dustem_mathis_field.pro
2.21 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
FUNCTION DUSTEM_MATHIS_FIELD, x, unit=unit, help=help
;+
; NAME:
; dustem_mathis_field
;
; PURPOSE:
; Returns the Mathis interstellar radiation field SED (ISRF) in W/m2 (4*!pi*nu*I_nu)
; from Mathis et al. 1983, A&A 128, 212
;
; CATEGORY:
; DustEMWrap, Distributed, LowLevel, Helper
;
; CALLING SEQUENCE:
; mathis = DUSTEM_MATHIS_FIELD(x,unit=unit)
;
; INPUTS:
; x : wavelength grid for the ISRF (1D array)
;
; OPTIONAL INPUT PARAMETERS:
; UNIT: unit of the ISRF. Choices are
; 'W': wave in um [Default]
; 'F': frequency in cm-1
; 'E': energy in eV
;
; OUTPUTS:
; ISRF : the Mathis isrf as 1d vector in requested units
;
; OPTIONAL OUTPUT PARAMETERS:
;
; ACCEPTED KEY-WORDS:
; help = print this help
;
; COMMON BLOCKS:
; None
;
; SIDE EFFECTS:
;
; RESTRICTIONS:
;
; PROCEDURES AND SUBROUTINES USED:
;
; EXAMPLES
; wavs=3.+findgen(3000) ; wavelenghts 3 to 3003um
; isrf = DUSTEM_MATHIS_FIELD(wavs,unit='W')
;
; MODIFICATION HISTORY:
; Written by LV 2009
; Initially distributed with the Fortran, incorporated into DustEMWrap 2022
; 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_mathis_field'
field=0
goto,the_end
ENDIF
if n_elements( UNIT ) EQ 0 then unit = 'W' $
else unit = strupcase( strcompress( unit,/rem) )
ly_limit = 9.11267101235d-2
x = double( x )
;
; visible part
;
wdil = 4.d0 * [ 4.d-13, 1.d-13, 1.d-14] ; Mathis definition
; 4*!pi*Wdil*B_nu
field = !pi * x * DUSTEM_BLACKBODY( x, [ 3.d3, 4.d3, 7.5d3 ], wdil=wdil, unit=unit )
;
; UV part
;
; first convert to (lambda / 1e3 AA)
CASE unit of
'W': x3 = 1.d1 * x
'F': x3 = 1.d5 / x
'E': x3 = 12.4 / x
ENDCASE
il = where( x3 LE 2.46, cl )
if cl GT 0 then field(il) = 0.D0
il = where( x3 GE 1d1*ly_limit AND x3 LT 1.11, cl )
if cl GT 0 then field(il) = 1.4817d-6 * x3(il)^(4.4172)
il = where( x3 GE 1.11 AND x3 LT 1.34, cl )
if cl GT 0 then field(il) = 2.0456d-6 * x3(il)
il = where( x3 GE 1.34 AND x3 LT 2.46, cl )
if cl GT 0 then field(il) = 3.3105d-6 * x3(il)^(-0.6678)
the_end:
RETURN, field
END ;FUNCTION DUSTEM_MATHIS_FIELD