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Knowledgebase: Historical Articles
Why does beam-area conversion fail in AIPS for fits images exported with CASA?
Posted by Misato Fukagawa, Last modified by Sarah Wood on 19 February 2020 07:10 PM

The CASA task exportfits sets the header keyword BUNIT as 'JY/BEAM' in CASA 4.2 and earlier, whereas it is 'Jy/beam' in CASA >=4.3. The BUNIT keyword is case-sensitive and 'Jy/beam' is adopted as FITS standard. 

This change of the units can cause a problem on the beam-area conversion with some AIPS tasks if the AIPS version is <= 31DEC14 and the CASA version for exportfits is >=4.3. The issue has been fixed in the 31DEC15 version of AIPS. The solution for older versions of AIPS is to change the units in the header to 'JY/BEAM' from 'Jy/beam' with PUTHEAD. 


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