An ALMA Early Science survey of molecular absorption lines toward PKS1830-211 -- Analysis of the absorption profiles

10 DaoTan; (10) Observatorio Astronomico Nacional; (11) Max-Planck-Institut fur Radioastonomie; 12); (12) Astron. Dept.; (13) Centre for Astrophysics; (14) National Radio Astronomy Observatory; (15) Joint ALMA Observatory; (16) European Southern Observatory; (2) Observatoire de Paris

An ALMA Early Science survey of molecular absorption lines toward PKS1830-211 -- Analysis of the absorption profiles

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arxiv 1404.7667 v1 pith:7IVG4LSM submitted 2014-04-30 astro-ph.GA

An ALMA Early Science survey of molecular absorption lines toward PKS1830-211 -- Analysis of the absorption profiles

S. Muller (1) , F. Combes (2) , M. Guelin (3 , 4) , M. Gerin (4) , S. Aalto (1) , A. Beelen (5) , J. H. Black (1)

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S. J. Curran (6 7) J. Darling (8) Dinh-V-Trung (9) S. Garcia-Burillo (10) C. Henkel (11 12) C. Horellou (1) S. Martin (3) I. Marti-Vidal (1) K. M. Menten (11) M. T. Murphy (13) J. Ott (14) T. Wiklind (15) M. A. Zwaan (16) ((1) Department of Earth Space Sciences Chalmers University of Technology Onsala Space Observatory Sweden (2) Observatoire de Paris LERMA CNRS France (3) Institut de Radioastronomie Millimetrique (4) LRA/LERMA CNRS UMR 8112 Observatoire de Paris \& Ecole Normale Superieure Paris (5) Institut d'Astrophysique Spatiale Universite Paris-Sud (6) Sydney Institute for Astronomy School of Physics The University of Sydney Australia (7) ARC Centre of Excellence for All-sky Astrophysics (CAASTRO) (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) Observatorio Astronomico Nacional Alfonso XII Madrid Spain (11) Max-Planck-Institut fur Radioastonomie Auf dem Hugel Germany (12) Astron. Dept. King Abdulaziz University Jeddah Saudi Arabia (13) Centre for Astrophysics Supercomputing Swinburne University of Technology Hawthorn (14) National Radio Astronomy Observatory NM (15) Joint ALMA Observatory Alonso de C\'ordova Santiago Chile (16) European Southern Observatory Karl-Schwarzschild-Str. Germany)

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keywords absorptiontowardlinesmolecularspeciesgalaxypks1830-211absorber

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We present the first results of an ALMA spectral survey of strong absorption lines for common interstellar species in the z=0.89 molecular absorber toward the lensed blazar PKS1830-211. The dataset brings essential information on the structure and composition of the absorbing gas in the foreground galaxy. In particular, we find absorption over large velocity intervals (gtrsim 100 km/s) toward both lensed images of the blazar. This suggests either that the galaxy inclination is intermediate and that we sample velocity gradients or streaming motions in the disk plane, that the molecular gas has a large vertical distribution or extraplanar components, or that the absorber is not a simple spiral galaxy but might be a merger system. The number of detected species is now reaching a total of 42 different species plus 14 different rare isotopologues toward the SW image, and 14 species toward the NE line-of-sight. The abundances of CH, H2O, HCO+, HCN, and NH3 relative to H2 are found to be comparable to those in the Galactic diffuse medium. Of all the lines detected so far toward PKS1830-211, the ground-state line of ortho-water has the deepest absorption. We argue that ground-state lines of water have the best potential for detecting diffuse molecular gas in absorption at high redshift.

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