; BOXES ;--------------------------------------------------------------- ;! Adds Clean boxes to BOXFILE around sources from a list ;# Task Imaging Modeling ;----------------------------------------------------------------------- ;; Copyright (C) 2002-2003, 2005, 2008 ;; 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 ;----------------------------------------------------------------------- BOXES LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC BOXES: Task to make a BOXFILE for input to IMAGR INNAME UV dataset name (name) INCLASS UV dataset name (class) INSEQ 0.0 9999.0 UV dataset name (seq. #) INDISK 0.0 9.0 Disk drive # SOURCES Source selected BOXFILE disk file to read field locs and Clean boxes OBOXFILE output file to incl field locs and Clean boxes CELLSIZE 0.0 (X,Y) size of grid in asec IMSIZE 0.0 16384 field size NFIELD 0.0 4096. Number of facets RASHIFT RA shift per field (asec) DECSHIFT DEC shift per field (asec) FLUX 0.0 Minimum component flux (source * beam) BPARM (1) Radius of box pixels (2) Box scale if width > 0 (3) Factor to scale NVSS fluxes, 0 -> 1 (4) > 0 -> keep old boxes (5) Max field # to use PBPARM Beam parameters: (1) Cutoff 0 -> 0.023 (2) > 0 -> Use (3)-(7) (3)-(7) Beam shape INLIST NVSS input file name ' ' => AIPS provided. ---------------------------------------------------------------- BOXES Type: Task Use: BOXES creates Clean boxes containing all NVSS (or WENSS or ??) sources > n milliJy that would fall in the images specified by the input data file and BOXFILE. The survey flux of each source is multiplied by the single-dish beam pattern out to a specified cutoff. Adverbs: INNAME......The UV dataset name (name). Standard defaults. INCLASS.....The UV dataset name (class). Standard defaults. INSEQ.......The UV dataset name (seq. #). 0 => highest. INDISK......The disk drive #. 0 => any. SOURCES.....The source to be used from a multi-source file; a single source name is required to get the central pointing position from the source table. Ignored for single-source files. BOXFILE.....Input text file containing field coordinates. No real default, ' ' => that there is none. In that case, NFIELD, RASHIFT, and DECSHIFT specify fully the field locations. Otherwise, the task starts with these adverb values and overrides them following the information in BOXFILE. OBOXFILE....Output box file contains BOXFILE (with or without the previous Clean boxes) plus Clean boxes around sources. No default and may not pre-exist. CELLSIZE....Pixel size for the fields in IMAGR in arc seconds. IMSIZE......Size of each field. NFIELD......The number of fields to map in the antenna beam. Up to 4096 are allowed. 0 -> set by max field in BOXFILE and/or bPARM(5). Note that only 64 fields may be described in adverbs, but 4096 are allowed. If you want to set Clean boxes in advance for more than the first field, or wish to specify RASHIFT, DECSHIFT, FLDSIZE, or BCOMP for fields > 64, you must use the BOXFILE option. RASHIFT.....RA shift of the phase center of each 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 is a shift in RA scaled by cos (Dec_0) as Ra_new(i) = RA_0 + RASHIFT(i) / cos (Dec_0) where _0 => the tangent point in the uv data. This is a change for 15OCT99 from shifts in -SIN projection (which do not work for -NCP data and large angles). If the UV data have been rotated then RASHIFT and DECSHIFT refer to X and Y in the new coordinate system. DECSHIFT....Declination shift of map center from tangent point of each field in asec. Map center = tangent point + shift. If Y>0 shifts map center to north. FLUX........Minumum included component "flux" = source flux times the single-dish beam power. 0 => any in INLIST. Fluxes are read from the table, scaled by BPARM(3), and then compared to FLUX. BPARM.......(1) Clean boxes are circles of BPARM(1) pixels radius when there is no source width parameter given in INLIST for the particular source. The NVSS and WENSS tables provided do not show widths. <= 1 -> 3 (2) When a width parameter is provided (e.g. from MFPRT) for a source in INLIST, the Clean box is then made a circle of radius = BPARM(2) times the source FWHM (converted to pixels). <= 0 -> 1.5. (3) Factor to scale NVSS fluxes (to account for spectral index on average). 0 -> 1 (4) > 0 => keep all Clean boxes found in the input. <= 0 => keep only Clean boxes for fields numbered > BPARM(5) (5) Max field number to consider: 0 -> 4096. All fields are copied to OBOXFILE but only those numbered <= BPARM(5) are altered. PBPARM......Primary beam parameters: (1) Lowest beam value to believe: 0 -> 0.023 Sources outside this range are ignored. (2) > 0 => Use beam parameters from PBPARM(3)-PBPARM(7) Otherwise use default parameters for the VLA (or ATCA where appropriate) (3-7)..For all wavelengths, the beam is described by the function: 1.0 + X*PBPARM(3)/(10**3) + X*X*PBPARM(4)/(10**7) + X*X*X*PBPARM(5)/(10**10) + X*X*X*X*PBPARM(6)/(10**13) X*X*X*X*X*PBPARM(7)/(10**16) where X is (distance from the pointing position in arc minutes times the frequency in GHz)**2. For the VLA, these parms are, by default, given by Perley's