[daip] WSRT/AIPS
Shea D. Brown
brown at astro.umn.edu
Mon Feb 9 11:59:51 EST 2009
Hello Eric (or others),
Larry and I have run into a very strange problem when making images of
WSRT data with IMAGR. It seems that the WSRT images are distorted in a
strange way (it does NOT look like the frequency is wrong). I've included
a WSRT image made with IMAGR (the inputs are below), and the same field
from skyview NVSS and the WENSS survey (made with WSRT). NVSS and WENSS
agree, but the WSRT image does not? If you have any ideas as to what is
going on, that would be most helpful. Thanks, and I hope all is going
well.
Shea Brown
Department of Astronomy
University of Minnesota
AIPS 1: IMAGR: Wide field imaging/Clean task
AIPS 1: Adverbs Values Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1: INNAME 'IF8CH114' Input UV data (name)
AIPS 1: INCLASS 'UV' Input UV data (class)
AIPS 1: INSEQ 5 Input UV data (seq. #)
AIPS 1: INDISK 7 Input UV data disk drive #
AIPS 1: SOURCES 'COMA_SE' Source name
AIPS 1: *rest ' '
AIPS 1: QUAL -1 Calibrator qualifier -1=>all
AIPS 1: CALCODE ' ' Calibrator code ' '=>all
AIPS 1: TIMERANG *all 0 Time range to use
AIPS 1: SELBAND -1 Bandwidth to select (kHz)
AIPS 1: SELFREQ -1 Frequency to select (MHz)
AIPS 1: FREQID -1 Freq. ID to select.
AIPS 1: SUBARRAY 0 Sub-array, 0=>all
AIPS 1: ANTENNAS *all 0 Antennas to plot
AIPS 1: BASELINE *all 0 Baselines with ANTENNAS
AIPS 1: DOCALIB 1 > 0 calibrate data & weights
AIPS 1: > 99 do NOT calibrate weights
AIPS 1: GAINUSE 2 CL (or SN) table to apply
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: DOPOL 1 If >0.5 correct polarization.
AIPS 1: BLVER -1 BL table to apply.
AIPS 1: FLAGVER 1 Flag table version
AIPS 1: DOBAND -1 If >0.5 apply bandpass cal.
AIPS 1: Method used depends on value
AIPS 1: of DOBAND (see HELP file).
AIPS 1: BPVER -1 Bandpass table version
AIPS 1: SMOOTH *all 0 Smoothing function. See
AIPS 1: HELP SMOOTH for details.
AIPS 1: STOKES 'V' Stokes parameters (see HELP)
AIPS 1: BCHAN 0 Low freq. channel 0 for cont.
AIPS 1: ECHAN 0 Highest freq channel
AIPS 1: CHANNEL 0 Restart channel number
AIPS 1: NCHAV 1 Number of chan. to average.
AIPS 1: CHINC 1 Channel incr. between maps.
AIPS 1: BIF 0 First IF in average.
AIPS 1: EIF 0 Last IF in average.
AIPS 1: OUTNAME ' ' Output image name (name)
AIPS 1: OUTDISK 7 Output image disk drive #
AIPS 1: OUTSEQ 0 Output seq. no.
AIPS 1: OUTVER 0 CC ver. no (Continuum only)
AIPS 1: *** SET OUTVER ON RESTARTS
AIPS 1: IN2NAME ' ' UV work file name
AIPS 1: IN2CLASS ' ' UV work file class
AIPS 1: IN2SEQ 0 UV work file seq
AIPS 1: *** SET TO KEEP WORK FILE
AIPS 1: IN2DISK 0 UV work file disk
AIPS 1: CELLSIZE 15 15 (X,Y) size of grid in asec
AIPS 1: IMSIZE 1024 1024 Minimum image size
AIPS 1: NFIELD 1 Number of fields (max 4096)
AIPS 1: DO3DIMAG -1 > 0 => use different tangent
AIPS 1: points for each field
AIPS 1: FLDSIZE *all 0 Clean size of each field.
AIPS 1: RASHIFT *all 0 RA shift per field (asec)
AIPS 1: DECSHIFT *all 0 DEC shift per field (asec)
AIPS 1: UVTAPER 0 0 (U,V) Gaussian taper
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: units are kilo-lambda
AIPS 1: UVRANGE 0 0 Min & max baseline (klambda)
AIPS 1: GUARD 0 0 x,y guard band fractional
AIPS 1: radius
AIPS 1: ROTATE 0 Rotate image CCW from N by
AIPS 1: ROTATE degrees
AIPS 1: ZEROSP *all 0 0-spacing fluxes and weights
AIPS 1: SEE HELP!!
AIPS 1: UVWTFN ' ' UV dist. weight function
AIPS 1: UVSIZE 0 0 Array size for doing uniform
AIPS 1: weights. 0 -> actual field
AIPS 1: size.
