dustem_plugin_freefree.pro
2.95 KB
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FUNCTION dustem_plugin_freefree,key=key,val=val,scope=scope,paramtag=paramtag,help=help
;+
; NAME:
; dustem_plugin_freefree
; PURPOSE:
; DUSTEM plugin to compute free-free emission
; CATEGORY:
; DUSTEM Wrapper
; CALLING SEQUENCE:
; freefree=dustem_plugin_freefree([,key=][,val=])
; INPUTS:
; None
; OPTIONAL INPUT PARAMETERS:
; key = input parameter number
; val = input parameter value
; OUTPUTS:
; freefree = free-free spectrum (on dustem wavelengths)
; OPTIONAL OUTPUT PARAMETERS:
; scope = scope of the plugin
; ACCEPTED KEY-WORDS:
; help = if set, print this help
; COMMON BLOCKS:
; None
; SIDE EFFECTS:
; None
; RESTRICTIONS:
; None
; PROCEDURE:
; This is a dustem plugin
; EXAMPLES
; dustem_init
; vec=dustem_plugin_freefree(scope=scope)
; MODIFICATION HISTORY:
; Written by JPB
;-
IF keyword_set(help) THEN BEGIN
doc_library,'dustem_plugin_freefree'
output=0.
goto,the_end
ENDIF
;default values of input parameters
Tgas=10000. ;default gas temperature
Amplitude=1. ;Amplitude
paramtag=['T_gas (K)','Amp']
IF keyword_set(key) THEN BEGIN
a=where(key EQ 1,count1)
b=where(key EQ 2,count2)
IF count1 NE 0 then Tgas=(val(a))(0)
IF count2 NE 0 then Amplitude=(val(b))(0)
ENDIF
;IF !dustem_which EQ 'DESERT' THEN BEGIN
; lambir=((*!dustem_params).gemissiv.lambir)
;ENDIF ELSE BEGIN
; lambir=((*!dustem_params).lambda.lambda)
;ENDELSE
;replaced by the following to ease the life of plugins writters
lambir=dustem_get_wavelengths()
cmic=3.e14
nu=cmic/lambir ;Hz
mjy=1 ;output is in MJy/sr
lambir_ref=10000.
;stop
use_method='Deschenes2008'
;use_method='WallsGabaud1998'
;use_method='Dickinson2003_norm'
CASE use_method OF
'WallsGabaud1998':BEGIN
em=1. ;This is a stupid value for the Emission measure. Result will be rescaled based on I_halpha_R anyway
output=intensity_free_free(nu,Tgas,em,I_halpha_R=I_halpha_R,nHe=nHe,ergs=ergs,mjy=mjy)
fact=Amplitude/I_halpha_R
;=== normalize to the requested Halpha value.
output=output*fact
END
'WallsGabaud1998_scaled':BEGIN
em=1. ;This is a stupid value for the Emission measure. Result will be rescaled based on I_halpha_R anyway
output=intensity_free_free(nu,Tgas,em,I_halpha_R=I_halpha_R,nHe=nHe,ergs=ergs,mjy=mjy)
norm=interpol(output,lambir,lambir_ref)
output=output/norm*Amplitude
END
'Deschenes2008':BEGIN
beta_freefree=2.+1./(10.48+1.5*alog(Tgas/8.e3)-alog(nu/1.e9))
output=nu^(-1.*beta_freefree)
norm=interpol(output,lambir,lambir_ref)
output=output/norm*Amplitude
END
'Dickinson2003_norm':BEGIN
;stop
em=1.
T4=Tgas/1.e4
nu_ghz=nu/1.e9
a=0.366*(nu_ghz/1.e9)^(-0.15)*(alog(4.995*1e-2*(nu_ghz)^(-1.))+1.5*alog(Tgas))
Tb=8.369e3*a*(nu_ghz)^(-2.)*T4^0.667*10^(0.029*T4)*(1.+0.08) ;in mK for 1 Rayleigh
convert_mk_mjy, lambir, Tb, I_Mjy, /RJ
norm=interpol(I_Mjy,lambir,lambir_ref)
output=I_Mjy/norm*Amplitude
END
ENDCASE
scope='ADD_SED'
the_end:
RETURN,output
END