Infrared view of the multiphase ISM in NGC 253 - II. Modelling the ionised and neutral atomic gas

Open Access

Table 1.

Definition of the different values of the cut parameter, ξ, in the SFGX grid.

ξ	Condition	Note
0		Illuminated edge of the cloud
1	n(H⁺)/n(H⁰) = 1.0	Ionisation front
2	n(H⁰)/n(H₂) = 1.0	Hydrogen photodissociation front
3	n(C⁰)/n(CO) = 1.0	CO photodissociation front ^(a)
4	A_V = 10	Full depth

Notes. There are tabulated decimal values between the ξ values.

^(a)

In some models – in particular ones with large X-ray luminosities or high CRIRs that keep the ISM warm – the CO photodissociation front is not reached within the Cloudy simulation.

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