AIPS 1: ROBUST 0 Robustness power: -5 -> pure
AIPS 1: uniform weights, 5 => natural
AIPS 1: UVBOX 0 Additional rows and columns
AIPS 1: used in weighting.
AIPS 1: UVBXFN 1 Box function type when UVBOX
AIPS 1: > 0. 0 -> 1 round pill box.
AIPS 1: XTYPE 5 Conv. function type in x
AIPS 1: default spheroidal
AIPS 1: YTYPE 5 Conv. function type in y
AIPS 1: default spheroidal
AIPS 1: XPARM *all 0 Conv. function parms for x
AIPS 1: YPARM *all 0 Conv. function parms for y
AIPS 1: NITER 10000 Maximum # of Clean components
AIPS 1: BCOMP *all 0 Begin at BCOMP component
AIPS 1: Specify for each field.
AIPS 1: ALLOKAY 0 For restart: > 0 => beams
AIPS 1: okay, > 1 => work file too
AIPS 1: NBOXES 0 Number of boxes for Clean
AIPS 1: NB: field 1 only.
AIPS 1: CLBOX *all 0 Four coordinates for each box
AIPS 1: BOXFILE *all ' ' Input file of field params
AIPS 1: and Clean boxes; ' ' => use
AIPS 1: FLDSIZE, RASHIFT, DECSHIFT,
AIPS 1: NBOXES, CLBOX only.
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: OBOXFILE *all ' ' Output file for final Clean
AIPS 1: boxes
AIPS 1: GAIN 0.05 Clean loop gain
AIPS 1: FLUX 0 Minimum Clean component (Jy)
AIPS 1: MINPATCH 51 Min. BEAM half-width in AP.
AIPS 1: BMAJ 60 FWHM(asec) major axis Clean
AIPS 1: restoring beam.
AIPS 1: BMIN 60 FWHM(asec) minor axis Clean
AIPS 1: restoring beam.
AIPS 1: BPA 0 Clean beam position angle
AIPS 1: OVERLAP 0 1 => restore components to
AIPS 1: overlapped fields, >=2=>
AIPS 1: expect overlaps in Cleaning
AIPS 1: PHAT 0 Prussian hat height.
AIPS 1: FACTOR 0 Speedup factor see HELP
AIPS 1: CMETHOD ' ' Modeling method:
AIPS 1: 'DFT','GRID',' '
AIPS 1: IMAGRPRM *all 0 Task enrichment parameters
AIPS 1: (1) Antenna diameter (m)
AIPS 1: (2) Source Spectral index
AIPS 1: (3) Frequency scaling factor
AIPS 1: (4) > 0 -> SDI Clean factor
AIPS 1: (5) >0 => scale residuals
AIPS 1: (6) Half-width in x of box
AIPS 1: (7) Half-width in y of box
AIPS 1: (8) Filter components whose
AIPS 1: neighborhood is weaker than
AIPS 1: IMAGRPRM(8) Jy. 0 -> don't
AIPS 1: (9) Radius in pixels for the
AIPS 1: IMAGRPRM(8) test.
AIPS 1: (10) multiplier of image size
AIPS 1: to get beam size: 0 => 2;
AIPS 1: 2, 1, 0.5 0.25 supported
AIPS 1: (11-16) Multi-resolution
AIPS 1: added controls
AIPS 1: (17) spectral index radius
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: 0 -> no correction
AIPS 1: (19) Dynamic range limit
AIPS 1: (20) Retry factor (see help)
AIPS 1: NGAUSS 0 Number of resolutions to use
AIPS 1: WGAUSS *all 0 Resolutions in arc sec >= 0
AIPS 1: FGAUSS *all 0 Minimum flux for each resol.
AIPS 1: MAXPIXEL 30000 Maximum pixels searched in
AIPS 1: each major cycle.
AIPS 1: IN3NAME ' ' Spectral index image name
AIPS 1: IN3CLASS ' ' Spectral index image class
AIPS 1: IN3SEQ 0 Spectral index image sequence
AIPS 1: number
AIPS 1: IN3DISK 0 Spectral index image disk
AIPS 1: IN4NAME ' ' Spectral curvature name
AIPS 1: IN4CLASS ' ' Spectral curvature class
AIPS 1: IN4SEQ 0 Spectral curvature sequence
AIPS 1: number
AIPS 1: IN4DISK 0 Spectral curvature disk
AIPS 1: FQTOL -1 Frequency tolerance in kHz
AIPS 1: (primary beam & spec index)
AIPS 1: DOTV -1 Display residuals on TV ?
AIPS 1: Start with field = DOTV
AIPS 1: GRCHAN 0 Graphics channel of boundary
AIPS 1: BADDISK *all 0 Disks to avoid for scratch.
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