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ALMA Sensitivity Calculator
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ALMA Sensitivity Calculator
Contents
Index
-
Dec
: Declination of the target - used for calculating the airmass.
-
Polarization
: How many polarizations are to be used -
Dual
or
Single
.
-
Observing Frequency
: The observing frequency - sets the atmospheric opacity based on the
Water Vapour Column Density
.
-
Bandwidth per polarization
: The bandwidth over which the sensitivity is calculated. Should be 7.5 GHz for continuum observations and the narrowest channel for spectral line.
-
Water Vapour Column Density
: Precipitable water vapour column density in mm. The octiles based on many years of monitoring at the ALMA site are offered as choices.
Calculator Chooses
will choose an appropriate value for the observing frequency.
-
tau/Tatm
: Displays the opacity and atmospheric temperature values used.
-
Tsys
: Displays the system temperature value used.
Figure 3.4:
The ALMA Sensitivity Calculator.
|
The ALMA OT Team, 2011 May 20