 1.4 GHz POLQ**__ ^
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=== Maps ===
- 22 MHz : [[http://cade.irap.omp.eu/documents/Ancillary/DRAO/DRAO_22MHz_1_256.fits| DRAO_22MHz_1_256.fits]]
- 1.4 GHz POLU : [[http://cade.irap.omp.eu/documents/Ancillary/DRAO/DRAO_VillaElisa_21cm_POLU_1_256.fits| DRAO_VillaElisa_21cm_POLU_1_256.fits]]
- 1.4 GHz POLQ : [[http://cade.irap.omp.eu/documents/Ancillary/DRAO/DRAO_VillaElisa_21cm_POLQ_1_256.fits| DRAO_VillaElisa_21cm_POLQ_1_256.fits]]
=== HiPS===
DRAO HiPS are available in Aladin Collections/Image
=== Original WCS data ===
http://www3.mpifr-bonn.mpg.de/survey.html