[daip] SETJY question

[Eric Greisen]

Hanno Spreeuw writes:
 > Hello, I am reprocessing some 1986 P-band VLA data. The fluxscale in the 
 > final image is not right so I am investigating some possible mistakes.
 > I ran SETJY with OPTY 'CALC' on 3C286 and 3C48 and otherwise default values.
 > The fluxes of 3C286 and 3C48 from SETJY are ok.
 > The flux of the phase calibrator, after running GETJY, also matches the 
 > value in the VLA calibrator manual.
 > I was looking at the SU table after running SETJY, CALIB and GETJY 
 > (attached). It seems weird to me that the rest frequencies are not all 
 > the same.

    These are line data with doppler tracking on some sources.  The
offsets are 300 Hz - which is irrelevant for things like Flux.  It is
true that most aips tasks forget that the source (and CL) tables have
added frequency offsets but they are normally small.

Eric Greisen


 > Can you tell from this SU table that something is wrong?
 > Thanks,
 > Hanno.
 >  castor    PRTAB(31DEC07)    140     26-OCT-2007  13:55:42    Page    1
 > STEPBYSTEP  .SPLAT .   7  Disk= 1    SU Table version   1
 > Title: AIPS UV DATA FILE SOURCE TABLE
 > Created by      SPLAT on 25-OCT-2007 16:12:49
 > Last written by SPLAT on 25-OCT-2007 16:12:49
 > Ncol  19  Nrow       5    Sort cols:
 >     Table has     4 keyword-value pairs:
 >    NO_IF    =            1
 >    VELTYP   =  LSR
 >    VELDEF   =  RADIO
 >    FREQID   =           -1
 >    Table can be written as a FITS ASCII table
 > 
 > COL. NO.     1         2       3      4         5          6          7          8            9             10            11
 >      ROW  ID. NO.  SOURCE    QUAL  CALCODE  IFLUX      QFLUX      UFLUX      VFLUX      FREQOFF        BANDWIDTH     RAEPO
 >   NUMBER                                    JY         JY         JY         JY         HZ             HZ            DEGREES
 >        1     1     CYGA        0            1.374E+03  0.000E+00  0.000E+00  0.000E+00   0.000000E+00  9.765625E+04  2.994333E+02
 >        2     2     3C286       0      B     2.579E+01  0.000E+00  0.000E+00  0.000E+00   0.000000E+00  9.765625E+04  2.022069E+02
 >        3     3     SGRA        0            0.000E+00  0.000E+00  0.000E+00  0.000E+00   3.333516E+02  9.765625E+04  2.656312E+02
 >        4     4     1938-155    0      T     1.842E+01  0.000E+00  0.000E+00  0.000E+00   2.969937E+02  9.765625E+04  2.946020E+02
 >        5     5     3C48        0      C     4.286E+01  0.000E+00  0.000E+00  0.000E+00  -2.916622E+02  9.765625E+04  2.370792E+01
 > Type Q to stop, just hit RETURN to continue
 > 
 >  castor    PRTAB(31DEC07)    140     26-OCT-2007  13:55:52    Page    2
 > COL. NO.        12            13            14             15             16             17            18            19
 >      ROW  DECEPO         EPOCH         RAAPP         DECAPP         LSRVEL         RESTFREQ       PMRA          PMDEC
 >   NUMBER  DEGREES        YEARS         DEGREES       DEGREES        M/SEC          HZ             DEG/DAY       DEG/DAY
 >        1   4.058333E+01  1.950000E+03  2.997554E+02   4.068343E+01   0.000000E+00  -2.960205E+05  0.000000E+00  0.000000E+00
 >        2   3.076629E+01  1.950000E+03  2.026278E+02   3.058163E+01  -3.472813E+05  -2.960205E+05  0.000000E+00  0.000000E+00
 >        3  -2.899250E+01  1.950000E+03  2.662155E+02  -2.900973E+01  -7.500000E+04   3.319577E+08  0.000000E+00  0.000000E+00
 >        4  -1.552617E+01  1.950000E+03  2.951263E+02  -1.544175E+01   0.000000E+00  -2.960205E+05  0.000000E+00  0.000000E+00
 >        5   3.290583E+01  1.950000E+03  2.422938E+01   3.309075E+01  -3.472816E+05  -2.960205E+05  0.000000E+00  0.000000E+00
 > AIPS 1: Resumes
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