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information_for_astronomers:user_guide:nod2_manual
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information_for_astronomers:user_guide:nod2_manual [2013/06/12 21:24] 127.0.0.1 external edit |
information_for_astronomers:user_guide:nod2_manual [2025/05/17 10:40] (current) akraus |
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| Multi-horn systems: As the horns are fixed in the secondary focus, scanning must be done in **azimuth-elevation system** to allow for restoration of the signals. The maps need to be larger in azimuth by the maximum beam separation on sky, plus one additional beam at each side to improve the baselevel determination | Multi-horn systems: As the horns are fixed in the secondary focus, scanning must be done in **azimuth-elevation system** to allow for restoration of the signals. The maps need to be larger in azimuth by the maximum beam separation on sky, plus one additional beam at each side to improve the baselevel determination | ||
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| - | **NOTE: At present multi-horn mapping must be done in B1950.0 coordinates.** | ||
| Flux calibration is done by observing maps around at least two primary calibrators per session (3C48, 3C138, 3C286) for which the fluxes at all frequencies are well known. 3C138 and 3C286 are highly polarized and can also be used for calibration of the polarization angle. Maps on calibrators have standard sizes for each receiver (about 4x HPBW). 3C147 and 3C295 can be used as unpolarized calibrators. | Flux calibration is done by observing maps around at least two primary calibrators per session (3C48, 3C138, 3C286) for which the fluxes at all frequencies are well known. 3C138 and 3C286 are highly polarized and can also be used for calibration of the polarization angle. Maps on calibrators have standard sizes for each receiver (about 4x HPBW). 3C147 and 3C295 can be used as unpolarized calibrators. | ||
information_for_astronomers/user_guide/nod2_manual.txt ยท Last modified: 2025/05/17 10:40 by akraus
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