; BWSMEAR ;--------------------------------------------------------------- ;! amount of bandwidth smearing correction to use ;# ADVERB ANALYSIS ;----------------------------------------------------------------------- ;; Copyright (C) 1998 ;; Associated Universities, Inc. Washington DC, USA. ;; Eric W. Greisen ;; ;; 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 ;----------------------------------------------------------------------- BWSMEAR LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ---------------------------------------------------------------- BWSMEAR Type: Adverb (scalar) Use: To specify how much correction to make for bandwidth smearing. For model fitting, the bandwidth smearing function is taken to be a Gaussian in the radial direction of FWHM = BWSMEAR times the radius from the original pointing direction. This is really not the correct function to use. The bandwidth shape itself should be used. But that varies from antenna to antenna and makes the Clean beam convolved with that shape into something other than a Gaussian. Give the task something like the bandwidth divided by the center frequency. The fitting tasks smear the basic Clean beam with this function when the Clean beam is used for the initial guess of the compnent widths and when the Clean beam is used for deconvolving the fit widths to estimate the true widths. Null value: <= 0 Taken to mean do no correction. Tasks: IMFIT.....Fits up to four Gaussians JMFIT.....Fits up to four Gaussians SAD.......Fits up to 4000 Gaussians in a subimage, finding the source regions itself and attempting simple and multiple-Gaussian fits to each region. ----------------------------------------------------------------