next up previous contents
Next: Spectral scans Up: Configure the spectral setup Previous: Spectral Line   Contents


Single Continuum

Selecting the Single continuum option is basically a shortcut to defining 4 continuum spectral windows maximising the available bandwidth (see Fig. 3.3). You are presented with a drop-down list of standard continuum frequency setups for each of the available ALMA bands, chosen so as to optimise atmospheric transparency. The sky frequency of the setup can be changed to anything that still yields a valid spectral setup, but any deviation from the standard frequencies must be fully justified in Step 3.9.

to to by -2 bp
Image Warning-icon-hi Single Continuum and Spectral Scan observations are specified in the sky reference frame. Unlike for Spectral Line mode, the velocity information entered in Step 3.4 is ignored, and all sources are observed with the same frequency tuning.
0.85 0.85 0.85 rg


width height depth 0 0 0 rg =0bpto

The spectral windows set up by the OT based on the input continuum frequency for each baseband are listed in the spectral window tables and visualised in the spectral viewer. Note that the sky frequency specified corresponds to the LO frequency and is not itself observed for Bands 3, 4, 6, 7 and 8. For Bands 9 and 10, the sky frequency corresponds to the frequency at the centre of the 8 GHz wide upper sideband.


next up previous contents
Next: Spectral scans Up: Configure the spectral setup Previous: Spectral Line   Contents
The ALMA OT Team, 2018 Sep 25