Radiative and mechanical feedback into the molecular gas of NGC 253

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Table 3

Model parameters for the three PDR phases.

Component	Density log(n_H)	log(G₀)	log(N_CO)	log(N_CO)	Ω ^a	C _em ^b	C _{N _CO} ^c	Mass _{N_H₂} ^d
	log[cm^-3]		log[cm^-2]	log[cm^-2]			M _⊙	M _⊙

PDR I	3.5	2.5	17.1	21.5	10.0	0.04	0.28	9 × 10⁷
PDR II	5.0	2.5	17.5	21.5	10.0	0.34	0.71	9 × 10⁷
PDR III	5.5	5.5	16.0	21.2	1.5	0.62	<0.01	7 × 10⁶

Notes.

^(a)

Ω is the beam filling factor for each ISM phase.

^(b)

C_em is the fractional contribution of each ISM phase to the emission.

^(c)

C_{N_CO} is the fractional contribution of each ISM phase to the CO column density.

^(d)

Mass_{N_H₂} is the mass of each ISM phase as estimated by the column density using Eq. (4).

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