dustem_fit_sed_readme.pro
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PRO dustem_fit_sed_readme,postcript=postcript,model=model,help=help,png=png,itermax=itermax
;This Readme describes how to fit SEDs with dustem
;It runs on the SED stored into the file sample_SED.xcat
;in this directory. Remember that the goal here is not necessarily to
;obtain a good fit in the end, but to illustrate the method.
;The provided SED has only photometric data points from SPITZER
;IRAC and MIPS and IRAS. No spectrum data points.
;SPECTRUM data points can be included and the corresponding filter
;filed must read SPECTRUM. Note that its is note necessary
;to use the .xcat file format, and data SED can be provided
;manually, but the observation structure must have the structure shown below.
;Obviously, the dustem package must have been installed succesfully (see
;dustem_cvs_readme.txt for install instructions).
;+
; NAME:
; dustem_fit_sed_readme
; PURPOSE:
; This is an example of how to fit SEDs with the dustem wrapper.
; It is meant to be an example to follow when writing your own
; programs using the dustem IDL wrapper.
; It is not meant to reproduce the result in Compiegne et al 2010
; The SED used here is in sample_SED.xcat
; CATEGORY:
; Dustem
; CALLING SEQUENCE:
; dustem_fit_sed_readme,postcript=postcript,model=model,help=help
; INPUTS:
; None
; OPTIONAL INPUT PARAMETERS:
; None
; OUTPUTS:
; None
; OPTIONAL OUTPUT PARAMETERS:
; None
; ACCEPTED KEY-WORDS:
; model = Selects one of the dust mixture used by dustem
; 'COMPIEGNE_ETAL2010' from Compiegne et al 2010 (default)
; 'DBP90' from Desert et al 1990
; 'DL01' from Draine & Li 2001
; 'DL07' from Draine & Li 2007
; postcript = if set plot is done in DUSTEM/Docs/Figures/Last_dustem_fit.ps
; help = If set print this help
; COMMON BLOCKS:
; None
; SIDE EFFECTS:
; None
; RESTRICTIONS:
; The dustem fortran code must be installed
; The dustem idl wrapper must be installed
; PROCEDURE:
; None
; EXAMPLES
; dustem_fit_sed_readme,model='COMPIEGNE_ETAL2010'
; MODIFICATION HISTORY:
; Written by J.P. Bernard April 1st 2011
; see evolution details on the dustem cvs maintained at CESR
; Contact J.-Ph. Bernard (Jean-Philippe.Bernard@cesr.fr) in case of problems.
;-
IF keyword_set(help) THEN BEGIN
doc_library,'dustem_fit_sed_readme'
goto,the_end
ENDIF
IF keyword_set(model) THEN BEGIN
use_model=strupcase(model)
ENDIF ELSE BEGIN
use_model='COMPIEGNE_ETAL2010' ;Default is last dustem model
ENDELSE
IF keyword_set(png) THEN BEGIN
dir_png=!dustem_dat+'/Figures/'
force_mkdir,dir_png
ENDIF
polarization=0 ;default is no polarization in models
dustem_init,model=use_model,pol=polarization
;=== Set which parameters you want to fit
CASE use_model OF
'DBP90':BEGIN
pd = [ $
'(*!dustem_params).G0', $ ;G0
'(*!dustem_params).grains(0).mdust_o_mh',$ ;PAH0 mass fraction
'(*!dustem_params).grains(1).mdust_o_mh',$ ;PAH1 mass fraction
'(*!dustem_params).grains(2).mdust_o_mh', $ ;amCBEx
'dustem_create_continuum_2'] ;Intensity of NIR continuum
iv = [1.0, 4.3e-4, 4.7e-4,6.4e-3,0.001]
Npar=n_elements(pd)
ulimed=replicate(0,Npar)
llimed=replicate(1,Npar)
llims=replicate(0.,Npar)
END
'DL01':BEGIN
pd = [ $
'(*!dustem_params).G0', $ ;G0
'(*!dustem_params).grains(0).mdust_o_mh',$ ;PAH0 mass fraction
'(*!dustem_params).grains(1).mdust_o_mh',$ ;PAH1 mass fraction
'(*!dustem_params).grains(2).mdust_o_mh', $ ;Gra
'(*!dustem_params).grains(3).mdust_o_mh', $ ;Gra
'(*!dustem_params).grains(4).mdust_o_mh', $ ;aSil
'dustem_create_continuum_2'] ;Intensity of NIR continuum
iv = [1.0,5.4e-4, 5.4e-4,1.8e-4,2.33e-3,8.27e-3,0.001]
Npar=n_elements(pd)
ulimed=replicate(0,Npar)
llimed=replicate(1,Npar)
