VS08L Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Richard Dodson
Date Prepared: 20-09-2004
 

Summary
 
Observation code : VS08L    AIPS Version : 31DEC03   
Date of Observation : 2001/127    Difmap Version : 2.4a 
Source Name : J0450-81    vsop_difmap used : No 
Calibration Source(s) : J0303-62,J0635-75,J1058-80         
Ground telescopes : MP CD HO HH  Model Fitted to data : Yes 
Tracking Station(s) : UZ    Image made : Yes 
Correlator : Penticton         

 
Abstract
The levels are a mess -- and can not be right. Hobart has a poor solution. Baseline errors all over the place.

Only 64 channels I wonder if that was too few. If the delays were much higher ... This might be around the time Hobart recorded RR for a few months but why would the problem be baseline based?

Comparing it to other observations of J0450-81 (calibration scans) which are all point sources about 1 Jy I decide to scale up Ceduna by ~ 4 and delete Hobart. Resonable structure resulted.
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
0.765604 0.00000 0.00000 0.351931 0.618181 15.3234 0.4880
0.161198 0.484438 36.6194 0 0 0 0.0000
0.113723 0.390501 -148.365 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'
 
 
 
 
 The original ANTAB (nominal) was improved by finding the correct Tsys values for most antennae. 
APCAL
 
 
 
1 
  
CLCAL refant=1;
1 
1 
2 
 
 Amplitude calibration solutions applied. Cd as ref 
FRING docal -1; dparm 2,400,400,0.5,0;aparm(7)=0.1;solint
   5,10,15
 
 
 
2,3,4 
  
UVFLG flagval 1;ante 4;
timer 0 11 14 0 0 15 53 30/0
   7 32 0 0 9 38 30
 
 
 
 
 Gaps in Mopra. I ended up not using the flag table 
FRING refa 2/4; dparm 2,600/150/0,100/150/0,0.5,0;solint
   10;flagv 1/-1
 
 
 
5,6,7,9,11 
 hobart is ugly. Searching for a good solution 
SNEDT
 
7,9 
 
8,10 
 realise many sols lost with the flag table 
CLCAL interp 'ambg'/'self'
2 
10 
3,4 
 
  
TACOP/CLCOR ante 5;opc 'sbdl';clcorp
   150;timer 0 14 0 0 0 16 0
2 
 
5 
 
 prepare for a tight search 
FRING refa 2;dparm 2,100,200,0.5;solint
   5;flagv -1
5 
 
 
12 
  
SNEDT/CLCAL interpo 'self'
5 
12 
6 
13 
  
SPLIT aparm(1)=2 0;
4 
 
 
 
 Av within IF 
FITTP
 
 
 
 
 Data written out for analysis in Difmap amplitude 

AIPS Input Files
ANTAB.TXT
 Comments
used nominal_tsys.pl

AIPS Output Files
DTSUM_0.LIS
DTSUM_1.LIS
LISTR.LIS
PRTAN.LIS
POSSM.PS
VPLOT.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.PS
SN_FRING01_RAT.PS
UVPLT_UV.PS
UVPLT_UVD.PS
UVPLT_UVPA.PS
IMAGE.FITS


Difmap Data Reduction Notes
Phase selfcal applied? Yes
Global amplitude selfcal (gscal) applied? Yes
Amplitude selfcal on non-global timescales used? No
Modelfit made and saved? Yes
Image Made and saved? Yes
Comments on Difmap processing

Image
Ampl, Phase vs (u,v) Distance
PS (69 kb)
JPEG (52 kb)
 Ampl, Phase vs Time
PS (222 kb)
JPEG 1, 2, 3		 (u,v) Coverage
PS (36 kb)
JPEG (34 kb)
Closure Phase vs Time
PS (231 kb)
JPEG 1, 2		 Clean Image
PS (29 kb)
JPEG (47 kb)
Modelfit
Ampl, Phase vs (u,v) Distance
PS (69 kb)
JPEG (52 kb)
 Ampl, Phase vs Time
PS (221 kb)
JPEG 1, 2, 3		 (u,v) Coverage
PS (36 kb)
JPEG (34 kb)
Closure Phase vs Time
PS (231 kb)
JPEG 1, 2		 Image with model components
PS (30 kb)
JPEG (36 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)
0.765604 0.00000 0.00000 0.351931 0.618181 15.3234 0.4880
0.161198 0.484438 36.6194 0 0 0 0.0000
0.113723 0.390501 -148.365 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 Tue Sep 21 09:09:26 GMT 2004
by db_results.pl version 0.3.