[daip] [!7774]: AIPS - Continuum subtraction in spectral line data cube.
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Thu May 12 10:47:09 EDT 2016
Eric Greisen updated #7774
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Staff (Owner): Amy Mioduszewski (was: Eric Greisen)
Status: Closed (was: Response Overdue)
Due: - Cleared - (was: 07 January 2016 06:25 AM)
Continuum subtraction in spectral line data cube.
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Ticket ID: 7774
URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/7774
Full Name: Yogesh Chandola
Email: yogesh.chandola at gmail.com
Creator: User
Department: AIPS Data Reduction
Staff (Owner): Amy Mioduszewski
Type: Issue
Status: Closed
Priority: Default
Template Group: Default
Created: 30 December 2015 09:06 AM
Updated: 31 December 2015 06:24 AM
> It would appear that the continuum model that you UVSUBed
> did not contain (correctly) all of the continuum flux. Is this at
> L band? Did you use multiple facets to do your continuum imaging?
> A large field, especially at P or L or even S band, will require multiple
> facets to get the geometry correct. If the geometry is not
> correct sources will not subtract properly.
>
> If the remaining continuum looks simple (not all sorts of spokes
> and clutter), then you could simply subtract the residual continuum
> with IMLIN or XBASL.
>
> Eric Greisen
>
>
Yes, it is L band data and I have used multiple facets to do continuum imaging as well as for making spectral line cubes. Should I use IMLIN on each facet cube separately and then FLATN or first FLATN and then IMLIN? IMLIN is also known to have problems while subtracting continuum off from the phase center.
Yogesh
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