Physical conditions of molecular gas in the Circinus galaxy Multi-J CO and Ci 3PP0 observations

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Table 9

Physical parameters of two-component fitting in the central 45′′ region.

Parameter	Low-excitation component			High-excitation component

	min	max	best fitting	min	max	best fitting

Density [cm^-3]	10^2.8	10^3.5	10^3.0	10^3.3	10^5.3	10^4.2
Temperature [K]	20	80	30	40	400	60
dv/dr [kms^-1 pc^-1]	5	25	6	3	300	50
N(CO)_beam [10¹⁷ cm^-2]^a	2.7	5.0	3.9	0.9	2.3	1.4
N(CO)_model [10¹⁹ cm^-2]^b	0.9	1.5	1.2	1.5	4.6	2.3
M_H₂ [10⁷M_⊙]^c	4.3	8.6	6.6	1.2	4.0	2.3
Filling Factor	2.6%	4.4%	3.3%	0.44%	0.82%	0.58%

Notes.

^(a)

N(CO)_beam is the CO column density diluted by the filling factor (φ_A).

^(b)

N(CO)_model is the CO column density derived in the LVG models.

^(c)

M_H₂ is calculated with the beam size of 45′′, using ), where r is the radius of the beam, 450pc.x_CO is the CO to H₂ abundance ratio, 8 × 10^-5 (Frerking et al. 1982). The helium mass is included in M_H₂.

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