llims=replicate(0.,Npar)
END
'DL07':BEGIN
pd = [ $
'(*!dustem_params).G0', $ ;G0
'(*!dustem_params).grains(0).mdust_o_mh',$ ;PAH0 mass fraction
'(*!dustem_params).grains(1).mdust_o_mh',$ ;PAH1 mass fraction
'(*!dustem_params).grains(2).mdust_o_mh', $ ;Gra
'(*!dustem_params).grains(3).mdust_o_mh', $ ;Gra
'(*!dustem_params).grains(4).mdust_o_mh', $ ;aSil
'dustem_create_continuum_2'] ;Intensity of NIR continuum
iv = [1.0,5.4e-4, 5.4e-4,1.8e-4,2.33e-3,8.27e-3,0.001]
Npar=n_elements(pd)
ulimed=replicate(0,Npar)
llimed=replicate(1,Npar)
llims=replicate(0.,Npar)
END
'COMPIEGNE_ETAL2010':BEGIN
;parameter description of parameters to be fitted
pd = [ $
;'(*!dustem_params).gas.G0', $ ;G0
'dustem_create_continuum_2', $ ;intensity of NIR continuum
;'!dustem_isrf_star_add[0].distance', $ ;distance of first stellar contribution to ISRF
'!dustem_isrf_star_add[0].amplitude', $ ;amplitude of first stellar contribution to ISRF
'(*!dustem_params).grains(0).mdust_o_mh',$ ;PAH0 mass fraction
'(*!dustem_params).grains(1).mdust_o_mh',$ ;PAH1 mass fraction
'(*!dustem_params).grains(2).mdust_o_mh', $ ;amCBEx
'(*!dustem_params).grains(3).mdust_o_mh', $ ;amCBEx
'(*!dustem_params).grains(4).mdust_o_mh' $
]
;initial parameter values for parameters to be fitted
iv = [ $
;1.0, $
0.002, $ ;intensity of NIR continuum
;0.003, $ ;distance of first stellar contribution to ISRF
1.e-3, $ ;amplitude of first stellar contribution to ISRF
7.8e-4, $ ;mass fraction of PAH0
7.8e-4, $ ;mass fraction of PAH1
1.65e-4, $ ;mass fraction of amCBEx
1.45e-3, $ ;mass fraction of amCBEx
7.8e-3 $ ;mass fraction of
]
Npar=n_elements(pd)
ulimed=replicate(0,Npar)
llimed=replicate(1,Npar)
llims=replicate(0.,Npar)
;=== Fixed parameters
;parameter description of parameters to be set to a non-default value
fpd=[ $
;'!dustem_isrf_star_add[0].amplitude', $ ;amplitiude of first stellar contribution to ISRF
;'!dustem_isrf_star_add[0].distance', $ ;amplitiude of first stellar contribution to ISRF
'(*!dustem_params).gas.G0' $ ;multiplicative factor to total ISRF
;'dustem_create_continuum_2' $ ;intensity of NIR continuum
]
;initial parameter values for fixed parameters
fiv=[ $
;1.0, $ ;amplitiude of first stellar contribution to ISRF
;1.0, $ ;distance of first stellar contribution to ISRF
1. $ ;multiplicative factor to total ISRF
;1.e-6 $ ;intensity of NIR continuum
]
END
'AJ13':BEGIN
pd = [ $
'(*!dustem_params).G0', $ ;G0
'(*!dustem_params).grains(1).mdust_o_mh',$ ;PAH1 mass fraction
'(*!dustem_params).grains(0).mdust_o_mh',$ ;PAH0 mass fraction
'(*!dustem_params).grains(2).mdust_o_mh', $ ;amCBEx
'(*!dustem_params).grains(3).mdust_o_mh', $ ;amCBEx
'(*!dustem_params).grains(4).mdust_o_mh', $ ;aSil
'dustem_create_continuum_2'] ;Intensity of NIR continuum
iv = [1.0, 7.8e-4, 7.8e-4,1.65e-4,1.45e-3,7.8e-3,0.001]
Npar=n_elements(pd)
ulimed=replicate(0,Npar)
llimed=replicate(1,Npar)
llims=replicate(0.,Npar)
END
'G17_MODELA':BEGIN
dustem_init,model=use_model,/pol
pd = [ $
'(*!dustem_params).G0', $ ;G0
'(*!dustem_params).grains(0).mdust_o_mh',$ ;PAH0 mass fraction
'(*!dustem_params).grains(1).mdust_o_mh',$ ;PAH1 mass fraction
'(*!dustem_params).grains(2).mdust_o_mh', $ ;Gra
'(*!dustem_params).grains(3).mdust_o_mh', $ ;Gra
'(*!dustem_params).grains(4).mdust_o_mh', $ ;aSil
'dustem_create_continuum_2'] ;Intensity of NIR continuum
iv = [1.0,5.4e-4, 5.4e-4,1.8e-4,2.33e-3,8.27e-3,0.001]
Npar=n_elements(pd)
ulimed=replicate(0,Npar)
llimed=replicate(1,Npar)
llims=replicate(0.,Npar)
polarization=1
END
'G17_MODELB':BEGIN
pd = [ $
'(*!dustem_params).G0', $ ;G0
'(*!dustem_params).grains(0).mdust_o_mh',$ ;PAH0 mass fraction