fits: 0.0738 GHz -0.897 2.71 -0.242 0.3275 -0.935 3.23 -0.378 1.465 -1.343 6.579 -1.186 4.885 -1.372 6.940 -1.309 8.435 -1.306 6.253 -1.100 14.965 -1.305 6.155 -1.030 22.485 -1.417 7.332 -1.352 43.315 -1.321 6.185 -0.983 For the ATCA, these are by default: 1.5 GHz -1.049 4.238 -0.8473 0.09073 -5.004E-3 2.35 -0.9942 3.932 -0.7772 0.08239 -4.429E-3 5.5 -1.075 4.651 -1.035 0.12274 -6.125E-3 8.6 -0.9778 3.875 -0.8068 0.09414 -5.841E-3 20.5 -0.9579 3.228 -0.3807 0.0 0.0 See explain for details INLIST......Catalog input file name. For format see Explain ' ' => AIPS-provided file with 237600 objects, either 'AIPSTARS:NV00.0030' for J2000 or 'AIPSTARS:NV50.0030' for B1950. Other AIPSTARS: files available are Epoch 2000: FLUX >= 1.000 NV00.1000 ( 2267 objects) FLUX >= 0.300 NV00.0300 ( 14456 objects) FLUX >= 0.100 NV00.0100 ( 63411 objects) FLUX >= 0.030 NV00.0030 (237600 objects) Epoch 1950: FLUX >= 1.000 NV50.1000 ( 2267 objects) FLUX >= 0.300 NV50.0300 ( 14456 objects) FLUX >= 0.100 NV50.0100 ( 63411 objects) FLUX >= 0.030 NV50.0030 (237600 objects) The WENSS/WISH surveys ar also available $AIPSTARS as FLUX >= 0.100 WE00.0100 ( 99709 object 2000) FLUX >= 0.100 WE50.0100 ( 99709 object 1950) Some sites may choose to download really large source lists to deeper flux levels. These may include from the NVSS survey: FLUX >= 0.003 NV00.0003 (1560007 objects, 2000) FLUX >= 0.003 NV50.0003 (1560007 objects, 1950) and the WENSS/WISH survey: FLUX >~ 0.010 WE00.0000 (319770 objects, 2000) FLUX >~ 0.010 WE50.0000 (319770 objects, 1950) These deep files may be particularly useful for BOXES. Note: the WENSS survey covers +90 to +28 degrees declination and the WISH survey covers -25 to -15 with some sources to -9. ---------------------------------------------------------------- BOXES: Task to make Clean boxes from the NVSS (or WENSS or ??) DESCRIPTION The task creates Clean boxes for all fields in BOXFILE. The NVSS or other source catalog is then searched for all sources which would fit in these images within the primary or single-dish beam. Those sources that fit in one or more of the images are added to those images. In order to do all this, the position (RA,DEC) of the pointing phase center is required. This is obtained from the input UV data set. In the case of a single-source data set, it is read from the header. In the case of a multi-source data set, the source must be specified in the first element of the adverb SOURCES, and the position is read from the SU extension. The selection of sources is by the adverb BPARM(3) and FLUX. The source catalog may be specified in INLIST or you may use one of the AIPS-provided versions of the NVSS or WENSS. The format of the file is: All lines beginning with a semi-colon are ignored. They are the copyleft, a descriptive text in the AIPS files, and other comments. Be careful about the epoch of the coordinates. Remaining give the Right ascension in degrees, Declination in degrees, Flux in mJy, and optionally a FWHM in arc seconds using format F9.5,1X,F9.5,I7,F10.4. A sample is given below (a width is shown although the actual NVSS files provided by AIPS have no widths). ;----------------------------------------------------------------------- ; Copyright (C) 1999-2000, 2002 ; 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 ;----------------------------------------------------------------------- ; NRAO/VLA Sky Survey (NVSS) from CATALOG39.FIT ; 2267 sources brighter than 1.0 Jy ; Catalog made on 1998-07-10 with 1814748 entries ;RA(2000) Dec(2000) Flux FWHM ; deg deg mJy arc secs 0.08521 55.65239 1518 3.1234 0.22108 40.90052 1301 0.84166 -17.45316 2415 1.23802 12.80524 1071 1.37727 69.39949 1105 1.55780 -6.39310 2051 1.59416 -0.07363 3898 2.12217 -5.97935 1323 ;..... 358.54728 32.91998 1183 358.59049 45.88455 1873 358.78961 49.83570 2306 358.97312 15.69069 1104 359.25280 -34.75882 1286 359.32748 14.76875 1020 359.38022 -11.42748 1814 359.64781 44.07789 1940 RICK PERLEY'S REPORT Polynomial Coefficients from LSq Fit to VLA Primary Beam raster scans. Functional form fitted: 1 + G1.X^2 + G2.X^4 + G3.X^6 where X = r.F, and r = radius in arcminutes F = frequency in GHz. Fits were made to 3% cutoff in power for 24 antennas. Poor fits, and discrepant fits were discarded, and the most consistent subset of antennas had their fitted coefficients averaged to produce the following 'best' coefficients. Freq. G1 G2 G3 ---------------------------------------------------------- 0.0738 -0.897E-3 2.71 E-7 -0.242E-10 0.3275 -0.935 3.23 -0.378 1.285 -1.329 6.445 -1.146 * 1.465 -1.343 6.579 -1.186 4.885 -1.372 6.940 -1.309 8.435 -1.306 6.253 -1.100 14.965 -1.305 6.155 -1.030 22.485 (old) -1.350 6.526 -1.090 * 22.485 (new) -1.417 7.332 -1.352 43.315 -1.321 6.185 -0.983 ----------------------------------------------------------- The estimated errors (from the scatter in the fitted coefficients) are generally very small: G1: .003 at all bands except Q (.014) G2: .03 to .07 at all bands except Q (.15) G3: .01 to .02 at all bands except Q (.04) R. Perley 21/Nov/00 * The 1.285 and 22.485 old feed values are not used.