dustem_plugin_modify_dust_pol.pro
2.93 KB
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FUNCTION dustem_plugin_modify_dust_pol, key=key, val=val, scope=scope, paramtag=paramtag, help=help
;+
; NAME:
; dustem_plugin_modify_dust_pol
; PURPOSE:
; modifies stokes Q,U values for dust polarization in st according to the given keywords and values
; CATEGORY:
; DUSTEM Wrapper
; CALLING SEQUENCE:
; a=dustem_plugin_modify_dust_pol(st,[key=][val=][,scope=][,paramtag=][,/help])
; INPUTS:
; st = dustem structure
; OPTIONAL INPUT PARAMETERS:
; key = input parameter numbers (first = polarization fraction in %, default=1.%, second=polarization angle, default=0.)
; val = input parameter values
; OUTPUTS:
; out = array containing the stokes emission parameters associated to the dust/synchrotron component or a concatenated version for both
; OPTIONAL OUTPUT PARAMETERS:
; scope = if set, returns only the scope of the pluggin
; paramtag = if set, returns only the parameter tags
; ACCEPTED KEY-WORDS:
; 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:
; This is a dustem plugin
;-
IF keyword_set(help) THEN BEGIN
doc_library,'dustem_plugin_modify_dust_pol'
out=0.
GOTO,the_end
ENDIF
st=*!dustem_current
IF keyword_set(scope) THEN BEGIN
out=0.
GOTO, the_scope
ENDIF
IF keyword_set(paramtag) THEN BEGIN
out=0.
GOTO, the_paramtag
ENDIF
;below are the default values for the plugin parameters
smallp_fact=1. ;This is the default multiplicative factore to the dust polarization
psi=0. ;This is the default polarization angle
IF keyword_set(key) THEN BEGIN
ind1=where(key EQ 1,count1)
ind2=where(key EQ 2,count2)
IF count1 NE 0 THEN smallp_fact=val[ind1[0]] ; setting smallp from pd - this is another polarization fraction (constant) that is applied to the total dust emission
IF count2 NE 0 THEN psi=val[ind2[0]] & !dustem_psi = psi ; setting psi from pd. !dustem_psi here helps for the plotting.
ENDIF
fact = 1.e4*(*!dustem_HCD)/(4.*!pi)/(3.e8/1.e-6/((st.polsed).wav))*1.e20/1.e7
P=((st.polsed).em_tot)*fact ; This is the polarized emission P
I=((st.sed).em_tot)*fact ; This is the total intensity emission I
Nwaves=(size(I))[1]
;0/0 division in frac
;since we divide by I we only need to avoid its null indices
indI = where(I ne 0, countI)
if countI ne 0 then frac_model = P*0. & frac_model[indI] = P[indI]/I[indI] ;This is the polarization fraction in the model
frac_used=frac_model*smallp_fact
psi_used = replicate(psi,Nwaves)
polar_ippsi2iqu,I,Q,U,frac_used,psi_used
out=fltarr(Nwaves,3) ; modified this. This is the only plugin that has this number of outputs.
;degtorad = !pi/180
out[*,0]=I
out[*,1]=Q
out[*,2]=U
; out[*,3]=frac_used
; ;out[*,4]=0.5*atan(U,Q)/degtorad
; out[*,4]=psi_used
the_scope:
scope='REPLACE_POLSED'
the_paramtag:
paramtag=['p','Psi (deg)']
RETURN, out
the_end:
END