dustem_compute_stokes.pro
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FUNCTION dustem_compute_stokes,p_dim,$
st=st,$
Q_spec=Q_spec,$
U_spec=U_spec,$
PSI_spec=PSI_spec,$
dustem_psi_em=dustem_psi_em,$
help=help
;+
; NAME:
; dustem_compute_stokes
; PURPOSE:
; Computes Stokes Parmeters SEDs for a given Dustem spectrum
; CATEGORY:
; Dustem
; CALLING SEQUENCE:
; out=dustem_compute_stokes(p_dim[,st][,Q_spec][,U_spec][,PSI_spec][,dustem_psi_em]
; INPUTS:
; p_dim = parameter values
; OPTIONAL INPUT PARAMETERS:
; st = Dustem structure
; OUTPUTS:
; out = List Containing the Stokes parameters emission for spectrum points in !dustem_data
; out[0] = Computed Stokes Q emission for spectrum points in !dustem_data
; out[1] = Computed Stokes U emission for spectrum points in !dustem_data
; OPTIONAL OUTPUT PARAMETERS:
; st = Dustem output structure
; Q_spec = Dustem Stokes Q emission
; U_spec = Dustem Stokes U emission
; PSI_spec = Dustem Polarization angle output in emission
; dustem_psi_em = Computed Polarization angle ouput for spectrum points in !dustem_data
; ACCEPTED KEY-WORDS:
; help = If set, print this help
; COMMON BLOCKS:
; None
; SIDE EFFECTS:
; None
; RESTRICTIONS:
; The dustem idl wrapper must be installed
; PROCEDURE:
; None
; EXAMPLES
;
; MODIFICATION HISTORY:
; Written by J.-Ph. Bernard
; 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_compute_stokes'
out=0.
goto,the_end
ENDIF
IF not keyword_set(st) THEN BEGIN
dustem_activate_plugins,p_dim/(*(*!dustem_fit).param_init_values),st=st
ENDIF
;If keyword_set(result) THEN result=st
fact = 1.e4*(*!dustem_HCD)/(4.*!pi)/(3.e8/1.e-6/(st.polsed).wav)*1.e20/1.e7
stI = st.sed.em_tot * fact ;This is Total intensity I
P = st.polsed.em_tot * fact ;This is Polarized intensity P
Nwaves=(size(stI))[1]
frac=P/stI
tes=where(finite(frac) eq 0)
frac(tes)=0.
scopes=tag_names((*!dustem_plugin))
IF scopes[0] NE 'NONE' THEN BEGIN
FOR i=0L,n_tags(*!dustem_plugin)-1 DO BEGIN
IF total(strsplit((*(*!dustem_plugin).(i).scope),'+',/extract) EQ 'REPLACE_POLSED') THEN BEGIN
Q_spec = (*(*!dustem_plugin).(i).spec)[*,1]
U_spec = (*(*!dustem_plugin).(i).spec)[*,2]
ENDIF
ENDFOR
ENDIF
IF ~isa(Q_spec) && ~isa(U_spec) THEN BEGIN
polar_ippsi2iqu,stI,Q_spec,U_spec,frac,replicate(!dustem_psi,Nwaves);
ENDIF
IF scopes[0] NE 'NONE' THEN BEGIN
FOR i=0L,n_tags(*!dustem_plugin)-1 DO BEGIN
IF total(strsplit((*(*!dustem_plugin).(i).scope),'+',/extract) EQ 'ADD_POLSED') THEN BEGIN
Q_spec+=(*(*!dustem_plugin).(i).spec)[*,1]
U_spec+=(*(*!dustem_plugin).(i).spec)[*,2]
ENDIF
ENDFOR
ENDIF
;-----------------------------------------
ind=where(finite(U_spec) NE 1 OR finite(Q_spec) NE 1,count)
IF count NE 0 THEN BEGIN
message,'Q or U is NaN',/continue
stop
ENDIF
;Hard-coded block so that atan(U,Q) does not return wrong values when Q eq -0
testnzero = where(Q_spec EQ -0., ct_nzero)
if ct_nzero ne 0 then Q_spec[testnzero] = 0
testnzero = where(U_spec EQ -0., ct_nzero)
if ct_nzero ne 0 then U_spec[testnzero] = 0
PSI_spec = 0.5*atan(U_spec,Q_spec)/!dtor
;polar_iqu2ippsi,stI,Q_spec,U_spec,p_bidon,PSI_spec ;same but this line runs several commands for each iteration of this current procedure
;INITIALIZING THE STOKES SEDS
dustem_qsed = (*(*!dustem_data).qsed).values * 0.
dustem_used = (*(*!dustem_data).used).values * 0.
;using a list because the arrays can have different dimensions
;this doesn't change anything ...
out=list(fltarr(n_elements(dustem_qsed)),fltarr(n_elements(dustem_used)))
if not isarray(stI) THEN stop ; I don't get this test. It is unnecessary.
;Performing color corrections on the dustem spectra and generating the SEDs at the given filters
IF !dustem_do_cc NE 0 AND !dustem_never_do_cc EQ 0 THEN BEGIN
message,'DOING color correction calculations',/info
ENDIF ELSE BEGIN
message,'SKIPPING color correction calculations',/info
ENDELSE
ind_qsed=where((*(*!dustem_data).qsed).filt_names NE 'SPECTRUM',count_qsed)
ind_used=where((*(*!dustem_data).used).filt_names NE 'SPECTRUM',count_used)
IF count_qsed NE 0 THEN BEGIN
filter_names=((*(*!dustem_data).qsed).filt_names)[ind_qsed]
if isa(dustem_qsed) then begin
sqsed=dustem_cc(st.polsed.wav,Q_spec,filter_names,cc=cc)
dustem_qsed[ind_qsed]=sqsed
endif
ENDIF
IF count_used NE 0 THEN BEGIN
filter_names=((*(*!dustem_data).used).filt_names)[ind_used]
if isa(dustem_used) then begin
sused=dustem_cc(st.polsed.wav,U_spec,filter_names,cc=cc)
dustem_used[ind_used]=sused
endif
ENDIF
;For spectrum data points, interpolate in log-logdustem_compute_stokes.pro
;Linear interpolation leads to wrong values, in particular where few
;wavelengths points exist in the model (long wavelengths).
ind_qspec=where((*(*!dustem_data).qsed).filt_names EQ 'SPECTRUM',count_qspec)
ind_uspec=where((*(*!dustem_data).used).filt_names EQ 'SPECTRUM',count_uspec)
IF count_qspec NE 0 THEN BEGIN
if isa(dustem_qsed) then dustem_qsed[ind_qspec]=interpol(Q_spec,st.polsed.wav,(((*(*!dustem_data).qsed).wav)[ind_qspec]))
ENDIF
IF count_uspec NE 0 THEN BEGIN
if isa(dustem_used) then dustem_used[ind_uspec]=interpol(U_spec,st.polsed.wav,(((*(*!dustem_data).used).wav)[ind_uspec]))
ENDIF
;generating interpolates for Psi_em
dustem_psi_em = 0.5*atan(dustem_used,dustem_qsed)/!dtor
out[0]=dustem_qsed
out[1]=dustem_used
;clean pointers
heap_gc
the_end:
RETURN,out
END