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12 Meter Telescope - Observed Frequency Statistics

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The following plots show the relative frequency occupancy of observations done at the NRAO 12 Meter Telescope at Kitt Peak, from September 1999 to the beginning of this week. The statistics were calculated on the basis of "scans" rather than strictly observing time, but the difference should be minimal. The figures shown are statistical summaries, binned every 500 MHz.

  • There is a bias towards lower frequencies in the plots, simply because of the atmosphere at Kitt Peak, which will influence the observers' choice of frequency. In addition, the 1mm receivers at the 12 Meter are not normally made available throughout the observing season, because of expected opacities at certain times of year. The 3mm receivers are normally available throughout the season.
  • It is interesting to see the low-frequency tail on the 115 and 230 GHz 12CO lines, presumably because of observations of red-shifted 12CO.

    The relative percentage occupancy of frequencies (blue histogram), shown with an atmospheric zenith transparency curve assuming 4mm PWV (red dotted line).


    A "yes or no" plot of frequency occupancy (blue histogram) shown with an atmospheric zenith transparency curve assuming 4mm PWV (red dotted line).



    Last modified 29 October 1999; Webmaster