[daip] BPASS
Adrienne Stilp
adrienne at astro.washington.edu
Thu Oct 2 13:13:40 EDT 2008
Dear Daip,
when running BPASS on HI data taken in Aug08, we found an interesting
problem with soltype 'L1R'. In both 31DEC07 and 31DEC08, using L1R works
fine for FREQID 1, and for LL of FREQID 2. However, for RR in FREQID 2,
the resulting BP table shows amplitudes of some 10s (rather than the usual ~1)
for the first half of the channels for *EVLA* antennas; while the VLA antennas
are very low in those channels (0.1-ish). Phases look reasonable. Using
soltype 'L1' on the same data gives good results for all FREQIDs and STOKES.
Note that we have flagged all EVLA-EVLA baselines, to avoid the aliasing
problem.
The data are on alfirk, as /home/alfirk/LT1/foreric.fits (note that we
ask BPASS to calculate its own Channel 0).
Inputs follow.
Thanks --
Adrienne & Michael, in the ALMA wing, x7221
> inp bpass
AIPS 1: BPASS Task to generate a "Bandpass" (BP) table.
AIPS 1: Adverbs Values Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1: USERID 0 User number
AIPS 1: INNAME '20080804' Input UV file name (name)
AIPS 1: INCLASS 'LINE' Input UV file name (class)
AIPS 1: INSEQ 1 Input UV file name (seq. #)
AIPS 1: INDISK 2 Input UV file disk unit #
AIPS 1:
AIPS 1: Data Selection
AIPS 1: CALSOUR '1331+305' Bandpass calibrator sources.
AIPS 1: *rest ' '
AIPS 1: QUAL -1 Calibrator qualifier -1=>all
AIPS 1: CALCODE ' ' Calibrator code ' '=>all
AIPS 1: UVRANG 0 0 UV range to select
AIPS 1: TIMERANG *all 0 Time range to select
AIPS 1: SELBAND -1 Bandwidth to select (kHz)
AIPS 1: SELFREQ -1 Frequency to select (MHz)
AIPS 1: FREQID 2 Freq. ID to select.
AIPS 1: BIF 0 Lowest IF number 0=>all
AIPS 1: EIF 0 Highest IF number 0=>all
AIPS 1: SUBARRAY 0 Subarray, 0=>all
AIPS 1: ANTENNAS *all 0 Antennas to select
AIPS 1:
AIPS 1: CLEAN map (optional)
AIPS 1: IN2NAME ' ' Cleaned map name (name)
AIPS 1: IN2CLASS ' ' Cleaned map name (class)
AIPS 1: IN2SEQ 0 Cleaned map name (seq. #)
AIPS 1: IN2DISK 0 Cleaned map disk unit #
AIPS 1: INVERS -1 CC file version #.
AIPS 1: NCOMP *all 0 # comps to use for model.
AIPS 1: 1 value per field
AIPS 1: FLUX 0 Lowest CC component used.
AIPS 1: NMAPS 0 No. Clean map files
AIPS 1: CMETHOD ' ' Modeling method:
AIPS 1: 'DFT','GRID',' '
AIPS 1: SMODEL *all 0 Source model, 1=flux,2=x,3=y
AIPS 1: See HELP SMODEL for details.
AIPS 1:
AIPS 1: Control options
AIPS 1: DOCALIB 1 > 0 calibrate data & weights
AIPS 1: > 99 do NOT calibrate weights
AIPS 1: GAINUSE 2 CL table to apply (SN table
AIPS 1: to apply to single-source)
AIPS 1: DOPOL -1 If >0 correct polarization.
AIPS 1: BLVER -1 BL table to apply.
AIPS 1: FLAGVER 1 Flag table version
AIPS 1: DOBAND -1 If >0 apply bandpass cal.
AIPS 1: Method used depends on value
AIPS 1: of DOBAND (see HELP file).
AIPS 1: BPVER 0 Bandpass table version
AIPS 1: SOLINT 0 Solution interval (mins)
AIPS 1: -1 => do whole time range
AIPS 1: SOLTYPE 'L1R' Soln type,' ','L1','GCON',
AIPS 1: 'R', 'L1R', 'GCOR'
AIPS 1: REFANT 22 Reference antenna
AIPS 1: OUTVERS 0 Output BP table version
AIPS 1: 0 => a new table to be
AIPS 1: generated.
AIPS 1: SMOOTH *all 0 Smoothing function.
AIPS 1: BE VERY CAREFUL HERE.
AIPS 1: ANTWT *all 0 Ant. wts (0 => 1.)
AIPS 1: WEIGHTIT 0 Modify data weights function
AIPS 1: MINAMPER 1 Amplitude closure error
AIPS 1: regarded as excessive in %
AIPS 1: MINPHSER 1 Phase closure error regarded
AIPS 1: as excessive in degrees
AIPS 1: BPASSPRM *all 0 Control information:
AIPS 1: 1: if > 0 use only the
AIPS 1: autocorrelation data.
AIPS 1: 2: print level - see help
AIPS 1: 3: If > 0 do not divide data
AIPS 1: by source model
AIPS 1: 4: If > 0 store phases only
AIPS 1: in the BP table. If < 0
AIPS 1: store amplitudes only.
AIPS 1: 5: Divide by 'channel 0'
AIPS 1: **** SEE HELP - NEW ****
AIPS 1: 6: amp closure error limit -
AIPS 1: print channels averaging
AIPS 1: over this if (2) > 0
AIPS 1: 7: phase closure error limit
AIPS 1: print channels averaging
AIPS 1: over this if (2) > 0
AIPS 1: 8: > 0 => scalar average
AIPS 1: 9: > 0 => interpolate over
AIPS 1: flagged channels if poss.
AIPS 1: 10:1 => normalize amplitudes
AIPS 1: using all channels
AIPS 1: 2 => normalize amplitudes
AIPS 1: using ICHANSEL channels
AIPS 1: 3 => normalize amplitudes
AIPS 1: and zero average phase
AIPS 1: using ICHANSEL channels
AIPS 1: 4 => normalize amplitudes
AIPS 1: and zero average phase
AIPS 1: using all channels
AIPS 1: 0 => no deliberate norm.
AIPS 1: 11: > 0 solution weights are
AIPS 1: independent of channel
AIPS 1: = -1 weights scaled
AIPS 1: by amplitude**2
AIPS 1: < -1.5 weights scaled by
AIPS 1: 1 / amplitude**2
AIPS 1: ICHANSEL *all 0 Array of start and stop chan
AIPS 1: numbers, plus a channel
AIPS 1: increment and IF to be used
AIPS 1: to select channels to sum to
AIPS 1: find a 'channel 0'. If all
AIPS 1: 0, range set to inner 75% of
AIPS 1: observing band.
AIPS 1: SPECINDX 0 Spectral index to correct
AIPS 1: 'Channel 0' uv-data
AIPS 1: IN3NAME ' ' Channel 0 uv name (name)
AIPS 1: must be '' to suppress option
AIPS 1: IN3CLASS ' ' Channel 0 uv name (class)
AIPS 1: must be '' to suppress option
AIPS 1: IN3SEQ 0 Channel 0 uv name (seq. #)
AIPS 1: IN3DISK 0 Channel 0 uv disk unit #
AIPS 1: BADDISK *all 0 Disks to avoid for scratch
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