VS04M Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Richard Dodson
Date Prepared: 01-12-2003
 

Summary
 
Observation code : VS04M    AIPS Version : 31DEC03   
Date of Observation : 1999/134    Difmap Version : 2.4a 
Source Name : J1837-7108    vsop_difmap used : Yes 
Calibration Source(s) : 2255-282         
Ground telescopes : HH HO MP  Model Fitted to data : Yes 
Tracking Station(s) : UZ    Image made : Yes 
Correlator : Penticton         

 
Abstract
Modelled as a triple. But the HH amp changes are at the same time for the two IFs. That screams pointing to me.

Did a combine IF AIPS solution. Data in J1837-71_AIPS.UVF

Reasonable image and model. Very little vsop detection, but probably okay, i.e. source is really resolved?
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
1.36926 0.0589149 130.782 0.598691 0.500000 -15.5785 0.3728
0.504426 0.664836 -1.08474 0.408003 1.00000 69.7686 0.1479
(*) 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. HH as ref 
CLCOR opcode 'gain';antenna 0;clcorprm
   1.19,0
2 
 
2 
 
  
FRING docal -1; dparm 2,0,0,0.5,0;aparm(7)=0.1;solint
   5,10,15
 
 
 
2,3,4,5 
 Full range searched. Brief VSOP fringes at start 
TACOP/SNCOR ant 3 0;
 
5 
 
6 
 zero VSOP sols 
CLCAL refant=1;
2 
5 
3 
 
  
CLCAL refant=1;
2 
6 
4 
 
  
KRING cparm 0.5,0,0,0.1,0;solint
    10/5; cparm 0.5 20 10;gainu
   4
 
 
 
7,8,9 
 Still no VSOP after the break in data 
SPLIT aparm(1)=2 0;
3 
 
 
 
 Av within IF. No cal source? 2255-282 
FITTP
 
 
 
 
 Data written out for analysis in Difmap 

AIPS Input Files
ANTAB.TXT Comments
Used nominal_tsys.pl

AIPS Output Files
PRTAN.LIS
LISTR.LIS
DTSUM_0.LIS
DTSUM_1.LIS
UVPLT_UV.PS
UVPLT_UVD.PS
UVPLT_UVPA.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? 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
Straight forward. Fitted the amplitude change in Harts, but I am not convinced by it.

Reselfcaled in AIPS, perhaps some VSOP signal

Reasonable model and fit. Little VSOP power, but that's probably okay. source is really resolved?

Image
Ampl, Phase vs (u,v) Distance
PS (56 kb)
JPEG (42 kb)
 Ampl, Phase vs Time
PS (153 kb)
JPEG 1, 2		 (u,v) Coverage
PS (30 kb)
JPEG (28 kb)
Closure Phase vs Time
PS (107 kb)
JPEG 1		 Clean Image
PS (31 kb)
JPEG (48 kb)
Modelfit
Ampl, Phase vs (u,v) Distance
PS (56 kb)
JPEG (42 kb)
 Ampl, Phase vs Time
PS (152 kb)
JPEG 1, 2		 (u,v) Coverage
PS (30 kb)
JPEG (28 kb)
Closure Phase vs Time
PS (107 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)
1.36926 0.0589149 130.782 0.598691 0.500000 -15.5785 0.3728
0.504426 0.664836 -1.08474 0.408003 1.00000 69.7686 0.1479
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Tue Oct 11 09:07:22 UTC 2005
by db_results.pl version 0.3.