VS10N Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Richard Dodson
Date Prepared: 25-08-2004
 

Summary
 
Observation code : VS10N    AIPS Version : 31DEC03   
Date of Observation : 2003/275    Difmap Version : 2.4a 
Source Name : J1809-45    vsop_difmap used : No 
Calibration Source(s) : J1957-38         
Ground telescopes : HO HH  Model Fitted to data : Yes 
Tracking Station(s) : UZ    Image made : Yes 
Correlator : Mitaka/Penticton         

 
Abstract
Space fringes for a limited period. Weak source fitted with two point sources, but a elliptical Gaussian also works.
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
0.111309 0.0991474 -74.6942 0 0 0 0.0000
0.0615639 0.285903 119.998 0 0 0 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 
  
ACCOR solint 5
 
 
 
2 
  
CLCAL refant=1;
1 
1,2 
2,3 
 
 Amplitude calibration solutions applied. 
CLCOR opcode 'gain';antenna 0;clcorprm
   1.063,0
3 
 
3 
 
  
FRING docal -1; dparm 2,400,400,0.5,0;aparm(7)=0.1;solint
   5,10,15
 
 
 
3,4,5 
 No fringes for start of HALCA. 
SNCOR/CLCAL ante 5;opc 'zphs'/'zrat'/'zdel';interp
   'cube';sour 'j1809-45''
3 
5 
4 
5 
  
KRING dofit 3;cparm 0.5 0/100/200
    0/300/400, -1 0;solm
   ''/'rd'
4 
 
 
6,7,8,9,10 
 Dig around to get it 
SNEDT
 
8 
 
11 
 Clean up 
CLCAL interpo 'poly';intp 5;
4 
11 
5 
 
 get a little closer 
FRING dparm 2,30,30,0.5,0;aparm(5)=0/1;solint
   5
5 
 
 
12,13 
 No fringes for start of HALCA. 
CLCAL interpo 'ambg';
5 
12,13 
6,7 
 
 Tried a few approaches. This is as good as it will get 
SPLIT aparm(1)=2 0;
7 
 
 
 
 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
PRTAN.LIS
LISTR.LIS
DTSUM_0.LIS
DTSUM_1.LIS
VPLOT.PS
POSSM.PS
UVPLT_UV.PS
UVPLT_UVD.PS
UVPLT_UVPA.PS
SN_ACCOR_AMP_1.PS
SN_ACCOR_AMP_2.PS
SN_APCAL_AMP_1.PS		 SN_APCAL_AMP_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
SN_FRING2_DEL_1.PS
SN_FRING2_DEL_2.PS
SN_FRING2_RAT_1.PS
SN_FRING2_RAT_2.PS
SN_FRING2_SNR_1.PS		 SN_FRING2_SNR_2.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? Yes
Comments on Difmap processing
only a simple fit is possible with 2 GRTs. 2 point sources, or 1 elliptical work equally well. The extension is not along the beam axis. Selfcal on 1, 2 and 3 minute timescale was tried. Two was settled on.

Image
Ampl, Phase vs (u,v) Distance
PS (40 kb)
JPEG (45 kb)
 Ampl, Phase vs Time
PS (90 kb)
JPEG 1, 2		 (u,v) Coverage
PS (21 kb)
JPEG (29 kb)
Closure Phase vs Time
PS (46 kb)
JPEG 1		 Clean Image
PS (29 kb)
JPEG (45 kb)
Modelfit
Ampl, Phase vs (u,v) Distance
PS (40 kb)
JPEG (45 kb)
 Ampl, Phase vs Time
PS (90 kb)
JPEG 1, 2		 (u,v) Coverage
PS (21 kb)
JPEG (29 kb)
Closure Phase vs Time
PS (46 kb)
JPEG 1		 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)
0.111309 0.0991474 -74.6942 0 0 0 0.0000
0.0615639 0.285903 119.998 0 0 0 0.0000
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Thu Aug 26 03:04:41 GMT 2004
by db_results.pl version 0.3.