Spectral information in CASA - ESO
Spectral information in CASA - ESO
Spectral information in CASA - ESO
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<strong>Spectral</strong> Transformation <strong>in</strong> cvel and clean<br />
ALMA data come usually <strong>in</strong> the TOPO frame.<br />
When transform<strong>in</strong>g from TOPO to a different frame, cvel and clean<br />
will perform software-Doppler-track<strong>in</strong>g<br />
= time-dependent regridd<strong>in</strong>g of the visibilties,<br />
even if number of channels and resolution don't change!<br />
Reference po<strong>in</strong>t of time is the first observation of the field <strong>in</strong> question.<br />
Necessary for essentially all scientific analysis.<br />
Typical syntax to get maximum resolution and not discard any data:<br />
cvel or clean (..., mode='channel', nchan=-1, width=1, start=0, outframe='LSRK')<br />
these are the default and can be omitted<br />
your choice<br />
D. Petry, <strong>Spectral</strong> <strong><strong>in</strong>formation</strong> <strong>in</strong> <strong>CASA</strong>, February 2013<br />
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