dustem_fit_polarization_example.pro
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PRO dustem_fit_polarization_example,model=model $
,sed_file=sed_file $
,Nitermax=Nitermax $
,postscript=postscript $
,fits_save_and_restore=fits_save_and_restore $
,help=help $
,wait=wait $
,verbose=verbose
;+
; NAME:
; dustem_fit_polarization_example
;
; PURPOSE:
; This is an example of how to fit observational SEDs (with
; measurements in Stokes IQU) using DustEMWrap.
; It is intended as an example to follow when writing your own
; programs to analyse data with DustEMWrap.
;
; CATEGORY:
; DustEMWrap, Distributed, High-Level, User Example
;
; CALLING SEQUENCE:
; dustem_fit_polarization_example[,model=][sed_file=][,postscript=][,Nitermax=][,fits_save_and_restore=][,/help,/wait,/verbose]
;
; INPUTS:
; None
;
; OPTIONAL INPUT PARAMETERS:
; None
;
; OUTPUTS:
; None
;
; OPTIONAL OUTPUT PARAMETERS:
; Plots, Results save structure in binary FITS table format
;
; ACCEPTED KEY-WORDS:
; model = specifies the interstellar dust mixture used by DustEM
; 'G17_ModelA' model A from Guillet et al (2018). See Tables 2 and 3 of that paper for details.
; 'G17_ModelB' model B from Guillet et al (2018)
; 'G17_ModelC' model C from Guillet et al (2018)
; 'G17_ModelD' model A from Guillet et al (2018). Default.
; sed_file = string naming the path to text file in .xcat format that
; describes the observational SED. If not set, the file
; 'Data/EXAMPLE_OBSDATA/example_SED_3.xcat' is used.
; postscript = if set, final plot is saved as postscript in the
; current working directory
; Nitermax = maximum number of fit iterations. Default is 5.
; fits_save_and_restore = if set, saves results in a fits file,
; restore the file and plot restored results
; help = if set, print this help
; wait = if set, wait this many seconds between each step of
; the code (for illustration purposes)
; verbose = if set, subroutines will run in verbose mode
; COMMON BLOCKS:
; None
;
; SIDE EFFECTS:
; None
;
; RESTRICTIONS:
; The DustEM fortran code must be installed
; The DustEMWrap IDL code must be installed
;
; PROCEDURES AND SUBROUTINES USED:
;
; EXAMPLES
; dustem_fit_polarization_example
; dustem_fit_polarization_example,Nitermax=1,fits_save_and_restore='/tmp/mysavefile.fits'
; dustem_fit_polarization_example,model='DBP90'
;
; MODIFICATION HISTORY:
; Written by JPB Apr-2022
; Evolution details on the DustEMWrap gitlab.
; See http://dustemwrap.irap.omp.eu/ for FAQ and help.
;-
IF keyword_set(help) THEN BEGIN
doc_library,'dustem_fit_polarization_example'
goto,the_end
END
IF keyword_set(model) THEN BEGIN
use_model=strupcase(model)
ENDIF ELSE BEGIN
use_model='G17_MODELD' ;Default is one of the Guillet et al (2017) models since they treat dust polarization properties
ENDELSE
known_mdls=['MC10','DBP90','DL01','WD01_RV5P5B','DL07','J13','G17_MODELA','G17_MODELB','G17_MODELC','G17_MODELD']
pol_mdls=['G17_MODELA','G17_MODELB','G17_MODELC','G17_MODELD']
test_model = where(known_mdls eq use_model,ct)
if ct eq 0 then begin
message,'ISM dust model '+use_model+' unknown',/continue
message,'Known models are MC10,DBP90,DL01,WD01_RV5P5B,DL07,J13,G17_MODELA,G17_MODELB,G17_MODELC,G17_MODELD',/continue
stop
end
test_model = where(pol_mdls eq use_model,polct)
if polct eq 0 then begin
message,'The only models with polarization are G17_MODELA,G17_MODELB,G17_MODELC,G17_MODELD',/continue
stop
end
use_window=2 ; default graphics window number to use for plotting the results
use_verbose=0
if keyword_set(verbose) then use_verbose=1
use_Nitermax=5 ; maximum number of iterations for the fit
IF keyword_set(Nitermax) THEN use_Nitermax=Nitermax
dustem_define_la_common
;; ;=== AN EXAMPLE FOR G17_MODELA/B/C/D
;; ;=== Here we fit the dust abundances of the model, the dust
;; ;=== polarization and a plug-in:
;; ;=== (i) synchrotron emission (also polarized)
;; ;=== The free parameters in the fit are lower-bounded at
;; ;=== ~zero. The synchrotron parameters are constrained betweem
;; ;=== upper and lower bounds
;; ;=== The intensity of the dust-heating radiation field and the
;; ;=== spectral index of the CRE energy spectrum are fixed.
pd = [ $
'(*!dustem_params).grains(0).mdust_o_mh',$ ;PAH0 mass fraction
'(*!dustem_params).grains(1).mdust_o_mh',$ ;amorphous carbon mass fraction
'(*!dustem_params).grains(2).mdust_o_mh', $ ;amorphous silicate mass fraction
'dustem_plugin_modify_dust_pol_2', $ ;Dust polarization angle
'dustem_plugin_synchrotron_2', $ ;Synchrotron amplitude at 10 mm
'dustem_plugin_synchrotron_3', $ ;Synchrotron polarization fraction
'dustem_plugin_synchrotron_4' $ ;Synchrotron polarization angle
]
iv=[7.2e-4,7.2e-4,8.5e-4,-10.,0.015,0.25,35.]
