HyGAL: Characterizing the Galactic ISM with observations of hydrides and other small molecules - II. The absorption line survey with the IRAM 30 m telescope

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Table 3

Coefficients from linear regression fits.

Source	HCO⁺		HCN		HNC		CS		H₂S		C₂H		c-C₃H₂

	A	B	A	B	A	B	A	B	A	B	A	B	A	B
W3 IRS5	0.977	−0.225	0.963	−0.199	0.942	−0.218		…	…	…	0.944	−0.217	0.800	−0.128
W3(OH)	1.163	−0.441	0.960	−0.281	0.856	−0.280		…	…	…	0.869	−0.168	0.620	0.005
NGC 6334 I	0.605	−2.148	0.716	−2.538	0.670	−2.438	…	…	…	…	0.454	−1.577	0.520	−1.904
HGAL0.55–0.85	…	…	…	…	…	…	…	…	…	…	…	…	…	…
G09.62+0.19	0.987	−1.133	1.033	−1.188	1.015	−1.145	…	…	…	…	0.486	−0.539	0.156	−0.126
G10.47+0.03	1.013	−0.047	1.037	−0.043	0.896	−0.014	…	…	…	…	0.907	−0.033	0.907	−0.021
G19.61−0.23	1.049	0.867	1.050	0.862	1.024	0.887	…	…	…	…	0.889	0.836	0.819	0.807
G29.96−0.02	0.976	−0.681	0.969	−0.663	0.942	−0.644	0.580	−0.235	0.112	−0.028	0.922	−0.633	0.928	−0.655
W43 MM1	0.626	−0.185	0.749	−0.229	0.628	−0.185	0.763	−0.038	0.700	0.184	0.809	−0.264	0.891	−0.288
G31.41+0.31	1.018	0.098	1.042	0.089	0.902	0.099	0.977	−0.117	0.942	−0.228	1.029	0.080	1.074	0.073
G32.80+0.19	1.075	−0.015	1.072	−0.005	1.100	−0.323	0.931	0.212	0.592	0.421	1.080	−0.287	1.031	−0.238
G45.07+0.13	0.946	0.193	0.906	0.184	0.260	0.199	…	…	…	…	0.930	0.212	0.625	0.220
DR21	0.847	−0.322	0.851	0.293	0.919	−0.505	…	…	…	…	0.906	0.220	1.010	−0.306
NGC 7538 IRS1	0.761	0.224	0.932	0.238	0.536	0.283	…	…	…	…	0.761	0.225	0.278	0.342

Notes. The coefficients A and B refer to the slope and y-intercept of a linear least-square regression fit. The molecular transitions with blank A and B values correspond to WSw mode-only observations with noncontaminated WSw off positions.

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