[Almasci] Re: [mmaimcal]Re: Comment in ALMA memo 489

[mel wright 456]

Hello Stephane,

I have compared 3 approaches for deconvolving with single dish and
interferometer data
with the same or different primary beams: i) constraining  the total
flux, ii) using a default
image, and iii) joint deconvolution.

The joint deconvolution almost always gives the best image fidelity,
which one can
understand by watching the convergence; the deconvolutions of different
sized structures
assist each other in iteratively converging to the true source
distribution. 

I used the MEM algoriths in MIRIAD, but the same 3 approaches can also
be done using CLEAN.
Joint deconvolution of single dish (using the single dish primary
beam(s)),
and interferometer array(s) using their synthesised beam(s) could be
done using a
multiresolution clean algorithm. 

MEM gives nice results, but is quite time consuming.  It would be nice
to
have an objective comparison with clean based algorithms.

Best wishes,


Melvyn