VS01b Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Matt Lister
Date Prepared: 14-04-1999
 

Summary
 
Observation code : VS01b    AIPS Version : 15APR99   
Date of Observation : 1997/356    Difmap Version : 2.3c 
Source Name : 3C273    vsop_difmap used : Yes 
Calibration Source(s) :          
Ground telescopes : SC,NL,LA,BR  Model Fitted to data : Yes 
Tracking Station(s) : RZ, NZ    Image made : Yes 
Correlator : Socorro         

 
Abstract
Had to average up channels using SPLAT to find (weak) space fringes Rather odd jumps in delay solutions for HALCA throughout the experiment. (+/- 100 ns)
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
4.83509 0.549277 -144.676 0.982573 0.574683 50.8704 0.4253
(*) 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 douvcomp = 1; clint = 0.25
digicor = 1; delcorr = 1
 
 
 
 
  
INDXR cparm = 0, 0, 0.25
 
 
1 
 
  
OBTAB aparm = 1,0
 
 
 
 
  
UVFLG infil = 'uvflg.txt'
 
 
 
 
  
ACCOR solint = 5
1 
 
2 
1 
  
ANTAB
 
 
 
 
 VLBA gain file and TSYS data from aspen used. SC gain adjusted to compensate for switch of baseband frequency circa Dec 97. (see ANTAB.TXT) 
APCAL
2 
 
3 
2 
  
FRING docalib = 1
gainuse = 3
dofit = ground antennas only
solint = 5
dparm = 3,600,100,0
cparm = 2,0,0,0,0,1,5,0,1,0
3 
 
4 
3 
  
SPLAT aparm 3,0; channel 8; solint
   4
 
 
 
 
 Averaged in time and channels, applying ground solutions 
CLCOR opcode 'cloc'
1 
 
2 
 
 applied to SPLAT file NZ delay of -265ns 
FRING docalib = 1
gainuse = 1
solint = 3
dparm = 3,50,10,4,0
cparm = 2,0,0,0,0,1,4.5,0,1,0
2 
 
3 
1 
 did FFT fit only to give SN 1; CL 2, then LLS to give SN2;CL3 
SPLIT aparm 2,0,1; gainuse 3
 
 
 
 
 ran on SPLAT file 
FITTP
 
 
 
 
 Data written out for analysis in Difmap 

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

Additional Files
NameDescription
VS01b_lister_TASAV2.FITSThe table files from the SPLAT file
radplot.psradplot from DIFMAP
tplot.pstplot from DIFMAP

AIPS Output Files
DTSUM_1.LIS
PRTAN.LIS
LISTR.LIS
SN_FRING1_DEL_1.PS
SN_APCAL_AMP_1.PS
SN_APCAL_AMP_2.PS
SN_FRING2_SNR_2.PS
SN_FRING1_RAT_1.PS		 SN_FRING1_RAT_2.PS
SN_FRING2_DEL_2.PS
SN_FRING2_RAT_1.PS
SN_FRING2_RAT_2.PS
SN_ACCOR_AMP_1.PS
SN_FRING1_DEL_2.PS
SN_FRING1_SNR_1.PS
SN_FRING1_SNR_2.PS		 SN_ACCOR_AMP_2.PS
SN_FRING2_DEL_1.PS
POSSM01_AP_1.PS
SN_FRING2_SNR_1.PS
UVPLT_UV.PS


Difmap Data Reduction Notes
Phase selfcal applied? Yes
Global amplitude selfcal (gscal) applied? Yes
Amplitude selfcal on non-global timescales used? Yes
Modelfit made and saved? Yes
Image Made and saved? Yes
Comments on Difmap processing
A simple one-component model was fit to the self-calibrated data.

Image
Ampl, Phase vs (u,v) Distance
PS (66 kb)
JPEG (50 kb)
 Ampl, Phase vs Time
PS (438 kb)
JPEG 1, 2, 3, 4		 (u,v) Coverage
PS (35 kb)
JPEG (29 kb)
Closure Phase vs Time
PS (562 kb)
JPEG 1, 2, 3		 Clean Image
PS (96 kb)
JPEG (47 kb)
Modelfit
Ampl, Phase vs (u,v) Distance
PS (66 kb)
JPEG (50 kb)
 Ampl, Phase vs Time
PS (436 kb)
JPEG 1, 2, 3, 4		 (u,v) Coverage
PS (35 kb)
JPEG (29 kb)
Closure Phase vs Time
PS (562 kb)
JPEG 1, 2, 3		 Image with model components
PS (113 kb)
JPEG (47 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)
4.83509 0.549277 -144.676 0.982573 0.574683 50.8704 0.4253
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Thu Nov 30 01:07:15 GMT 2000
by db_results.pl version 0.3.