Isotopic ratios at z = 0.68 from molecular absorption lines toward B 0218+357

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Volume 595 (November 2016)

A&A, 595 (2016) A96

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Table A.2

Observed transitions.

Line	Rest freq.	Redshifted	Integrated	Channel rms noise^c	α^d	Ncol^e
	(GHz)^a	freq. (GHz)^b	opacity (km s^-1)	(%)	(10¹² cm^-2 km^-1 s)	(10¹² cm^-2)

HCO⁺J = 2–1	178.3750563	105.8819	–	0.75	1.99	–
H¹³CO⁺J = 2–1	173.5067003	102.9921	1.000(0.098)	0.29	2.00	2.0 (0.2)
HC¹⁸O⁺J = 2–1	170.3226261	101.1021	0.459(0.055)	0.63	2.02	0.9 (0.1)
HC¹⁷O⁺J = 2–1	174.1131691	103.3521	–	0.40	2.00	–
HCN J = 2–1	177.2611112	105.2207^f	–	0.83	3.39	–
H¹³CN J = 2–1	172.6778512	102.5001^f	0.842(0.064)	0.42	3.41	2.9 (0.2)
HC¹⁵N J = 2–1	172.1079570	102.1618	0.276(0.035)	0.41	3.43	0.9 (0.1)
CS J = 3–2	146.9690287	87.2396	2.471(0.225)	0.44	17.6	44 (4.0)
C³⁴S J = 3–2	144.6171007	85.8435	0.302(0.047)	0.31	17.5	5.3 (0.8)
H₂S J_{K_aK_c} = 1₁₀–1₀₁	168.762.7624	100.1762	1.691(0.157)	0.68	31.7	54 (5.0)^g
H₂³⁴S J_{K_aK_c} = 1₁₀–1₀₁	167.9105160	99.6703	0.187(0.037)	0.73	31.6	5.9 (1.2)^g
C₂H N = 2–1	174.6915477	103.6954^f	6.45 (0.04)	0.32	52.1	340 (2)

Notes.

^(a)

Rest frequencies are taken from the Cologne Database for Molecular Spectroscopy (Müller et al. 2001);

^(b)

adopting z = 0.68466, heliocentric frame (Wiklind & Combes 1995);

^(c)

% of total continuum level;

^(d)

coefficients for calculating column density from integrated opacity: Ncol = α × ^∫τdv, assuming purely radiative excitation with CMB photons, i.e., rotation temperature of 4.6 K;

^(e)

total column densities, calculated as explained in (d);

^(f)

weighted mean frequency of the hyperfine components;

^(g)

total column density assuming an ortho/para ratio of 3.

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