; SPECINDX ;--------------------------------------------------------------- ;! Spectral index used to correct calibrations ;# ADVERB CALIBRATION SPECTRAL ;----------------------------------------------------------------------- ;; Copyright (C) 2004, 2010 ;; 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 ;----------------------------------------------------------------------- ;--------------------------------------------------------------- SPECINDX LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ---------------------------------------------------------------- SPECINDX Type: Adverb (Real) Use: Spectral index defined so that the flux is proportional to (frequency) ^ (spectral index) In full detail: log(T(f)/T(f0) = S * log(f/f0) + C(1) * (log(f/f0))^2 + C(2) * (log(f/f0))^3 + C(3) * (log(f/f0))^4 where S is SPECINDEX and C is SPECURVE, f0 is 1 GHz for simplicity, and all logs are base 10. It is unlikely for you to have reliable values for SPECURV(3); SETJY uses only through SPECURVE(2) for the basic flux calibration sources. Tasks: BPASS.....Computes spectral bandpass correction table. SPECINDX is used to remove a slope from the derived bandpass amplitude spectrum. SOUSP.....Fits SPECINDX and SPECURVE to the fluxes in an SU table returning the values for input to BPASS. ----------------------------------------------------------------