[daip] Re: Radio imaging problem

[Preeti Kharb]

Hi Eric

I have enclosed the header information from the uvdata, before and after
combining. In DBCON I used: DOPOS 1 -1, DOARRAY -1.

> Can you show me the headers of the uv data sets before and after DBCON
> and did you average spectral channels in these data sets first?

Yes I had averaged them: SPLIT with aparm 2 0

> Was your phase calibrator near your source?

Yes. We used 2355+498 for our 3C470 (2356+437).

>Did you self-cal the individual data sets?

Yes.


-Preeti
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A-array data:
=============

AIPS 1: Image=3C470     (UV)         Filename=3C470AL     .UVCOP .   2
AIPS 1: Telescope=VLA                Receiver=VLA
AIPS 1: Observer=AO170               User #=   22
AIPS 1: Observ. date=17-JUN-2003     Map date=29-NOV-2005
AIPS 1: # visibilities     10071     Sort order  TB
AIPS 1: Rand axes: UU-L-SIN  VV-L-SIN  WW-L-SIN  BASELINE  TIME1
AIPS 1:            WEIGHT  SCALE
AIPS 1: ----------------------------------------------------------------
AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
AIPS 1: COMPLEX      1   1.0000000E+00       1.00  1.0000000E+00    0.00
AIPS 1: STOKES       4  -1.0000000E+00       1.00 -1.0000000E+00    0.00
AIPS 1: FREQ         1   1.3449000E+09       1.00  2.5000000E+07    0.00
AIPS 1: IF           2   1.0000000E+00       1.00  1.0000000E+00    0.00
AIPS 1: RA           1    23 58 35.340       1.00       3600.000    0.00
AIPS 1: DEC          1    44 04 38.900       1.00       3600.000    0.00
AIPS 1: ----------------------------------------------------------------
AIPS 1: Coordinate equinox 2000.00
AIPS 1: Rest freq      0.000         Vel type: OPTICAL wrt YOU
AIPS 1: Alt ref. value  0.00000E+00  wrt pixel    1.00
AIPS 1: Maximum version number of extension files of type FQ is   1
AIPS 1: Maximum version number of extension files of type HI is   1
AIPS 1: Maximum version number of extension files of type OF is   1
AIPS 1: Maximum version number of extension files of type AN is   1
AIPS 1: Maximum version number of extension files of type SN is   3
AIPS 1: Maximum version number of extension files of type WX is   1

B-array data:
=============

AIPS 1: Image=3C470     (UV)         Filename=3C470BL     .UVCOP .   2
AIPS 1: Telescope=VLA                Receiver=VLA
AIPS 1: Observer=AO170               User #=   22
AIPS 1: Observ. date=30-NOV-2003     Map date=29-NOV-2005
AIPS 1: # visibilities     16131     Sort order  TB
AIPS 1: Rand axes: UU-L-SIN  VV-L-SIN  WW-L-SIN  BASELINE  TIME1
AIPS 1:            WEIGHT  SCALE
AIPS 1: ----------------------------------------------------------------
AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
AIPS 1: COMPLEX      1   1.0000000E+00       1.00  1.0000000E+00    0.00
AIPS 1: STOKES       4  -1.0000000E+00       1.00 -1.0000000E+00    0.00
AIPS 1: FREQ         1   1.4649000E+09       1.00  2.5000000E+07    0.00
AIPS 1: IF           2   1.0000000E+00       1.00  1.0000000E+00    0.00
AIPS 1: RA           1    23 58 35.340       1.00       3600.000    0.00
AIPS 1: DEC          1    44 04 38.900       1.00       3600.000    0.00
AIPS 1: ----------------------------------------------------------------
AIPS 1: Coordinate equinox 2000.00
AIPS 1: Rest freq      0.000         Vel type: OPTICAL wrt YOU
AIPS 1: Alt ref. value  0.00000E+00  wrt pixel    1.00
AIPS 1: Maximum version number of extension files of type FQ is   1
AIPS 1: Maximum version number of extension files of type HI is   1
AIPS 1: Maximum version number of extension files of type OF is   1
AIPS 1: Maximum version number of extension files of type AN is   1
AIPS 1: Maximum version number of extension files of type SN is   3
AIPS 1: Maximum version number of extension files of type WX is   1

A+B combined data:
==================

AIPS 1: Image=3C470     (UV)         Filename=3C470ABL    .DBCON .  17
AIPS 1: Telescope=VLA                Receiver=VLA
AIPS 1: Observer=AO170               User #=   22
AIPS 1: Observ. date=17-JUN-2003     Map date=29-NOV-2005
AIPS 1: # visibilities     26202     Sort order  TB
AIPS 1: Rand axes: UU-L-SIN  VV-L-SIN  WW-L-SIN  BASELINE  TIME1
AIPS 1:            WEIGHT  SCALE
AIPS 1: ----------------------------------------------------------------
AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
AIPS 1: COMPLEX      1   1.0000000E+00       1.00  1.0000000E+00    0.00
AIPS 1: STOKES       4  -1.0000000E+00       1.00 -1.0000000E+00    0.00
AIPS 1: FREQ         1   1.3449000E+09       1.00  2.5000000E+07    0.00
AIPS 1: IF           2   1.0000000E+00       1.00  1.0000000E+00    0.00
AIPS 1: RA           1    23 58 35.340       1.00       3600.000    0.00
AIPS 1: DEC          1    44 04 38.900       1.00       3600.000    0.00
AIPS 1: ----------------------------------------------------------------
AIPS 1: Coordinate equinox 2000.00
AIPS 1: Rest freq      0.000         Vel type: OPTICAL wrt YOU
AIPS 1: Alt ref. value  0.00000E+00  wrt pixel    1.00
AIPS 1: Maximum version number of extension files of type AN is   2
AIPS 1: Maximum version number of extension files of type HI is   1
AIPS 1: Maximum version number of extension files of type OF is   1
AIPS 1: Maximum version number of extension files of type SN is   5
AIPS 1: Maximum version number of extension files of type WX is   1
AIPS 1: Maximum version number of extension files of type FQ is   1