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

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Table 7

Physical parameters of single-component fitting in the central 18′′ region, with < 1.5.

Parameters	Min	Max	Best fitting

	0.5	1.5	0.5
Log(Density) [cm^-3]	2.7	3.8	3.2
Temperature [K]	80	400	200
dν/dr [kms^-1 pc^-1]	1.0	25	3.0
N(CO)_model^a[10¹⁹ cm^-2]	3.1	7.8	4.9
N(CO)_beam^b[10¹⁷ cm^-2]	5.7	17	9.2
N(H₂)_beam^c[10²¹ cm^-2]	7.1	21	11.5
M_H₂^d[10⁷M_⊙]	0.7	2.2	1.3
Area Filling Factor (φ_A)	1.8%	2.3%	1.9%

Notes.

^(a)

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

^(b)

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

^(c)

N(H₂)_beam is the beam average H₂ column density.

^(d)

M(H₂) is the molecular gas mass within a beam size of 18′′, using ), where r is the radius of the beam, 180 pc, andx_CO is the CO to H₂ abundance, 8 × 10^-5 (Frerking et al. 1982). The helium mass is included in M(H₂). We also examined the molecular gas mass using a R₁₂₁₃ of 89, which gives a range from 0.7 × 10⁷M_⊙ to 2.6 × 10⁷M_⊙, and the best-fit molecular gas mass is 1.7 × 10⁷M_⊙.

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