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Spectral Elements
If
Up to 4 spectral windows
has been selected, a table appearswhich is used to enter the specifications of each spectralwindow. Lines are added or removed using the following:
-
Select Lines to Observe...
: This opens the Spectral Line Selection Tool which interfaces to the Splatalogue. Lines chosen here will be added to the table.
-
Add
: This adds a blank row to the table. The parameters must be added manually.
-
Delete
: This will delete the selected row from the table.
Once a row has been added to the table, the following parameters areshown and can, in most cases, be edited:
Figure 5.5:
The Spectral Elements panel in the Science Goal Spectral Setup.
|
-
Center Freq Rest
: The centre rest frequency of the spectral window.
-
Center Freq Sky
: The centre sky frequency of the spectral window. This is not editable.
-
Transition
: A standard name for a spectral line transition, e.g. CO (1-0). This is usually filled in if a line has been chosen using the Spectral Line Selection Tool.
-
Bandwidth, Channel Spacing
: The bandwidth and channel spacing of the spectral window. The available choices are constrained to take specific values reflecting the hardware restrictions. Please note that the channel spacing is not the same as the spectral resolution. The latter (which can be thought of as the observed width of a spectral line with intrinsic zero width) is a function of the weighting scheme used in the correlator and, for the default choice of Hanning smoothing, is equal to twice the channel spacing. The choice of smoothing cannot currently be set at Phase 1. Finally, note that the maximum usable bandwidth is actually 1.8 GHz. Therefore, for those modes that are wider than this, the edge channels will need to be flagged.
-
Process As Continuum
: Check the box if this spectral window is intended to provide a measurement of a source's continuum.
More than 4 spectral windows
is not available at Cycle 0.
Next:
Single Continuum
Up:
Spectral Setup
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The ALMA OT Team, 2011 May 20