HyGAL: Characterizing the Galactic ISM with observations of hydrides and other small molecules - II. The absorption line survey with the IRAM 30 m telescope

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Table 10

Input parameters of the Meudon PDR isobaric models.

Fixed parameters

Oxygen abundance	3.2 10⁻⁴
Carbon abundance	1.3 × 10⁻⁴
Nitrogen abundance	7.5 × 10⁻⁵
Sulfur abundance	1.9 × 10⁻⁵
R_v = A_v/E(B − V)	3.1
Gas to Dust ratio	100
Grain size distribution index	3.5
Minimum grain radius (µm)	0.003
Maximum grain radius (µm)	0.3

Free parameters

Radiation field G₀	1 & 100
Cosmic ray ionization rate ζ (s−¹)	5 × l0⁻¹⁷, 10⁻¹⁶ & 10⁻¹⁵
A_v,_max (mag)	0.1, 1, 5 & 10
Pressure (K cm⁻³)	10³, 3 × 10³, 5 × 10³ & 10⁴

Notes. The carbon and sulfur atoms are in their ionized form in the chemical file. The UV interstellar radiation field is in Mathis unit; G₀ = 1 corresponds to a flux of 3.03 × 10⁻⁴ ergs cm⁻²s⁻¹.

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