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

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Table 6.

Galaxy centers: molecular line ratios.

NGC	HCO⁺/HCN					HNC/HCN		HCN/CO	HCN			HNC	HCO⁺

	1−0	2−1 ^(a)	3−2	3−2	4−3	1−0	3−2	1−0/1−0	2−1/1−0 ^(b)	3−2/1−0	4−3/1−0	3−2/1−0	3−2/1−0	4−3/1−0
	27.6″	34.7″	9.7″	19.0″	13.7″	27.6″	19″	22″	22″	22″	22″	22″	22″	22″
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)	(11)	(12)	(13)	(14)	(15)
253	0.85	...	0.93	0.81	1.21 ^(c)	0.52	0.45	0.085	...	0.80	0.51	0.69	0.74	0.59
520	1.46	...	...	1.27	...	0.61	...	0.025	...	0.60	0.53	...	...	...
660	0.78	...	0.63	1.03	1.04 ^(d)	0.45	0.34	0.060	0.69	0.43	0.23	0.32	0.63	...
891	1.02	...	0.68	0.82	...	0.34	...	0.014	...	0.82	...	...	0.69	...
972	1.17	...	...	0.4:	...	0.46	...	0.029	...	0.76	...	...	0.18	...
1055	0.60	...	...	0.3:	...	0.34	...	0.037	...	0.50	...	...	0.24	...
Maf2	0.62	...	0.77	...	0.92	0.47	0.47	0.106	0.52	0.32	0.10	0.32	0.43	...
1068	0.59	0.74	0.40	0.38	0.46 ^(c)^,^(d)	0.40	0.29	0.195	0.46	0.41	0.27	0.32	0.26	0.20
1084	0.87	...	...	0.68	...	0.39	0.2:	0.028	...	...	...	...	...	...
1097	0.72	...	...	0.75	...	0.33	...	0.082	...	0.49	...	...	0.53	...
I342	0.78	...	0.90	1.43	1.41 ^(c)	0.59	0.42	0.091	0.20	0.10	0.40	0.14	0.25	...
1365	0.82	0.74	0.81	...	1.11 ^(c)^,^(d)	0.51	0.39	0.072	...	0.47	...	0.36	0.48	...
1808	0.94	1.04	...	...	0.96 ^(c)^,^(d)	0.41	...	...	...	...	...	...	...	...
2146	1.44	...	1.18	...	...	0.40	0.5:	0.033	0.70	0.70	0.72	...	0.54	...
2559	1.07	...	...	...	...	0.35	...	0.046	...	0.65	...	...	...	...
2623	1.06	...	1.54	...	...	...	0.99	0.137	...	0.72	0.48	...	1.5	...
2903	0.54	...	...	0.86	...	0.37	...	0.052	...	0.41	...	...	0.66	...
3034	1.39	...	1.26	2.03	2.72 ^(c)	0.41	0.27	0.052	0.40	0.32	0.13	0.21	0.52	0.33
3079	0.86	...	1.03	0.89	1.10	0.91	0.2:	0.040	...	0.61	0.20	...	0.61	0.23
3627	1.05	...	...	...	0.88 ^(d)	0.28	0.3:	0.038	...	0.68	...	...	...	...
3628	1.05	1.34	1.44	...	2.78 ^(d)	0.64	...	0.037	...	0.46	0.27	...	0.62	...
3690	1.44	...	2.99	...	...	0.36	...	0.048	...	0.27	0.10	...	0.63	...
4030	0.51	...	0.45	...	...	0.53	...	0.105	...	0.29	0.27	...	0.27	...
4038	1.37	...	1.68	1.52	...	0.44	...	0.072	...	0.29	0.34	...	0.31	...
4102	0.61	...	0.55	...	...	0.75	...	0.064	...	0.37	...	...	0.38	...
4321	0.65	...	0.69	...	...	0.33	...	0.075	...	0.34	0.23	...	0.38	...
4414	0.71	...	...	...	...	0.27	...	0.091	...	0.22	...	...	...	...
4527	0.90	...	0.98	...	...	0.45	...	0.046	...	0.30	...	...	0.35	...
4569	0.78	...	0.89	...	...	0.23	...	0.054	0.21	0.12	0.06	...	0.19	...
4666	0.65	...	0.3:	...	...	0.62	...	0.040	...	0.16	0.21	...	0.10	...
4826	0.62	...	0.75	...	...	0.42	0.68	0.099	0.28	0.22	0.15	0.36	0.13	...
5033	0.74	...	...	0.5:	...	0.84	...	0.024	...	0.94	...	...	0.52	...
5055	0.55	...	...	...	...	0.27	...	0.046	...	0.24	0.12	...	...	...
5194	0.47	...	0.6:	...	...	0.38	0.4:	0.198	0.15	0.13	0.10	...	0.20	...
5236	1.22	...	...	...	1.14 ^(c)	0.50	0.34	0.054	...	0.33	...	...	...	0.16
5775	0.94	...	0.5:	...	...	0.19	...	0.032	...	...	...	...	...	...
6240	1.68	1.36	0.92	0.4:	1.65 ^(d)	0.21	...	0.080	1.00	0.75	0.58	...	0.14	...
6701	1.02	...	0.95	0.76	...	0.41	...	0.052	...	0.39	0.44	0.44	0.67	...
6946	0.85	...	0.93	0.83	3.21 ^(d)	0.40	0.51	0.057	0.41	0.25	0.06	0.31	0.23	...
6951	0.74	...	1.13	1.15	...	0.56	0.59	0.071	0.87	0.28	...	0.30	0.45	...
7469	1.05	...	0.75	0.75	...	0.52	0.5:	0.060	...	0.57	0.18	...	0.41	...
7771	1.05	...	0.60	2.08	...	0.43	1.02	0.081	...	0.12	...	0.28	0.31	...
A220	0.46	...	0.25	...	0.76	0.96	...	0.089	...	1.18	0.31	...	0.71	0.21

MW ^(e)	0.60	...	...	...	...	0.30	...	0.10	...	...	...	...	...	...

Ave	0.90	1.1	0.95	1.06	1.42	0.46	0.52	0.046	0.49	0.41	0.27	0.34	0.42	0.29
	±0.05	±0.2	±0.10	±0.11	±0.21	±0.03	±0.07	±0.006	±0.08	±0.04	±0.04	±0.05	±0.03	±0.07
MD ^(f)	0.30	0.40	0.52	0.47	0.82	0.17	0.24	0.039	0.27	0.25	0.18	0.16	0.19	0.16
Err ^(g)	0.05	0.15	0.15	0.2	0.3	0.05	0.15	0.15	0.3	0.2	0.3	0.2	0.15	0.3

Notes.

^(a)

Based on APEX 12 m observations by Zhou et al. (2022).

^(b)

Based on IRAM observations (HPBW 14″) by Krips et al. (2008).

^(c)

Includes JCMT observations by Tan et al. (2018).

^(d)

From APEX 12 m observations (HPBW 18″) by F. P. Israel (unpublished) and by Zhang et al. (2014).

^(e)

Milky Way Circumnuclear Molecular Zone values from MOPRA 22 m observations (effective resolution 39″) by Jones et al. (2012).

^(f)

Mean deviation of sample.

^(g)

Logarithm of typical observational error of ratios plotted in Figs. 3–11; individual errors vary depending on observed intensity (cf. Table 3).

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