Detection of chloronium and measurement of the 35Cl/37Cl isotopic ratio at z = 0.89 toward PKS 1830–211

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Table 1

Astronomical measurements of the ³⁵Cl/³⁷Cl ratio.

Source	³⁵Cl/³⁷Cl	Species	Ref.

Solar system	3.13	Cl	1

IRC+10216	2.3 ± 0.5	NaCl, AlCl	2
Ori A	~4–6	HCl	3
IRC+10216	3.1 ± 0.6	NaCl, KCl, AlCl	4
IRC+10216	2.30 ± 0.24	NaCl, AlCl	5
W3 A^†	2.1 ± 0.5	HCl	6
NGC 6334I, Sgr B2(S)^†	~2.7–3.3	H₂Cl⁺and HCl	7
10 Galactic sources	~1–5^‡	HCl	8
W31 C, Sgr A^†	~2–4	H₂Cl⁺	9
W31 C^†	2.1 ± 1.5	HCl⁺	10
W31 C^†	~2.9	HCl	11
CRL 2136	2.3 ± 0.4^⋄	HCl	12

PKS 1830−211(SW)^†		H₂Cl⁺	13
PKS 1830−211(NE)^†	>1.9^*	H₂Cl⁺	13

Notes.

^(†)

The line was detected in absorption against the background source.

^(‡)

Possible confusion between absorption and emission features.

^(⋄)

A CH feature might partially blend with the H³⁷Cl signal, possibly affecting the derived value of the ratio.

^(*)

At 99.7% confidence level.

Reference. (1) Lodders (2003); (2) Cernicharo & Guélin (1987); (3) Salez et al. (1996); (4) Cernicharo et al. (2000); (5) Kahane et al. (2000); (6) Cernicharo et al. (2010); (7) Lis et al. (2010); (8) Peng et al. (2010); (9) Neufeld et al. (2012); (10) de Luca et al. (2012); (11) Monje et al. (2013); (12) Goto et al. (2013); (13) this work.

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