VS02C Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Richard Dodson
Date Prepared: 10-06-2004
 

Summary
 
Observation code : VS02C    AIPS Version : 31DEC03   
Date of Observation : 1999/247    Difmap Version : 2.4a 
Source Name : J0538-4405    vsop_difmap used : No 
Calibration Source(s) : 0607-157         
Ground telescopes : HO, MP, HH  Model Fitted to data : Yes 
Tracking Station(s) : GZ, TZ    Image made : No 
Correlator : Penticton         

 
Abstract
does not match Tingay's GOT observations
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
3.49551 0.0457370 -87.5248 0.209265 1.00000 0.00000 3.8953
2.09740 0.738284 87.6727 0.462467 1.00000 0.00000 0.4786
1.08994 0.212235 106.685 0.00000 1.00000 0.00000 0.0000
(*) 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 clint = 0.25
digicor = -1
delcorr = -1
 
 
 
 
  
INDXR cparm = 0, 0, 0.25;
 
 
1 
 
  
ANTAB infile='antab.txt'
 
 
 
 
  
APCAL
 
 
 
1 
  
CLCAL refant=1;
1 
1 
2 
 
 Amplitude calibration solutions applied. 
CLCOR opcode 'gain';antenna 0;clcorprm
   1.078,0
2 
 
2 
 
  
FRING docal -1; dparm 2,0,0,0.5,0;aparm(7)=0.1;solint
   5,10,15
 
 
 
3,4,5,6,7 
 Full range searched. more than 250 nsec, >-60 mHz 
SNEDT
7 
 
8 
 
  
CLCAL 'ambg'/'cube'
2 
8 
3,4 
 
 High rate rate requires cubic 
CLCOR opcode 'gain';antenna 0;clcorprm
   1/.9055,0
2,3,4 
 
2,3,4 
 
 Correct the correction 
SPLIT aparm(1)=2 0;
4 
 
 
 
 Av within IF 
FITTP
 
 
 
 
 Data written out for analysis in Difmap 

AIPS Input Files
ANTAB.TXT Comments
used nominal_tsys.pl

Additional Files
NameDescription
SUR2C.0JPSurvey run file

AIPS Output Files
PRTAN.LIS
LISTR.LIS
DTSUM_0.LIS
DTSUM_1.LIS
POSSM.PS
VPLOT_AP_1.PS
VPLOT_AP_2.PS		 UVPLT_UV.PS
UVPLT_UVD.PS
UVPLT_UVPA.PS
SN_APCAL_AMP_2.PS
SN_APCAL_AMP_1.PS
SN_CALIB_DEL_1.PS
SN_CALIB_DEL_2.PS		 SN_CALIB_RAT_1.PS
SN_CALIB_RAT_2.PS
SN_CALIB_SNR_1.PS
SN_CALIB_SNR_2.PS
SN_CALIB_PHA_1.PS
SN_CALIB_PHA_2.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
The model of the same source, observed a year before as a GOT experiment, does not match. The GOT model falls short by about 4 Jy on the shortest baselines. The reference source is consistent with the VLBA pre-launch given a small amount of variation. The light curve implies that the flux could have jumped up significantly, but it is against the run of play.

The site of the second component is consistent with that of the 1998 image.

The Northern component in the earlier image, also seen in the VBLA K band images (2003), could not seen and would be about 1 sigma.

Modelfit
Ampl, Phase vs (u,v) Distance
PS (32 kb)
JPEG (41 kb)
 Ampl, Phase vs Time
PS (111 kb)
JPEG 1, 2		 (u,v) Coverage
PS (18 kb)
JPEG (27 kb)
Closure Phase vs Time
PS (71 kb)
JPEG 1		 Image with model components
PS (35 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)
3.49551 0.0457370 -87.5248 0.209265 1.00000 0.00000 3.8953
2.09740 0.738284 87.6727 0.462467 1.00000 0.00000 0.4786
1.08994 0.212235 106.685 0.00000 1.00000 0.00000 0.0000
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Fri Aug 6 04:41:02 GMT 2004
by db_results.pl version 0.3.