[daip] forwarded message from papadop at phys.ethz.ch

Tue Nov 30 15:32:31 EST 2004

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From: papadop at phys.ethz.ch
To: Eric Greisen <egreisen at nrao.edu>
Subject: A question on flux density scales
Date: Tue, 30 Nov 2004 19:55:04 +0100

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Hi again Eric,

I discovered a rather strange thing on the flux measurement of the 2ndary,

I do my editing and produce an SN table for freqid 2, and have also set the
fluxes of 1331+305 using SETJY with 'CALC' option  and that of 0713+438
with the option of putting it by hand (I have set I, Q, U, V = 0.55, 0, 
0, 0).

Then I do a GETJY on the 2ndary 06465+44513 (after I have used SETJY to
set it to zero).

In the attachement you can see the results of doing this using a) both 
primary calibrators
b)  only 1331+305, and c) only 0713+438.

The fluxes I get for the 2ndary are disturbingly different.....,

I am at a loss....

again thanks for your help

Padelis

PS: The CALIB was run for all 3 cal sources with no UV restrictions (D 
array, K Band)
     the results you can see also in the attached file (I have chosen 
soltype 'R')

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localh> CALIB1: Antenna 10 had     1 excess closure errors
localh> CALIB1: Antenna 11 had     1 excess closure errors
localh> CALIB1: Found         4792 good solutions
localh> CALIB1: Failed on        4 solutions
localh> CALIB1: Fraction of times having data > 2.5 rms from solution
localh> CALIB1: 0.51208 of the times had  0 -  2 percent outside 2.5 times rms
localh> CALIB1: 0.14976 of the times had  2 -  4 percent outside 2.5 times rms
localh> CALIB1: 0.03865 of the times had  4 -  6 percent outside 2.5 times rms
localh> CALIB1: 0.03382 of the times had  6 -  8 percent outside 2.5 times rms
localh> CALIB1: 0.03865 of the times had  8 - 10 percent outside 2.5 times rms
localh> CALIB1: 0.04348 of the times had 10 - 12 percent outside 2.5 times rms
localh> CALIB1: 0.01932 of the times had 12 - 14 percent outside 2.5 times rms
localh> CALIB1: 0.01932 of the times had 14 - 16 percent outside 2.5 times rms
localh> CALIB1: Appears to have ended successfully
- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------

WITH BOTH 1331+305, 0713+438

localh> CALIB1: localhost    31DEC04 TST: Cpu=       0.7  Real=       1
localh> GETJY1: Task GETJY  (release of 31DEC04) begins
localh> GETJY1:    Source:Qual      CALCODE IF  Flux (Jy)
localh> GETJY1: 06465+44513     :  0   A     1    3.98157 +/-   0.13750
localh> GETJY1:                              2    3.94069 +/-   0.13479
- ----------------------------------------------------------------------------------
WITH ONLY 1331+305

localh> SETJY1: Appears to have ended successfully
localh> SETJY1: localhost    31DEC04 TST: Cpu=       0.0  Real=       0
localh> GETJY1: Task GETJY  (release of 31DEC04) begins
localh> GETJY1:    Source:Qual      CALCODE IF  Flux (Jy)
localh> GETJY1: 06465+44513     :  0   A     1    1.10579 +/-   0.06850
localh> GETJY1:                              2    1.10597 +/-   0.06705
localh> GETJY1: Appears to have ended successfully
- -------------------------------------------------------------------------------

with ONLY 0713+438

localh> GETJY1: Task GETJY  (release of 31DEC04) begins
localh> GETJY1:    Source:Qual      CALCODE IF  Flux (Jy)
localh> GETJY1: 06465+44513     :  0   A     1    0.80867 +/-   0.01006
localh> GETJY1:                              2    0.80837 +/-   0.00849
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