Spectral information in CASA - ESO
Spectral information in CASA - ESO
Spectral information in CASA - ESO
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<strong>Spectral</strong> <strong><strong>in</strong>formation</strong> storage <strong>in</strong> <strong>CASA</strong> objects<br />
<strong>CASA</strong> Images can (and typically do) have a <strong>Spectral</strong> Axis.<br />
<strong>CASA</strong> MeasurementSets have <strong>Spectral</strong> W<strong>in</strong>dows.<br />
May be displayed (for a given reference frame) as<br />
frequency = f = the <strong>in</strong>ternal format<br />
wavelength = c/f<br />
and with given rest freq: radio velocity = c(f rest<br />
– f)/f rest<br />
optical velocity =<br />
c(f – f rest<br />
)/f<br />
etc.<br />
<strong>Spectral</strong> <strong><strong>in</strong>formation</strong> <strong>in</strong>ternally always stored as frequencies<br />
(+ unit + reference frame)<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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