VS02N Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Richard Dodson
Date Prepared: 11-03-2003
 

Summary
 
Observation code : VS02N    AIPS Version : 31DEC00   
Date of Observation : 2002/241    Difmap Version : 2.4a 
Source Name : J0433+05    vsop_difmap used : Yes 
Calibration Source(s) : (J0423-01)         
Ground telescopes : HO  Model Fitted to data : Yes 
Tracking Station(s) : UZ    Image made : Yes 
Correlator : Mitaka         

 
Abstract
Just HO to VSOP. Very weak signal. A single value for the delay is used, and then a delay search. This will cause some signal loss.

Data calibrated with both IF's tied in AIPS to improve signal. Very complicated source, so only VSOP baselines here. Core may be slightly resolved.
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
0.572401 0.00960943 -46.8792 0.200000 1.00000 0.00000 0.6983
(*) 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 
 
 Amplitude calibration solutions applied. Hobart as ref 
CLCAL refant=1;
2 
2 
3 
 
 Amplitude calibration solutions applied. Hobart as ref 
FRING dparm 1,200,200,2,1,0;aparm(7)=0.1;solint
   15,5,10
3 
 
 
3,4,5 
 Good SNR (because of the high gain?), but scattered sols post 23:30. Best solution would be to assume zero rate & -10 nsec delay (equiv to 0.95 signal loss/gain) for whole experiment. Best does not equal good. 
TACOP
3 
 
4 
 
  
CLCOR opcode 'gain';antenna 0;clcorprm
   1.13,0
opcode 'sbdl';antenna 2;clcorprm
   -10,-10,0
opcode 'gain';antenna 0;clcorprm
   1/sqrt(1.13),0
4 
 
4 
 
 Actually applied delay to all and VSOP one more time made a mistake in the correction value. 
FRING dparm 2,-1,200,0.5;solint 5
4 
 
 
6 
 Signal fades out after 00UT. 
SNEDT
 
6 
 
7 
 Smooth the rates (and zero the delays) 
CLCAL opty 'ambg'
4 
7 
5 
 
  
SPLIT aparm(1)=2 0;
5 
 
 
 
 Av within IF 
FITTP
 
 
 
 
 Data written out for analysis in Difmap 

AIPS Input Files
Comments
Fringes not found at correlator post 23:30 UT

AIPS Output Files
DTSUM_1.LIS
PRTAN.LIS
LISTR.LIS
DTSUM_0.LIS
POSSM.PS
VPLOT.PS
UVPLT_UV.PS
UVPLT_UVD.PS
UVPLT_UVPA.PS
SN_ACCOR_AMP_1.PS		 SN_ACCOR_AMP_2.PS
SN_APCAL_AMP_2.PS
SN_APCAL_AMP_1.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_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
IMAGE.FITS


Difmap Data Reduction Notes
Phase selfcal applied? No
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
Calibrated AIPS data base is in J0433_SC_AIPS.FITS, and phase fit combining to IFs is in SN_CALIB_PHA_2.PS

Removed all ground data. Source is too complicated.

About 0.57 Jy in slightly resolved core component

Core size is 0.20 pm 0.08

Image
Ampl, Phase vs (u,v) Distance
PS (17 kb)
JPEG (36 kb)
 Ampl, Phase vs Time
PS (32 kb)
JPEG 1		 (u,v) Coverage
PS (11 kb)
JPEG (24 kb)
Closure Phase vs Time
PS (1 kb)
JPEG 1		 Clean Image
PS (30 kb)
JPEG (74 kb)
Modelfit
Ampl, Phase vs (u,v) Distance
PS (17 kb)
JPEG (36 kb)
 Ampl, Phase vs Time
PS (32 kb)
JPEG 1		 (u,v) Coverage
PS (11 kb)
JPEG (24 kb)
Closure Phase vs Time
PS (1 kb)
JPEG 1		 Image with model components
PS (39 kb)
JPEG (43 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)
0.572401 0.00960943 -46.8792 0.200000 1.00000 0.00000 0.6983
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Mon Oct 10 05:54:22 UTC 2005
by db_results.pl version 0.3.