Npar=n_elements(pd)
ulimed=[0,0,0,0,1,1,1]
llimed=[1,1,1,0,1,1,1]
ulims=[0,0,0,0,0.02,0.5,60.]
llims=[1.e-15,1.e-15,1.e-15,0,0.005,0.05,30.]
fpd=[ '(*!dustem_params).G0' , $ ; intensity of the dust-heating radiation field
'dustem_plugin_synchrotron_1'] ;Synchrotron CR spectral index
fiv=[1.0,3.0]
use_polarization=1
;Nfix=n_elements(fpd)
;if n_elements(fiv) ne Nfix then begin
; message,'Number of fixed parameters (fpd) does not equal number of initial values of fixed parameters (fiv)',/info
; stop
;end
;== INITIALISE DUSTEM
;dustem_init,mode=use_model,grain_keywords=['logn-chrg-spin','?','plaw-pol'],polarization=1
dustem_init,model=use_model,pol=use_polarization
!dustem_verbose=1
;!dustem_show_plot=1
!dustem_nocatch=1
;=== READ EXAMPLE SED DATA
dir=!dustem_wrap_soft_dir+'/Data/EXAMPLE_OBSDATA/'
file=dir+'example_SED_3.xcat'
IF keyword_set(sed_file) THEN file=sed_file
sed=read_xcat(file,/silent)
;== SET THE OBSERVATIONAL STRUCTURE
;== sed is passed twice -- the first occurrence is the SED that you
;== wish to fit, the second occurrence is the SED that you wish to visualise.
dustem_set_data,m_fit=sed,m_show=sed
;== SET INITIAL VALUES AND LIMITS OF THE PARAMETERS THAT WILL BE
;== ADJUSTED DURING THE FIT
dustem_init_params,use_model,pd,iv,fpd=fpd,fiv=fiv,ulimed=ulimed,llimed=llimed,ulims=ulims,llims=llims,pol=use_polarization
;=== RUN fit
;number of iterations has already been specified in the beginning of the code.
tol=1.e-16
xtol=1.e-16
use_Nitermax=5; an initialization
IF keyword_set(Nitermax) THEN use_Nitermax=Nitermax
xrange=[1.,2.e4]
yrange=[1e-4,1.e3]
;Set show_plot to 0 to hide plot
;Commented or set to 1 is the same since !dustem_show_plot (existing sysvar) is initialized to 1 in dustem_init
;show_plot = 0
loadct,13
t1=systime(0,/sec)
title='FIT POLARIZATION EXAMPLE'
res=dustem_mpfit_data(tol=tol,xtol=xtol,Nitermax=use_Nitermax,xrange=xrange,/xstyle,yrange=yrange $
,/ysty,/ylog,/xlog,xtit='wavelength [mic]',ytit='Brightness []' $
,title=title,show_plot=show_plot)
t2=systime(0,/sec)
if keyword_set(wait) then begin
message,'Finished running DustEMWrap, using Niters: '+strtrim(string(use_Nitermax),2),/info
message,'Time taken [sec]: '+sigfig(t2-t1,2,/sci),/info
wait,wait
end
;=== MAKE THE FINAL PLOT
IF keyword_set(postscript) THEN BEGIN
dir_ps='./'
set_plot,'PS'
ps_file=dir_ps+postscript
device,filename=ps_file,/color
ENDIF
IF !dustem_noobj THEN BEGIN
dustemwrap_plot_noobj,(*(*!dustem_fit).CURRENT_PARAM_VALUES),st=dummy,xr=xr,/xstyle,yr=yr,/ysty,/ylog,/xlog,title=title+' (Final fit)'
ENDIF ELSE BEGIN
dustemwrap_plot,(*(*!dustem_fit).CURRENT_PARAM_VALUES),st=dummy,xr=xr,/xstyle,yr=yr,/ysty,/ylog,/xlog,title=title+' (Final fit)'
ENDELSE
IF keyword_set(postscript) THEN BEGIN
set_plot,'X'
device,/close
message,'Wrote '+ps_file,/info
ENDIF
if keyword_set(wait) then begin
message,'Made the plot of the final results',/info
wait,wait
end
IF keyword_set(fits_save_and_restore) THEN BEGIN
message,'Writing out results structure: '+fits_save_and_restore,/info
dustem_write_fits_table,filename=fits_save_and_restore,help=help
;=== At this point, you could erase all dustem system variables, or exit idl... all the
;=== information needed to recover the results and remake the plots has been saved in the FITS table
dustem_read_fits_table,filename=fits_save_and_restore,dustem_st=dustem_spectra_st
;==== plot result taken from the saved fits table
res=*(*!dustem_fit).CURRENT_PARAM_VALUES
;If the user prefers non-OOP plotting then they will have to set !dustem_noobj=1 since dustem_init is called in reads_fits_table.
IF !dustem_noobj THEN BEGIN
dustemwrap_plot_noobj,res,st=dustem_spectra_st,xr=xr,/xstyle,yr=yr,/ysty,/ylog,/xlog,title=title+' (From saved FITS file)'
ENDIF ELSE BEGIN
dustemwrap_plot,res,st=dustem_spectra_st,xr=xr,/xstyle,yr=yr,/ysty,/ylog,/xlog,title=title+' (From saved FITS file)'
ENDELSE
if keyword_set(wait) then begin
message,'Saved the results as FITS in the file: '+fits_save_and_restore+', and made a plot using the data in this file',/info
wait,wait
end
ENDIF
message,'Finished dustem_polarization_example',/info
;stop
the_end:
END