Detection of chloronium and measurement of the 35Cl/37Cl isotopic ratio at z=0.89 toward PKS1830-211

Abstract

We report the first extragalactic detection of chloronium (H2Cl+), in the z=0.89 absorber in front of the lensed blazar PKS1830-211. The ion is detected through its 1_11-0_00 line along two independent lines of sight toward the North-East and South-West images of the blazar. The relative abundance of H2Cl+ is significantly higher (by a factor ~7) in the NE line of sight, which has a lower H2/H fraction, indicating that H2Cl+ preferably traces the diffuse gas component. From the ratio of the H2^35Cl+ and H2^37Cl+ absorptions toward the SW image, we measure a 35Cl/37Cl isotopic ratio of 3.1 (-0.2; +0.3) at z=0.89, similar to that observed in the Galaxy and the solar system.

arXiv commentAccepted for publication in A&A Letter

References in corpus (19)

• The Evolution of Isotope Ratios in the Milky Way Galaxy
• UVMULTIFIT: A versatile tool for fitting astronomical radio interferometric data
• Interstellar OH+, H2O+ and H3O+ along the sight-line to G10.6-0.4
• Molecules at z=0.89: A 4-mm-rest-frame absorption line survey toward PKS 1830-211
• The chemistry of interstellar molecules containing the halogen elements
• Ubiquitous argonium (ArH${}^{+}$) in the diffuse interstellar medium -- a molecular tracer of almost purely atomic gas
• Comparative study of CH+ and SH+ absorption lines observed towards distant star-forming regions
• A precise and accurate determination of the cosmic microwave background temperature at z=0.89
• Herschel/HIFI discovery of interstellar chloronium (H${}_2$Cl${}^{+}$)
• Water absorption in Galactic translucent clouds: conditions and history of the gas derived from Herschel/HIFI PRISMAS observations
• Probing isotopic ratios at z = 0.89: molecular line absorption in front of the quasar PKS 1830-211
• An ALMA Early Science survey of molecular absorption lines toward PKS1830-211 -- Analysis of the absorption profiles
• Herschel observations of interstellar chloronium
• Drastic changes in the molecular absorption at redshift z=0.89 toward the quasar PKS 1830-211
• A Comprehensive Survey of Hydrogen Chloride in the Galaxy
• Exploring Io's atmospheric composition with APEX: first measurement of 34SO2 and tentative detection of KCl
• Hydrogen chloride in diffuse interstellar clouds along the line of sight to W31C (G10.6-0.4)
• The 35Cl/37Cl isotopic ratio in dense molecular clouds: HIFI observations of hydrogen chloride towards W3A
• Fundamental Vibrational Transitions of HCl Detected in CRL 2136

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• ALCHEMI: an ALMA Comprehensive High-resolution Extragalactic Molecular Inventory. Survey presentation and first results from the ACA array
• Detection of extragalactic argonium, ArH${}^{+}$, toward PKS~1830$-$211
• OH+ and H2O+ absorption toward PKS1830-211
• New molecular species at redshift z=0.89
• Detection of CH+, SH+, and their 13C- and 34S- isotopologues toward PKS1830-211
• Detection of extragalactic CF+ toward PKS1830-211 -- Chemical differentiation in the absorbing gas
• A study of submillimeter methanol absorption toward PKS1830-211: Excitation, invariance of the proton-electron mass ratio, and systematics
• Chlorine-bearing molecules in molecular absorbers at intermediate redshifts
• Isotopic ratios at z=0.68 from molecular absorption lines toward B 0218+357
• The inhomogeneous ISM toward PKS1830-211 SW - A detailed view on molecular gas at a look-back time of 7.5 Gyr
• Chlorine Abundances in Cool Stars
• Chlorine Isotope Ratios in M Giants
• The ortho-to-para ratio of H${}_2$Cl${}^{+}$: Quasi-classical trajectory calculations and new simulations in light of new observations
• The Galactic Chemical Evolution of Chlorine
• The high resolution infrared spectrum of HCl${}^{+}$
• Cl+ and HCl+ in Reaction with H2 and Isotopologues: A Glance into H Abstraction and Indirect Exchange at Astrophysical Conditions
• A sub-ppm upper limit on the cosmological variations of the fine structure constant alpha
• Rotational excitation cross sections for chloronium based on a new 5D interaction potential with molecular hydrogen