VS08a Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Shinjii HORIUCHI
Date Prepared: 24-10-2001
 

Summary
 
Observation code : VS08a    AIPS Version : 12DEC00   
Date of Observation : 1999/256    Difmap Version : 2.3c 
Source Name : J0416-1851    vsop_difmap used : Yes 
Calibration Source(s) : 0414-189         
Ground telescopes : KA, MP, HH  Model Fitted to data : Yes 
Tracking Station(s) : GZ    Image made : Yes 
Correlator : Mitaka         

 
Abstract
No space fringes are detected by Mitaka correlator and analyst. One curious thing is GRT amplitude. After gain-tsys calibration using measured tsys for HH and nominal tsys values for Halca, KA, MP, the target source shows remarkably low amplitude about 0.2 Jy with HH,MP,KA baselines (at 120-180 M lambda) while PRS observed 1.5 Jy at 5 M lambda and 1.3 Jy at 120 M lambda. However the calibrator 0414-189 seems rather alright with about 1.4-2.0 Jy from the ground while PRS observed 3.5 Jy at 120 M lambda (the AT flux monitor tells that the total flux of this source has got decreased since the time of PRS). The 'SNR' value provided by FRING in AIPS is about 50 for the target and 250 for the calibrator. Something must be wrong systematically with only target source. Or is this due to variability of the source? If so, the space fringe could not have been detected anyway because space baseline length was more than 220 M lambda in this experiment.

I would suggest that this experiment is to be re-scheduled, but not with very high priority.
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
0.206245 0.0224699 35.2892 0.849231 0.718372 -34.7703 0.0194
(*) 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
 
 
 
 
  
MSORT
 
 
 
 
  
INDXR
 
 
 
 
  
ACCOR
 
1 
 
 
  
CLCAL
1 
1 
2 
 
 SMOTYPE = 'AMPL' 
FRING Solint=6, APARM(7)=2, DPARM=1,2000,
   200, 0, REFANT=2
1 
 
 
2 
 initial trial 
FRING Solint=6, APARM(7)=2, DPARM=1,4000,
   500, 0, REFANT=2
2 
 
 
3 
 with wider search window 
FRING Solint=6, APARM(7)=2, DPARM=1,4000,
   500, 0, REFANT=1
2 
 
 
4 
 with wider search window with Kashima as refant 
ANTAB
 
 
 
 
 TY1, GC1 are generated. 
APCAL
 
 
 
6 
  
CLCAL
2 
6 
3 
 
 SMOTY 'AMPL" 
CLCAL
3 
2 
4 
 
 SMOTY 'VLBI" 
SPLIT
5 
 
 
 
  
FITTP
 
 
 
 
  

AIPS Input Files
Comments
- None -

AIPS Output Files
PRTAN.LIS
LISTR.LIS
DTSUM_0.LIS
DTSUM_1.LIS
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_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
POSSM_AP_1.PS
POSSM_AP_2.PS


Difmap Data Reduction Notes
Phase selfcal applied? Yes
Global amplitude selfcal (gscal) applied? No
Amplitude selfcal on non-global timescales used? Yes
Modelfit made and saved? Yes
Image Made and saved? Yes
Comments on Difmap processing
Data is consistent with a compact point sources as indicated by different ground surveys.

Image
Ampl, Phase vs (u,v) Distance
PS (30 kb)
JPEG (37 kb)
 Ampl, Phase vs Time
PS (136 kb)
JPEG 1, 2		 (u,v) Coverage
PS (16 kb)
JPEG (24 kb)
Closure Phase vs Time
PS (105 kb)
JPEG 1		 Clean Image
PS (29 kb)
JPEG (45 kb)
Modelfit
Ampl, Phase vs (u,v) Distance
PS (30 kb)
JPEG (37 kb)
 Ampl, Phase vs Time
PS (136 kb)
JPEG 1, 2		 (u,v) Coverage
PS (16 kb)
JPEG (24 kb)
Closure Phase vs Time
PS (105 kb)
JPEG 1		 Image with model components
PS (30 kb)
JPEG (37 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)
0.206245 0.0224699 35.2892 0.849231 0.718372 -34.7703 0.0194
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Wed Oct 24 00:20:10 GMT 2001
by db_results.pl version 0.3.