| VS03l Results
Submitted checklist.txt and checklist.tex is also available |
[Summary | AIPS | Difmap ] |
| Observation code | : | VS03l | AIPS Version | : | 15OCT98 |
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| Date of Observation | : | 1998/53 | Difmap Version | : | 2.3c | |||
| Source Name | : | J1626-29 | vsop_difmap used | : | Yes | |||
| Calibration Source(s) | : | 1622-253 | ||||||
| Ground telescopes | : | HO, SH, HH | Model Fitted to data | : | Yes | |||
| Tracking Station(s) | : | TZ | Image made | : | Yes | |||
| Correlator | : | Penticton |
| Abstract
Checklist changed. No answer to UVPLT_UVPA question and wrong task name format for TBOUT/TBIN in AIPS section. JEJL 27-Nov-2000 |
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| FITLD | DIGICOR=DELCOR=-1 |
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Output file name = VS03L.FITLD |
| MSORT |
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Input file name = VS03L.FITLD, Output file name = VS03L.UVSRT | |
| FIXWT | CPARM(1)=3 CPARM(3)=0.25 = Cl table time interval |
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Input file name = VS03L.UVSRT, Output file name = VS03L.FIXWT |
| OBTAB |
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Not Used | |
| TBOUT |
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Changed entries in AN(1) for MNTSTA by externally editting the table. Changed VSOP_SC from 3 to 2, Hobart from 2 to 0, Hart from 1 to 0. | |
| IBLED |
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Editted out Ho data before 1600 UT. Edits stored in FG(1). | |
| ACCOR |
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Not Used | |
| ANTAB |
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INFILE='CAL:VS03L_CAL.DAT'. Output sent to TY(1) and GC(1). Nominal values were used for the DPFU of Ho (0.4). For Halca, used a nominal Tsys value of 95K. | |
| APCAL |
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Input: Ty(1) + GC(1) | |
| SNSMO |
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Did not use | |
| CLCAL | OPCODE = CALI INTERPOL = 2PT |
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| TACOP |
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| CLCOR | OPCODE='SBDL' ANTENNAS = 2 (Hobart) CLCORPRM= -2525, -2525 GAINVER=3 |
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| CLCOR | OPCODE='SBDL' ANTENNAS = 1 (Hart) CLCORPRM= -2085, -2085 GAINVER=3 |
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| FRING | APARM(1)=2 APARM(7)=3 (SNR=3) APARM(9)=1 DPARM(1)=1 (no baseline stacking) DPARM(2)=500 (500ns delay window) DPARM(3)=100 (100mHz rate window) DPARM(4)=0.5 (0.5 sec integration time) DPARM(6)=1 (don't average in frequency) BCHAN 0, ECHAN 0 SEARCH 3,1,2,4 REFANT 3 (Shanghaii) |
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These are the standard parameters I used (unless otherwise specified). Note: SN(2) was deleted after every trial of FRING except the last (final) trial. |
| FRING | Standard+ SOLINT=4 TIMER 0 23 0 0 0 23 30 0 DPARM(5)=1 only do FFT solution DOCALIB 1, GAINUSE 3 |
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Got good solutions. Abs(rate) was less than 100mHz. Abs(delay) was less than 100ns (except two Hh-Halca solutions). |
| FRING | Standard+ SOLINT=10 TIMER 1 0 30 0 1 1 0 0 DPARM(5)=1 only do FFT solution DOCALIB 1, GAINUSE 3 |
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Couldn't get Halca solutions in range were DQA1 didn't get them. |
| FRING | Standard+ SOLINT=2 TIMER 1 0 30 0 1 1 0 0 DPARM(5)=1 only do FFT solution DOCALIB 1, GAINUSE 3 |
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Still couldn't get non-DQA1 Halca solutions. Give up. |
| FRING | Standard+ SOLINT 3 APARM(7)=SNR=2 (Can edit out bad solns later) DPARM(3)=200 DPARM(2)=200 |
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Got Halca solns Penticton got. |
| SNEDT |
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Editted inconsistent delays and rates. Very few rates were editted, since it was unclear what rates were good/bad solutions. | |
| CLCAL | OPCODE='CALI' INTERPOL = '2PT' |
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| CALIB |
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Not used...SOLINT for FRING=180sec will be comparable to UV averaging time (60sec). Also, noise in phases was very high, impossible to tell if there was phase coherence/decoherance on scales less than 1 min. | |
| TACOP |
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| CLCOR | ANTENNAS=0 OPCODE=GAIN CLCORPRM=0.9055 GAINVER=5 |
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| TASAV |
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Input file: VS03L.FIXWT, Output file: VS03L.TABLES | |
| SPLIT | SOURCES 'J1626-29' BCHAN 0, ECHAN 0 DOCALIB 1, GAINUSE 5 APARM(1)=2 (average each IF separately) APARM(2)=0.5 APARM(4)=1 |
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Input file: VS03L.FIXWT, Output file: J1626-29.FITS |
| FITTP |
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Input file: VS03L.FITS, Output file: FITS:J1626-29.FITS ------------------------------------------------------------------------- |
AIPS Input Files
| ANTAB.TXT INDXR.TXT |
Comments - None - |
Additional Files
| Name | Description |
| image.ps.gz | The final Difmap image (gzipped). |
AIPS Output Files
| Phase selfcal applied? | Yes |
| Global amplitude selfcal (gscal) applied? | Yes |
| Amplitude selfcal on non-global timescales used? | No |
| Modelfit made and saved? | Yes |
| Image Made and saved? | Yes |
| Comments on Difmap processing
Ran uvaver 30,true (averaged over 30 seconds and redo the weights). Cleaning/Phase self-cal: Cleaned out central component, then ran UV taper (0.5 at 100Mlambda), to bring up the short-spacing flux, then removed UVtaper. Made a map without amplitude self-cal, then continued on with amplitude self-cal. I think I believe the map with amp self-cal more, since the gscale corrections did not seem to be too unreasonable. Cleaning/Phase+Amp self-cal: Gscale corrections: IF 1: HARTRAO 0.90 HOBART 1.17 SESHAN25 1.06 VSOP_SC 0.89. IF 2: HARTRAO 0.88 HOBART 1.21 SESHAN25 1.11 VSOP_SC 0.88. Corrections after Gscale were small. Used a very large solint for further amp+phase self-cal since there was only the minimum of 4 antennas to constrain the amp self-cal. Only two iterations of amp+phase self-cal were made. Final residual map had an RMS of 1.6 mJy. Final image: Source was resolved out with clean components along an East-West axis. Core was 0.479Jy/beam. |
| Image | ||||
| Ampl, Phase vs (u,v) Distance PS (21 kb) JPEG (37 kb) |
Ampl, Phase vs Time PS (108 kb) JPEG 1, 2 |
(u,v) Coverage PS (11 kb) JPEG (24 kb) | Closure Phase vs Time PS (95 kb) JPEG 1 |
Clean Image PS (38 kb) JPEG (43 kb) |
| Modelfit | ||||
| Ampl, Phase vs (u,v) Distance PS (21 kb) JPEG (37 kb) |
Ampl, Phase vs Time PS (107 kb) JPEG 1, 2 |
(u,v) Coverage PS (11 kb) JPEG (24 kb) | Closure Phase vs Time PS (94 kb) JPEG 1 |
Image with model components PS (38 kb) JPEG (40 kb) |
More details on the Images and Modelfits are found in this page.
