Central molecular zones in galaxies: Multitransition survey of dense gas tracers HCN, HNC, and HCO+

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Table 7.

Line transition ratios as a function of CO luminosity.

log L(CO) ^(a)	HCN ^(b)			HCO⁺ ^(b)
(K km s⁻¹)	(2−1)/(1−0)	(3−2)/(1−0)	(4−3)/(1−0)	(3−2)/(1−0)
(1)	(2)	(3)	(4)	(5)
7.4	0.31 (5)	0.25 (9)	0.16 (6)	0.32 (6)
8.3	0.53 (5)	0.41 (16)	0.26 (9)	0.37 (14)
8.8	...	0.68 (14)	0.42 (4)	0.45 (3)
9.3	...	0.35 (9)	0.30 (4)	0.45 (10)
9.9	...	0.67 (6)	...	0.61 (7)
7.0−9.0 ^(c)	0.49 (12)	0.40 (29)	0.26 (19)	0.37 (23)
7.0−10.0 ^(c)	...	0.43 (44)	0.27 (24)	0.43 (40)

Notes.

^(a)

Center of luminosity interval considered.

^(b)

Number of points in interval is given between parentheses; entries for intervals with only one point are deleted.

^(c)

Range considered for overall average.

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