PRO dustem_fit_intensity_example,model=model $ ,sed_file=sed_file $ ,Nitermax=Nitermax $ ,postscript=postscript $ ,fits_save=fits_save $ ,help=help $ ,wait=wait $ ,noobj=noobj $ ,verbose=verbose ;+ ; NAME: ; dustem_fit_intensity_example ; ; PURPOSE: ; This routine is an example of how to fit an observational SED ; (StokesI only) with DustEM and DustEMWrap. The objective is to ; illustrate how to use DustEMWrap and not to do science -- the fit ; obtained by running this example is likely to be poor. ; ; For this example, the code uses the SED in the file example_SED_1.xcat, ; which is distributed in the Data/EXAMPLE_OBSDATA/ directory ; ; The example SED has Stokes I photometric data points from ; IRAC, MIPS and IRAS. Examples illustrating running DustEMWrap to ; fit spectral data, polarisation data and extinction data ; are provided in other _example routines in the src/idl/ ; directory. See the DustEMWrap User Guide for more information. ; ; CATEGORY: ; DustEMWrap, Distributed, High-Level, User Example ; ; CALLING SEQUENCE: ; dustem_fit_intensity_example[,model=][sed_file=][,postscript=][,Nitermax=][,fits_save=][,/help,/wait,/verbose] ; ; INPUTS: ; None ; ; OPTIONAL INPUT PARAMETERS: ; None ; ; OUTPUTS: ; None ; ; OPTIONAL OUTPUT PARAMETERS: ; Plots, results structure in binary FITS table format ; ; ACCEPTED KEY-WORDS: ; model = specifies the interstellar dust mixture used by ; DustEM. See userguide or dustem_test_model_exists.pro ; for more details about available models in current release. ; 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_1.xcat' is used. ; postscript = if set, final plot is saved as postscript file ; Nitermax = maximum number of fit iterations. Default is 5. ; fits_save = if set, save the fit results in a binary ; FITS file. ; 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 ; noobj = if set, runs with no object graphics ; ; 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_intensity_example ; dustem_fit_intensity_example,Nitermax=1,fits_save='/tmp/mysavefile.fits' ; dustem_fit_intensity_example,model='DBP90' ; ; MODIFICATION HISTORY: ; Written by JPB Apr-2011 ; 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_intensity_example' goto,the_end END IF keyword_set(model) THEN BEGIN use_model=strupcase(model) ENDIF ELSE BEGIN use_model='DBP90' ;Example with default keywords uses the DBP90 model ENDELSE exists=dustem_test_model_exists(use_model) if exists ne 1 then $ message,'Unknown dust model' use_polarization=0 ; initialize Dustemwrap in no polarization mode 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 ;=== Set the (model-dependent) parameters that you want to fit (pd), ;=== their initial values (iv) ;=== and whether they are bounded (ulimed,llimed,llims,ulims). ;=== Fixed parameters (fpd) and their values (fiv) are also set here. ;=== Refer to the DustEM and DustEMWrap User guides for an explanation ;=== of the physical meaning of dust model and plug-in parameters, and ;=== how to specify them. ;=== Examples are provided for some of the dust models. ;=== To try them, uncomment the model that you want to try and re-run ;=== AN EXAMPLE FOR DBP90 ;=== Here we fit the dust abundances of the DBP90 model, the ;=== intensity of the dust-heating radiation field, as well as a plug-in ;=== for synchrotron emission ;=== The free parameters are all lower-bounded at zero. ;=== use_model='DBP90' ; you should specify this above! pd = [ $ '(*!dustem_params).G0', $ ;G0 '(*!dustem_params).grains(0).mdust_o_mh',$ ;PAH0 mass fraction '(*!dustem_params).grains(1).mdust_o_mh',$ ;VSG mass fraction '(*!dustem_params).grains(2).mdust_o_mh'];,$ ;BG mass fraction ; 'dustem_plugin_synchrotron_1', $ ;Spectral index of CREs ; 'dustem_plugin_synchrotron_2'] ;Synchrotron amplitude at 10 mm ; initial values vector for run without synchrotron plugin ; [G0,PAH0,VSG,BG] iv = [1.6, 2.2e-4, 5.7e-4, 3.4e-3] ; initial values vector for run including the synchrotron plugin ; [G0,PAH0,VSG,BG,alpha_CR,Amp_syn] ;iv = [1.6, 2.2e-4, 5.7e-4, 3.4e-3, 2.7,0.01] ; initial values vector for run including the synchrotron plugin and ; fixing the G0 and BB continuum parameters ;iv = [2.2e-4, 5.7e-4, 3.4e-3, 2.7,0.01] Npar=n_elements(pd) ulimed=replicate(0,Npar) llimed=replicate(1,Npar) llims=replicate(1.e-15,Npar) fpd=[] & fiv=[] ; example using fixed parameters (ISRF and a NIR continuum) ; Uncomment the following lines to include these fixed parameters ;fpd = ['(*!dustem_params).G0', $ ;G0 ; 'dustem_plugin_continuum_1', $ ;Temperature of a BB ; 'dustem_plugin_continuum_2'] ;Peak amplitude of a BB ; fixed values vector ; [G0,T_BB,Amp_BB] ;fiv=[0.5,750,1.e-2] ;; ;================================== ;; ;=== EXAMPLES FOR OTHER DUST MODELS ;; ;=== START BELOW HERE ;; ;================================== ;; ;=== AN EXAMPLE FOR DL07 ;; ;=== Here we fit the dust abundances of the model and the ;; ;=== intensity of the ISRF (via gas.G0 since the model ;; ;=== includes spinning dust) ;; ;=== The free parameters are all lower-bounded at zero. ;; use_model='DL07' ; you should specify this above, or in the command line ;; pd = [ '(*!dustem_params).gas.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 ;; iv = [1.5 ,5.4e-4, 5.4e-4,1.8e-4,2.33e-3,8.27e-3] ;; Npar=n_elements(pd) ;; ulimed=replicate(0,Npar) ;; llimed=replicate(1,Npar) ;; llims=replicate(1.e-15,Npar) ;; ; fpd=['(*!dustem_params).gas.G0'] ;; ; fiv=[2.] ;; ;; ;=== AN EXAMPLE FOR MC10 ;; ;; ;=== Here we fit the dust abundances of the MC10 model, the ;; ;; ;=== intensity of the dust-heating radiation field as well as a plug-in: ;; ;; ;=== (i) continuum due to a blackbody ;; ;; ;=== The intensity of the dust-heating radiation field is fixed to ;; ;; ;=== 1.5*G0 and the tmperature of the blackbody is fixed to 1200K ;; ;; ;=== The free parameters in the fit are lower-bounded at zero. ;; use_model='MC10' ; you should specify this above, or in the command line ;; pd = [ $ ;; '(*!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' $ ;aSilx ;; ,'dustem_plugin_continuum_2' $ ;Intensity at peak of the continuum ;; ] ;; iv = [ 7.8e-4, 7.8e-4, 1.65e-4, 1.45e-3, 6.7e-3, 0.003] ;; Npar=n_elements(pd) ;; ulimed=replicate(0,Npar) ;; llimed=replicate(1,Npar) ;; llims=replicate(1.e-15,Npar) ;; fpd=[ $ ;; '(*!dustem_params).G0' $ ; ISRF intensity ;; ,'dustem_plugin_continuum_1' $ ;temperature of blackbody the produces the continuum ;; ] ;; fiv=[1.5, 1200.] ;; ;=== AN EXAMPLE FOR J13 ;; ;=== Here we fit the dust abundances of the J13 model, the ;; ;=== intensity of the dust-heating radiation field as well as two plug-ins: ;; ;=== (i) free-free emission ;; ;=== (ii)continuum due to a blackbody ;; ;=== The temperature of the blackbody is fixed to 1000K ;; ;=== The free parameters in the fit are all lower-bounded at zero. ;; use_model='J13' ; you should specify this above, or in the command line ;; pd = [ $ ;; '(*!dustem_params).G0' $ ;G0 ;; ,'(*!dustem_params).grains(0).mdust_o_mh'$ ;CM20 -- power law size distribution ;; ,'(*!dustem_params).grains(1).mdust_o_mh'$ ;CM20 -- logN size distribution ;; ,'(*!dustem_params).grains(2).mdust_o_mh' $ ;aPyM5 ;; ,'(*!dustem_params).grains(3).mdust_o_mh' $ ;aOlM5 ;; ,'dustem_plugin_freefree_1' $ ;ionized gas temperature ;; ,'dustem_plugin_freefree_2' $ ;free-free amplitude ;; ,'dustem_plugin_continuum_2'] ;Intensity at peak of the BB continuum ;; iv = [1.2,1.7e-3, 6.3e-4, 2.55e-3, 2.55e-3, 7500., 0.4, 0.001] ;; Npar=n_elements(pd) ;; ulimed=replicate(0,Npar) ;; llimed=replicate(1,Npar) ;; llims=replicate(1.e-15,Npar) ;; fpd=[ 'dustem_plugin_continuum_1'] ; Temperature of the BB ;; fiv=[1000.] ;;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 if keyword_set(wait) then begin message,'Finished setting dust model and plug-in parameters: '+use_model,/info wait,wait end ;== INITIALISE DUSTEM dustem_init,model=use_model,polarization=use_polarization !dustem_nocatch=1 !dustem_verbose=use_verbose IF keyword_set(noobj) THEN !dustem_noobj=1 !EXCEPT=2 ; for debugging ;=== READ EXAMPLE SED DATA dir=!dustem_wrap_soft_dir+'/Data/EXAMPLE_OBSDATA/' file=dir+'example_SED_1.xcat' IF keyword_set(sed_file) THEN file=sed_file sed=read_xcat(file,/silent) if keyword_set(wait) then begin message,'Finished reading SED data: '+file,/info wait,wait end ;;=== ADJUST THE UNCERTAINTIES FROM WITHIN THE CODE (FOR ILLUSTRATION) ind=where(sed.sigmaII LT (0.2*sed.StokesI)^2,count) IF count NE 0 THEN sed[ind].sigmaII=(0.2*sed[ind].StokesI)^2 ;== SET THE OBSERVATIONAL STRUCTURE ;== sed is passed twice in the call -- 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 if keyword_set(wait) then begin message,'Finished initializing DustEMWrap, including plugins and fixed parameters',/info wait,wait end ;=== INFORMATION TO RUN THE FIT tol=1.e-16 ;fit tolerence ;=== INFORMATION TO MAKE THE PLOT yr=[1.00e-4,1.00E2] ; y-axis limits xr=[1.00E0,6.00e4] ; x-axis limits tit='FIT INTENSITY EXAMPLE' ; plot title ytit=textoidl('I_\nu (MJy/sr) for N_H=10^{20} H/cm^2') ; y-axis title xtit=textoidl('\lambda (\mum)') ; x-axis title ;=== RUN THE FIT t1=systime(0,/sec) 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,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='./' mydevice=!d.name set_plot,'PS' ; ps_file=dir_ps+postscript ps_file=postscript device,filename=ps_file,/color ENDIF ;stop IF !dustem_noobj THEN BEGIN dustemwrap_plot_noobj,*(*!dustem_fit).CURRENT_PARAM_VALUES,st=dummy,xr=xr,/xstyle,yr=yr,/ysty,/ylog,/xlog,title=tit+' (Final fit)' ENDIF ELSE BEGIN dustemwrap_plot,*(*!dustem_fit).CURRENT_PARAM_VALUES,st=dummy,xr=xr,/xstyle,yr=yr,/ysty,/ylog,/xlog,title=tit+' (Final fit)' ENDELSE IF keyword_set(postscript) THEN BEGIN device,/close set_plot,mydevice 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) THEN BEGIN message,'Writing out results structure: '+fits_save,/info dustem_write_fits_table,filename=fits_save,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 ;=== Moved the following to dustem_fits_io_example ;; dustem_read_fits_table,filename=fits_save,dustem_st=dustem_spectra_st ;; ;stop ;; ;!dustem_show=ptr_new(*!dustem_data) ;test ;; !dustem_noobj=1 ;; ;==== plot result taken from the saved fits table ;; res=*(*!dustem_fit).CURRENT_PARAM_VALUES ;; IF !dustem_noobj THEN BEGIN ;; ;dustemwrap_plot_noobj,res,st=dustem_spectra_st,xr=xr,/xstyle,yr=yr,/ysty,/ylog,/xlog,title=tit+' (From Saved FITS file)' ;; dustemwrap_plot_noobj,res,xr=xr,/xstyle,yr=yr,/ysty,/ylog,/xlog,title=tit+' (From Saved FITS file)' ;; ENDIF ELSE BEGIN ;; ;dustemwrap_plot,res,st=dustem_spectra_st,xr=xr,/xstyle,yr=yr,/ysty,/ylog,/xlog,title=tit+' (From Saved FITS file)' ;; dustemwrap_plot,res,xr=xr,/xstyle,yr=yr,/ysty,/ylog,/xlog,title=tit+' (From Saved FITS file)' ;; ENDELSE ;; ;stop IF keyword_set(wait) THEN BEGIN message,'Saved the results as FITS in the file: '+fits_save,/info wait,wait ENDIF ENDIF the_end: message,'Finished dustem_fit_intensity_example',/info END