VS03T Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Jim Lovell
Date Prepared: 21-05-2001
 

Summary
 
Observation code : VS03T    AIPS Version : 31DEC99   
Date of Observation : 1998/241    Difmap Version : 2.3c 
Source Name : J0006-0623    vsop_difmap used : Yes 
Calibration Source(s) : 2255-282         
Ground telescopes : HH, HO, MP  Model Fitted to data : Yes 
Tracking Station(s) :     Image made : No 
Correlator : Penticton         

 
Abstract
Fringes found on all baselines. Extended structure model from VLBA PLS data was used as a fixed component and only the core model fitted. No amplitude scaling factors were used other than the sqrt(2) and Van Vleck factors.
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
1.09721 0.0314096 30.6409 0.608149 0.194155 24.7240 0.7457
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


AIPS Data Reduction Notes
 
Task
Adverbs
CL
in
SN
in
CL
out
SN
out
Comments
FITLD DELCOR=DIGICOR=-1
 
 
 
 
  
MSORT
 
 
 
 
  
INDXR aparm = 0,0,0.25
 
 
 
 
 read in scan breaks from PI letter 
ANTAB infile=ANTAB.TXT
 
 
 
 
  
APCAL
 
 
 
1 
 TY = GC = 1 
CLCAL refant=2, interpol=self
1 
1 
2 
 
  
TACOP
2 
 
3 
 
  
CLCOR OPCODE 'GAIN'
clcorprm
   0.906*sqrt(sqrt(2.0)),0
antennas 0
3 
 
3 
 
 Experiment correlated in October 1998 so requires both correction factors. 
CLCOR OPCODE 'SBDL'
clcorprm -760,-760,0
antennas 1,0
3 
 
3 
 
 Using delay offsets as suggested by DQA 
CLCOR OPCODE 'SBDL'
clcorprm 90,90,0
antennas 3,0
3 
 
3 
 
 Using delay offsets as suggested by DQA 
CLCOR OPCODE 'SBDL'
clcorprm 2530,2530,0
antennas 4,0
3 
 
3 
 
 Using delay offsets as suggested by DQA 
FRING docalib 1
gainuse 3
refant 2
solint 5
dparm 0,300,200,1,1,0
timerang 0,19,0,0,0,20,0,0
aparm 2,0,0,0,0,2,0.1,0,1,0
3 
 
 
2 
 Checking delay offsets had the right sign. Seems OK 
FRING docalib 1
gainuse 3
refant 2
solint 5
dparm 0,300,200,1,0
timerang 0
aparm 2,0,0,0,0,2,0.1,0,1,0
3 
 
 
3 
 Full fringe-fit. 5-min solution interval 
FRING docalib 1
gainuse 3
refant 2
solint 10
dparm 0,300,200,1,0
timerang 0
aparm 2,0,0,0,0,2,0.1,0,1,0
3 
 
 
4 
 Full fringe-fit. 10-min solution interval 
SNEDT
 
4 
 
5 
 removed bad solutions 
CLCAL interpol 'ambg'
refant 2
3 
5 
4 
 
  
SPLIT aparm 2,0
4 
 
 
 
  
FITTP
 
 
 
 
  

AIPS Input Files
ANTAB.TXT
INDXR.TXT		 Comments
- None -

AIPS Output Files
DTSUM_0.LIS
DTSUM_1.LIS
LISTR.LIS
PRTAN.LIS
POSSM01_AP_1.PS
SN_APCAL_AMP_1.PS
SN_APCAL_AMP_2.PS
SN_CALIB_DEL_1.PS
SN_CALIB_DEL_2.PS		 SN_CALIB_PHA_1.PS
SN_CALIB_PHA_2.PS
SN_CALIB_RAT_1.PS
SN_CALIB_RAT_2.PS
SN_CALIB_SNR_1.PS
SN_CALIB_SNR_2.PS
SN_FRING01_DEL_1.PS
SN_FRING01_DEL_2.PS
SN_FRING01_RAT_1.PS		 SN_FRING01_RAT_2.PS
SN_FRING01_SNR_1.PS
SN_FRING01_SNR_2.PS
UVPLT_UV.PS
UVPLT_UVD.PS
UVPLT_UVPA.PS


Difmap Data Reduction Notes
Phase selfcal applied? Yes
Global amplitude selfcal (gscal) applied? No
Amplitude selfcal on non-global timescales used? No
Modelfit made and saved? Yes
Image Made and saved? No
Comments on Difmap processing
Did vs_load and some flagging Model fitted VLBA PLS data and read in the model, deleting the core component and fixing all parameters of the two extended components. HALCA baselines upweighted by factor of 100 and a single model component fitted to remaining flux.

Some evidence that the IF's need re-scaling to the same flus level. However this has little effect on the final model fit.

Modelfit
Ampl, Phase vs (u,v) Distance
PS (32 kb)
JPEG (38 kb)
 Ampl, Phase vs Time
PS (122 kb)
JPEG 1, 2		 (u,v) Coverage
PS (16 kb)
JPEG (25 kb)
Closure Phase vs Time
PS (99 kb)
JPEG 1		 Image with model components
PS (33 kb)
JPEG (39 kb)

More details on the Images and Modelfits are found in this page.

Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
1.09721 0.0314096 30.6409 0.608149 0.194155 24.7240 0.7457
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Mon May 21 05:45:37 GMT 2001
by db_results.pl version 0.3.