[daip] RUNNING RM synthesis tasks (or getting ready to do so)
Eric Perlman
eperlman at fit.edu
Wed Jun 8 15:25:47 EDT 2016
Hi,
I am trying to do a rotation measure synthesis analysis on some recent
VLBA data. I would like to do it using DOFARS but am having trouble
getting my data ready to do so. I am using AIPS version 31-DEC-2015.
To this point, I have done the following:
1) Run SPLIT (with APARM=0) on the data, which has been polarization
calibrated.
2) Obtained a high-quality self-calibrated Stokes I image, using
multiple iterations of self-cal.
3) Self-calibrated the data with that Stokes I image.
4) Run IMAGR with no cleaning, FREQID=-1 and FQTOL=-1 to create Stokes
Q, U, V images.
This created an image that has a header that looks like this:
AIPS 1: Image=NGC4845 (MA) Filename=NGC4845 .QIM001. 1
AIPS 1: Telescope=VLBA Receiver=VLBA
AIPS 1: Observer=BP191 User #= 1806
AIPS 1: Observ. date=08-OCT-2015 Map date=06-JUN-2016
AIPS 1: Minimum=-3.21130268E-03 Maximum= 2.84131849E-03 JY/BEAM
AIPS 1: ----------------------------------------------------------------
AIPS 1: Type Pixels Coord value at Pixel Coord incr Rotat
AIPS 1: RA---SIN 1024 12 58 01.197 512.00 -0.000300 0.00
AIPS 1: DEC--SIN 1024 01 34 32.420 513.00 0.000300 0.00
AIPS 1: FREQ 128 4.8520000E+09 1.00 2.5000000E+05 0.00
AIPS 1: STOKES 1 2.0000000E+00 1.00 1.0000000E+00 0.00
AIPS 1: ----------------------------------------------------------------
AIPS 1: Coordinate equinox 2000.00
AIPS 1: Map type=DIRTY Number of iterations= 0
AIPS 1: Conv size= 0.00296 X 0.00126 Position angle= 0.61
AIPS 1: Rest freq 4852.000 Vel type: OPTICAL wrt YOU
AIPS 1: Alt ref. value 0.00000E+00 wrt pixel 1.00
AIPS 1: Maximum version number of extension files of type CG is 1
AIPS 1: Maximum version number of extension files of type HI is 1
AIPS 1: Keyword = 'WTNOISE ' value = 1.19735482D+00
AIPS 1: Keyword = 'SUMWTIN ' value = 4.81890338D+00
AIPS 1: Keyword = 'OLDRFQ ' value = 4.85200000D+09
AIPS 1: Keyword = 'CORRELAT' value = 'DIFX '
AIPS 1: Keyword = 'MAXABSU ' value = -1.000000E+00
When I try to run FQUBE the following error messages appear:
LOCALH> FQUBE1: Task FQUBE (release of 31DEC15) begins
LOCALH> FQUBE1: NGC4845 .QIM001. 2 MA 1806 NOT FOUND
LOCALH> FQUBE1: NGC4845 .QIM001. 3 MA 1806 NOT FOUND
LOCALH> FQUBE1: NGC4845 .QIM001. 4 MA 1806 NOT FOUND
LOCALH> FQUBE1: NGC4845 .QIM001. 5 MA 1806 NOT FOUND
LOCALH> FQUBE1: ZCREAT: INVALID BYTE REQUEST = 0
LOCALH> FQUBE1: ZCREAT ERROR 4 FOR NGC4845 .FQUBE . 1
LOCALH> FQUBE1: Purports to die of UNNATURAL causes
If I try to explicitly tell FQUBE to use the FREQ axis in the image
(with IN2SEQ=INSEQ) I get:
LOCALH> FQUBE1: quasar 31DEC15 TST: Cpu= 0.1 Real= 1
IO= 2
LOCALH> FQUBE1: Task FQUBE (release of 31DEC15) begins
LOCALH> FQUBE1: ZCREAT: INVALID BYTE REQUEST = 0
LOCALH> FQUBE1: ZCREAT ERROR 4 FOR NGC4845 .FQUBE . 1
LOCALH> FQUBE1: Purports to die of UNNATURAL causes
Trying to use MCUBE by itself runs successfully but creates:
LOCALH> MCUBE1: Task MCUBE (release of 31DEC15) begins
LOCALH> MCUBE1: Create NGC4845 .MCUBE . 1 (MA) on disk 2 cno 79
LOCALH> MCUBE1: Map plane does not fit into output map.
LOCALH> MCUBE1: Skipping sequence # 1
LOCALH> MCUBE1: Blanking empty output plane 1
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LOCALH> MCUBE1: Appears to have ended successfully
Even with DOCONCAT=2 it seems to not create an image that has a FQID
axis. Can you help me?
Thanks,
Eric
--
Eric S. Perlman, Professor eperlman at fit.edu
Physics and Space Sciences Department Phone: +1 321 674 7741
Florida Institute of Technology Fax: +1 321 674 7482
150 West University Boulevard http://my.fit.edu/~eperlman
Melbourne, FL 32901 http://astro.fit.edu/
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