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Expected Source Properties
One of the reasons for providing this information is to aid in technical assessment. All relevant items should be filled in or the project will not validate. This means that a continuum flux must be entered for a continuum project and a line flux and width must be filled in for a spectral line project. If full polarization is selected, at least one of the line or continuum polarization percentages must also be given.
- Peak Continuum Flux Density per Synthesized Beam: The expected flux density per synthesized beam of the source continuum. The weakest component that is to be detected should be entered for each source.
- Continuum Polarization Percentage: The expected degree of polarization for the source, expressed as a percentage of the peak continuum flux. The polarization of the weakest component should be entered. Note that if the polarization percentage is very low, then the OT will issue a validation error as it will not be possible to calibrate the data. The limits are 0.1 per cent for compact sources (LAS smaller than the angular resolution) and 1 per cent for extended sources.
- Peak Line Flux Density per Synthesized Beam: The expected peak flux density per synthesized beam of the line emission. The weakest component that is to be detected should be entered for each source. If the line is seen in absorption against a continuum, enter the depth of the line as a positive quantity.
- Line Polarization Percentage: The expected degree of polarization for the source, expressed as a percentage of the peak line flux. The polarization of the weakest component should be entered. A similar validation warning to the continuum value is issued.
- Line Width: The expected line width for the lines in this Science Goal (FWHM). The narrowest line that is to be detected should be entered for each source. The line width must be in velocity units.
Figure 5.2:
The Expected Source Properties panel in the Field Setup form for the Science Goal. This is taken from a redshift-survey (spectral scan) project for which the source also has a significant continuum.
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The ALMA OT Team, 2015 Sep 03