Kaufman, Wolfire, Hollenbach, & Luhman 1999, ApJ
Standard Model Parameters

Parameter Symbol Value

$$\delta v_D \,\rm km\,s^{-1}$$ Turbulent Doppler Velocity

$$^{\rm a} 1.4\times 10^{-4}$$ X_C

$$^{\rm a} 3.0\times 10^{-4}$$ X_O

$$^{\rm a} 1.7\times 10^{-6}$$ X_Si

$$^{\rm a} 2.8\times 10^{-5}$$ X_S

$$^{\rm a} 1.7\times 10^{-7}$$ X_Fe

$$^{\rm a} 1.1\times 10^{-6}$$ X_Mg

$$\delta_d$$ Dust abundance relative to diffuse ISM 1

$$\delta_{UV}$$ FUV Dust absorption/visual extinction 1.8

$$\sigma_{\rm V} 5\times 10^{-22}\,\rm cm^{2}$$ Dust visual cross section per H

$$\rm H_2 ^{\rm b} 3\times 10^{-17}\,\rm s^{-1}$$ R_form

$$X_{\rm PAH}=n_{\rm PAH}/n 4\times 10^{-7}$$ PAH abundance

$$10^1\,{\rm cm^{-3}}\le\,n\,\le\, 10^7\,{\rm cm^{-3}}$$ Cloud density n

$$10^{-0.5}\,\le\,G_0\,\le\, 10^{6.5}$$ Incident FUV flux G₀

$^{\rm a}$Gas phase abundances relative to H nuclei from Savage & Sembach 1996

$^{\rm b}$Rate cm^-3 s^-1 given by $R_{form}n_{\rm HI}$

WITS

PDRT

DIRT

UMD

IRSA

Please direct comments, criticisms, corrections and contributions to Marc Pound.
Page last modified: Tuesday, 10-Jun-2003 14:24:38 EDT.