[daip] Spectrum of a blotch region

[Eric Greisen]

Gary A. Welch writes:

 > 
 > I don't have a second image to use in BLANK.  An optical image of the galaxy 
 > would work in principle, but I can't find out how to import something like that 
 > into AIPS.  

   If you have no optical image how do you know where the optical
contour is?

IMLOD, FITLD read all FITS images including optical.

OHGEO, HGEOM can repair geometry issues.

ERic Greisen

 > 
 > I'm searching for HI emission, and the cube shows no emission from the galaxy in 
 > question.  I'm trying to determine an upper limit on the HI flux within the 
 > optical contour.  My plan is to use BLSUM to sum the flux inside the optical 
 > contour from each channel.  I can derive the upper limit using the rms of the 
 > resulting spectrum and an assumed line width (i.e. the "single dish" approach).
 > 
 > Gary
 >