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An ALMA Early Science survey of molecular absorption lines toward PKS 1830-211 Analysis of the absorption profiles

Sebastien Muller (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; F. Combes ; M. Guelin ; M. Gerin ; Susanne Aalto (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; A. Beelen ; John H. Black (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; S. J. Curran ; J. Darling ; V. Trung Dinh ; S. Garcia-Burillo ; C. Henkel ; Cathy Horellou (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; S. Martin ; Ivan Marti-Vidal (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; K. M. Menten ; M. T. Murphy ; J. Ott ; T. Wiklind ; M. A. Zwaan
Astronomy and Astrophysics (0004-6361). Vol. 566 (2014),
[Artikel, refereegranskad vetenskaplig]

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 PKS 1830-211. 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 (greater than or similar to 100 km s(-1)) 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 H-2 are found to be comparable to those in the Galactic diffuse medium. Of all the lines detected so far toward PKS 1830-211, 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.

Denna post skapades 2014-08-13. Senast ändrad 2016-04-04.
CPL Pubid: 201376


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