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

10 DaoTan; (10) European Southern Observatory; ((1) Department of Earth; (2) Institut de Radioastronomie Millimetrique; 3); (3) LRA/LERMA; (4) Max-Planck-Institut fur Radioastonomie; 5); (5) Astron. Dept.; (6) Observatoire de Paris

arxiv: 1404.7668 · v1 · pith:66GLB42Wnew · submitted 2014-04-30 · 🌌 astro-ph.GA

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

S. Muller (1) , J. H. Black (1) , M. Guelin (2 , 3) , C. Henkel (4 , 5) , F. Combes (6) , M. Gerin (3)

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S. Aalto (1) A. Beelen (7) J. Darling (8) C. Horellou (1) S. Martin (2) K. M. Menten (4) Dinh-V-Trung (9) M. A. Zwaan (10) ((1) Department of Earth Space Sciences Chalmers University of Technology Onsala Space Observatory Sweden (2) Institut de Radioastronomie Millimetrique France (3) LRA/LERMA CNRS UMR 8112 Observatoire de Paris & Ecole Normale Superieure Paris (4) Max-Planck-Institut fur Radioastonomie Auf dem Hugel Germany (5) Astron. Dept. King Abdulaziz University Saudi Arabia (6) Observatoire de Paris LERMA CNRS (7) Institut d'Astrophysique Spatiale Bat. 121 Universite Paris-Sud (8) Center for Astrophysics Space Astronomy Department of Astrophysical Planetary Sciences University of Colorado USA (9) Institute of Physics Vietnam Academy of Science Technology 10 DaoTan ThuLe BaDinh Hanoi Vietnam (10) European Southern Observatory Karl-Schwarzschild-Str. Munchen Germany)

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keywords h2clratiotowardblazarchloroniumdetectionisotopicline

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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.

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

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