'(*!dustem_params).grains(1).mdust_o_mh',$ ;PAH1 mass fraction
'(*!dustem_params).grains(2).mdust_o_mh', $ ;Gra
'(*!dustem_params).grains(3).mdust_o_mh', $ ;Gra
'(*!dustem_params).grains(4).mdust_o_mh', $ ;aSil
'dustem_create_continuum_2'] ;Intensity of NIR continuum
iv = [1.0,5.4e-4, 5.4e-4,1.8e-4,2.33e-3,8.27e-3,0.001]
Npar=n_elements(pd)
ulimed=replicate(0,Npar)
llimed=replicate(1,Npar)
llims=replicate(0.,Npar)
polarization=1
END
ENDCASE
dustem_init,model=use_model,pol=polarization
!dustem_verbose=1
!dustem_show_plot=1
;=== Read sample SED
;=== Composite SED from Compiegne et al 2010, gathered by C. Bot
dir=!dustem_wrap_soft_dir+'/Data/SEDs/'
file=dir+'Gal_composite_spectrum.xcat'
spec=read_xcat(file,/silent)
ind=where(spec.error EQ 0.,count)
IF count NE 0 THEN spec(ind).error=0.2*spec(ind).spec
ind=where(spec.instru EQ 'FIRAS',count)
IF count NE 0 THEN spec(ind).error=0.2*spec(ind).spec
;=== SET THE OBSERVATION STRUCTURE
st=dustem_set_data(sed=spec)
;== SET THE FITTED PARAMETERS
dustem_init_parinfo,pd,iv,up_limited=ulimed,lo_limited=llimed,up_limits=ulims,lo_limits=llims
dustem_init_fixed_params,fpd,fiv
dustem_init_plugins, pd ;initializing the scopes of the plugins to be read later
;=== RUN fit
tol=1.e-14
use_Nitermax=2 ;maximum number of iteration. This is the criterium which will stop the fit procedure
IF keyword_set(itermax) THEN use_Nitermax=itermax
t1=systime(0,/sec)
yr=[1e-4,10]
xr=[1,1.e5]
legend_xpos=0.6
legend_ypos=0.8
tit='DUSTEMWrapper Intensity SED (Running)'
ytit=textoidl('I_\nu (MJy/sr) for N_H=10^{20} H/cm^2')
xtit=textoidl('\lambda (\mum)')
res=dustem_mpfit_data(tol=tol,Nitermax=use_Nitermax,gtol=gtol,/xlog,/ylog,xr=xr,yr=yr,xtit=xtit,ytit=ytit,title=tit,legend_xpos=legend_xpos,legend_ypos=legend_ypos,errors=errors,chi2=chi2,rchi2=rchi2)
t2=systime(0,/sec)
;=== SAVE FIT RESULTS
file_out='/tmp/DUSTEM_fit_example.sav'
dustem_save_system_variables,file_out
message,'Saved '+file_out,/continue
;stop
;======================================
;====You can exit IDL here and re-enter
;======================================
file='/tmp/DUSTEM_fit_example.sav'
dustem_restore_system_variables,file
;=== Plot best fit
tit='DUSTEMWrapper Intensity SED fit Example (Saved)'
ytit=textoidl('I_\nu (MJy/sr) for N_H=10^{20} H/cm^2')
xtit=textoidl('\lambda (\mum)')
errors=(*(*!dustem_fit).current_param_errors)*(*(*!dustem_fit).param_init_values)
chi2=(*!dustem_fit).chi2
rchi2=(*!dustem_fit).rchi2
window,2
;=== RESTORE FIT RESULTS
res=*(*!dustem_fit).current_param_values
chi2=(*!dustem_fit).chi2
rchi2=(*!dustem_fit).rchi2
errors=(*(*!dustem_fit).current_param_errors)*(*(*!dustem_fit).param_init_values)
;=== Plot best fit
loadct,13
IF keyword_set(postcript) THEN BEGIN
set_plot,'PS'
; ps_file=getenv('DUSTEM_SOFT_DIR')+'/Docs/Figures/'+'Last_dustem_fit.ps'
ps_file=!dustem_wrap_soft_dir+'/Docs/Figures/'+'Last_dustem_fit.ps'
device,filename=ps_file,/color
ENDIF
;dustem_sed_plot,(*!dustem_fit_params),ytit=ytit,xtit=xtit,title=tit,yr=yr,xr=xr,/ysty,/xsty,res=res,errors=errors,chi2=chi2,rchi2=rchi2
dustem_sed_plot,*(*!dustem_fit).current_param_values,ytit=ytit,xtit=xtit,title=tit,yr=yr,xr=xr,/ysty,/xsty,res=res,errors=errors,chi2=chi2,rchi2=rchi2,/xlog,/ylog,legend_xpos=legend_xpos,legend_ypos=legend_ypos
IF keyword_set(postcript) THEN BEGIN
device,/close
set_plot,'X'
message,'wrote '+ps_file,/info
ENDIF
IF keyword_set(png) THEN BEGIN
;file_png=!dustem_wrap_soft_dir+'/Docs/Figures/'+'Last_dustem_fit.png'
file_png=dir_png+'Last_dustem_fit_sed_readme.png'
write_png,file_png,tvrd(/true)
message,'Wrote '+file_png,/info
ENDIF
message,'dustem_mpfit_sed executed in '+strtrim(t2-t1,2)+' sec',/info
the_end:
END