[mmaimcal]Memo 428

[mel wright 456]

Hi,

I did a bit more comparing the 3 sample compact configs . I  combined
mosaic images
with single dish data.   Miriad offers several  algorithms.  I could not
get the
joint deconvolution of interferometer and single dish to converge -
possibly because there
 is no  overlap in spatial frequencies between the single dish and
interferometer data.
Using the single dish as the default image, mosmem converged quickly. So
far there
does not seem to much difference in the results with the  3
configurations.  More
things to try next week.

cheers,

Melvyn.

-------------- next part --------------
   ---  ALMA Mosaicing (Cas A model)   ---   
 config  = config1
 dec     = -30
 scale   = 0.03
 harange = -1,1,.013  hours
 select  = -shadow(12)
 freq    = 230
 nchan   = 1
 imsize  = 129
 region  = arcsec,box(15,-15,-15,15)
 
   ---  TIMING   ---   
START: Fri Jun 28 17:21:35 PDT 2002
Generate uv-data. Tsys=40K, bandwidth=8 GHz 
Scale model size. from pixel 0.4 to 0.03 arcsec
Make model images for each pointing center
Make model uv-data using VLA image of Cas A as a model (the model has the VLA primary beam)
UVMODEL: Fri Jun 28 17:25:58 PDT 2002 add the model to the noisy sampled uv-data
INVERT: Fri Jun 28 17:30:50 PDT 2002
Make single dish image and beam Fri Jun 28 17:31:59 PDT 2002
Single dish FWHM = 24 arcsec at 230 GHz
Joint deconvolution of interferometer and single dish data
MOSMEM: Fri Jun 28 17:37:54 PDT 2002
convolve the model by the beam and subtract from the deconvolved image
regrid the convolved model to the deconvolved image template
FINISH: Fri Jun 28 17:39:47 PDT 2002
 
   ---  RESULTS   ---   
 Config  DEC  HA[hrs]       Beam[arcsec] scale Model_Flux,Peak Image_Flux,Peak Residual:Rms,Max,Min[Jy]
config1  -30  -1,1,.013     1.70 1.69    0.03  731.580 14.249  756.762 14.230   0.134  0.335  -0.273
config1  -30  -1,1,.013     1.70 1.69    0.03  731.580 14.249  671.239 13.853   0.153  0.688  -0.506 niters=30 rmsfac=40000
config1  -30  -1,1,.013     1.70 1.69    0.03  731.580 14.249  710.101 14.035   0.076  0.334  -0.247 niters=30 rmsfac=20000
config1  -30  -1,1,.013     1.70 1.69    0.03  731.580 14.249  732.112 14.137   0.038  0.156  -0.118 niters=50 rmsfac=10000
config2  -30  -1,1,.013     1.28 1.27    0.03  731.616 8.937   717.376  8.857   0.041  0.194  -0.141
config5  -30  -1,1,.013     1.74 0.87    0.03  731.586 8.465   718.574  8.383   0.041  0.194  -0.147
config1   30  -1,1,.013     2.82 1.70    0.03  731.534 21.011  743.387 20.877   0.053  0.226  -0.174
config2   30  -1,1,.013     2.11 1.28    0.03  731.602 13.290  748.073 13.340   0.023  0.084  -0.066
config5   30  -1,1,.013     1.70 1.44    0.03  731.583 12.573  748.930 12.504   0.027  0.094  -0.073