; CXPOLN ;--------------------------------------------------------------- ;# PROCEDURE VLBI ;! Procedure to make complex poln. images and beam. ;----------------------------------------------------------------------- ;; Copyright (C) 1995, 2005 ;; Associated Universities, Inc. Washington DC, USA. ;; ;; This program is free software; you can redistribute it and/or ;; modify it under the terms of the GNU General Public License as ;; published by the Free Software Foundation; either version 2 of ;; the License, or (at your option) any later version. ;; ;; This program is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; ;; You should have received a copy of the GNU General Public ;; License along with this program; if not, write to the Free ;; Software Foundation, Inc., 675 Massachusetts Ave, Cambridge, ;; MA 02139, USA. ;; ;; Correspondence concerning AIPS should be addressed as follows: ;; Internet email: aipsmail@nrao.edu. ;; Postal address: AIPS Project Office ;; National Radio Astronomy Observatory ;; 520 Edgemont Road ;; Charlottesville, VA 22903-2475 USA ;----------------------------------------------------------------------- CXPOLN LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC CXPOLN: Procedure to make complex poln. images and beam. Use RUN CXPOLN first INNAME UV file name (name) INCLASS UV file name (class) INSEQ 0.0 9999.0 UV file name (seq. #) INDISK 0.0 9.0 UV file disk drive # OUTNAME Output Image name OUTSEQ 1.0 9999.0 Output sequence number OUTDISK 1.0 9.0 Output disk BIF 0.0 100.0 Lowest IF number 0=>all EIF 0.0 100.0 Highest IF number 0=>all BCHAN 0.0 2048.0 Lowest channel number 0=>all ECHAN 0.0 2048.0 Highest channel number IMSIZE 32. 4096. Image size (X,Y) in pixels CELLSIZE 1.E-12 (X,Y) size of grid in asec RASHIFT RA shift (asec) DECSHIFT DEC shift (asec) UVTAPER 0. (U,V) gaussian taper units are kilolambda UVRANGE 0. Min & max baseline (klambda) UVWTFN UV dist. weight function blank => uniform UVBOX 0. 128. Additional rows and columns used in weighting. Use 0. XTYPE 0. 10. Conv. function type in x default spheroidal YTYPE 0. 10. Conv. function type in y default spheroidal XPARM Conv. function parms for x YPARM Conv. function parms for y BADDISK Disk drive #'s to avoid ---------------------------------------------------------------- CXPOLN Procedure: This procedure will produce complex polarization images using a combination of tasks UVPOL and MX. The images are then normalized such that the amplitude of the reference pixel of the complex beam is 1.0. These images are suitable for deconvolution using CXCLN. Before attempting to use CXPOLN the RUN file CXPOLN must be run to define the procedure. This is done by: >RUN CXPOLN and only needs be done once. CXPOLN creates several temporary files which it will destroy if able. The names of these files are fixed and must be destroyed if a previous attempt at CXPOLN failed. Also the output files must not exist before running CXPOLN. Adverbs: INNAME.....Input UV file name (name). Standard defaults. INCLASS....Input UV file name (class). Standard defaults. INSEQ......Input UV file name (seq. #). 0 -> highest. INDISK.....Disk drive # of input UV file. 0 -> any. OUTNAME....Output image name (name). Specify please. Default is 'CXPOL output This procedure will produce 4 images with classes 'QIM001', 'UIM001', 'QBM001', and 'UBM001' OUTDISK....The disk drive # of output images. Default 1. OUTSEQ.....Output sequence number. Default 99. It is best to specify these things. BIF........First IF to image. 0=>all. EIF........Highest IF to image. 0=>all higher than BIF BCHAN......First channel to image. 0=>all. ECHAN......Highest channel to image. 0=>all higher than BIF IMSIZE.....(X,Y) image size in pixels. Must be a power of 2 on each side from 32X32 to 4096X2048 CELLSIZE...(X,Y) pixel separation in asec. RASHIFT....RA shift of the phase center of field from the tangent point of the uv data in asec. Map center = tangent point + shift. If X>0 shifts map center to east. NOTE: RASHIFT and DECSHIFT are not strictly a shift in RA and dec. The effect of RASHIFT on the RA of the map center is roughtly RASHIFT/COS(dec). If the uv data has been rotated then RASHIFT and DECSHIFT refer to X and Y in the new coordinate system. NOTE: only does 1 field. DECSHIFT...Declination shift of map center from tangent point of field in asec. Map center = tangent point + shift. If Y>0 shifts map center to north. UVTAPER....(U,V) gaussian taper (kilolambda) at 30% level UVRANGE....(Minimum,Maximum) baseline (kilolambda) in map. UVWTFN.....Weighting function of (u-v) place. blank=>Uniform; 'NA'=>Natural UVBOX......(U,V) box size for smoothing. See HELP UVBOX XTYPE......Convolution function type in X-direction 1=Pillbox, 2=exponential, 3=Sinc, 4=Exp*Sinc, 5=Spheroidal, 6=exp*BESSJ1(x)/x. <= 0 or > 5 -> 5. YTYPE.....Convolution function type in Y-direction XPARM.....Array containing parameters for XTYPE. See HELP UVnTYPE when n=convolution type. YPARM.....Array containing parameters for YTYPE. BADDISK...Disk drive #'s to avoid for scratch files ----------------------------------------------------------------