VS01h Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: William Scott
Date Prepared: 17-12-2000
 

Summary
 
Observation code : VS01h    AIPS Version : 15Apr99   
Date of Observation : 1997/332    Difmap Version : 2.3c 
Source Name : 2134+004    vsop_difmap used : Yes 
Calibration Source(s) :          
Ground telescopes : Mp, Ho, Ud  Model Fitted to data : Yes 
Tracking Station(s) : TZ    Image made : Yes 
Correlator : Penticton         

 
Abstract
Penticton data extraction from GOT experiment V101f. Small spacing amplitudes from the AT light curves and PLS data indicate that the visibilities should be multiplied by a factor of about 1.9. This factor (of 1.9) has NOT been applied to the data. Final image had a jet extending to the west. This was consistent with the Kellerman 2cm images in 95', 96, and 99'. However, the jet was in the opposite direction in the USNO 2 and 8cm images from '94!
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
0.454280 0.0787131 159.903 0 0 0 0.0000
2.29254 1.94829 -100.435 0.786723 1.00000 -20.1707 0.1808
2.97282 2.26272 -117.806 3.34362 0.135162 -12.2037 0.0960
(*) 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 DIGICOR=DELCOR=-1
 
 
 
 
 Output file name = VS01H.FITLD 
MSORT
 
 
 
 
 Input file name = VS01H.FITLD, Output file name = VS01H.UVSRT 
FIXWT
 
 
 
 
 Not done. 
INDXR CPARM(1)=3
CPARM(2)=60
CPARM(3)=0.25
 
 
 
 
 Created NX(1) 
ANTAB
 
 
 
 
 For Ho used a nominal SEFD of 1200. For Halca used a Tsys of 94K, 98K. For Mp, did not have Tsys values in the extracted timerange, but Tsys outside of the timerange was approx. constant, about 38K. Got actual Ud Tsys measurements from the ISAS web page. 
APCAL
 
1 
 
 
 Input: Ty(1) + GC(1) 
CLCAL OPCODE = CALP
INTERPOL = '2PT'
REFANT 8
1 
1 
2 
 
  
TBOUT INEXT = 'AN'
 
 
 
 
  
TBIN
 
 
 
 
 Changed MNTSTA entries in the AN table. Changed Halca from 3 to 2, and changed all other antennas to 0. 
TBIN
 
 
 
2 
 Read in DQA1 delay and rate solutions. 
SNEDT
 
2 
 
3 
 Extremely minor editting of a few discrepant DQA1 solutions. 
CLCAL OPCODE = CALP
INTERPOL = 'AMBG'
REFANT 8 (Ud)
2 
3 
3 
 
  
FRING DOCALIB 1
GAINUSE 3
TIMER 0
SOLINT 2
REFANT 8 (Usuda 64m)
SEARCH 4,3
APARM(1)=2
APARM(7)=1 (SNR=1)
DPARM(1)=3 (include baseline
   stacking)
DPARM(2)=20 (20 ns delay
   window)
DPARM(3)=10 (10mHz rate
   window)
DPARM(4)=0.5
DPARM(5)=0
DPARM(6)=1
3 
 
 
4 
 Solutions looked great. 
SNEDT
 
4 
 
5 
 Minor editting. 
CLCAL OPCODE='CALP'
INTERPOL = 'AMBG'
SMOTYPE = ''
REFANT 8
3 
5 
4 
 
  
TACOP
4 
 
5 
 
  
CLCOR OPCODE 'GAIN'
ANTENNAS 0
CLCORPRM 0.9055
5 
 
5 
 
 Correction for Van Vleck normalization. 
SPLIT SOURCES '2134+004'
DOCALIB 1, GAINUSE 5
5 
 
 
 
 Input file: VS01H.UVSRT, Output file: 2134+004.FITS 
FITTP
 
 
 
 
 Input file: 2134+004.FITS, Output file: 2134+004.FITS amplitude 

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

AIPS Output Files
DTSUM_0.LIS
DTSUM_1.LIS
LISTR.LIS
PRTAN.LIS
POSSM01_AP_1.PS
POSSM02_AP_1.PS
POSSM03_AP_1.PS
SN_APCAL_AMP_1.PS		 SN_APCAL_AMP_2.PS
SN_CALIB_DEL_1.PS
SN_CALIB_DEL_2.PS
SN_CALIB_PHA_1.PS
SN_CALIB_PHA_2.PS
SN_CALIB_RAT_1.PS
SN_CALIB_RAT_2.PS
SN_CALIB_SNR_1.PS		 SN_CALIB_SNR_2.PS
UVPLT_UV.PS
UVPLT_UVD.PS
UVPLT_UVPA.PS
VPLOT_AP_1.PS
VPLOT_AP_2.PS
WEIGHTS.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
Ran phase self-cal until I had a good model, then tried gscale to see if the relative antenna amplitudes were ok. The gscale corrections were all less than 10 percent (Ho 0.91, Mp 1.03, Halca 1.06, Ud 1.09). DID NOT APPLY THESE CORRECTIONS. Final image had a jet extending to the west. This was consistent with the Kellerman 2cm images in 95', 96, and 99'. However, the jet was in the opposite direction in the USNO 2 and 8cm images from '94! Even though my jet extended to the west, could not get rid of one residual to the east as I was cleaning. This residual did not seem to be a sidelobe, so I bit the bullet and added it in, although in the end it's contribution to the final image was in the noise anyhow.

Image
Ampl, Phase vs (u,v) Distance
PS (56 kb)
JPEG (40 kb)
 Ampl, Phase vs Time
PS (161 kb)
JPEG 1, 2		 (u,v) Coverage
PS (28 kb)
JPEG (27 kb)
Closure Phase vs Time
PS (123 kb)
JPEG 1		 Clean Image
PS (58 kb)
JPEG (50 kb)
Modelfit
Ampl, Phase vs (u,v) Distance
PS (56 kb)
JPEG (42 kb)
 Ampl, Phase vs Time
PS (162 kb)
JPEG 1, 2		 (u,v) Coverage
PS (28 kb)
JPEG (27 kb)
Closure Phase vs Time
PS (123 kb)
JPEG 1		 Image with model components
PS (50 kb)
JPEG (44 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)
0.454280 0.0787131 159.903 0 0 0 0.0000
2.29254 1.94829 -100.435 0.786723 1.00000 -20.1707 0.1808
2.97282 2.26272 -117.806 3.34362 0.135162 -12.2037 0.0960
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Wed Aug 25 07:22:32 GMT 2004
by db_results.pl version 0.3.