An ALMA Early Science survey of molecular absorption lines toward PKS 1830-211 Analysis of the absorption profiles
Artikel i vetenskaplig tidskrift, 2014

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.

Författare

Sebastien Muller

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

F. Combes

CNRS Centre National de la Recherche Scientifique

M. Guelin

Institut de RadioAstronomie Millimetrique (IRAM)

LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres

M. Gerin

LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres

Susanne Aalto

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

A. Beelen

Universite Paris-Sud XI

John H Black

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

S.J. Curran

The University of Sydney

ARC Centre of Excellence for All-sky Astrophysics (CAASTRO

J. Darling

University of Colorado at Boulder

D.-V. Trung

Vietnamese Academy of Science and Technology Institute of Physics and Electronics

S. G. Burillo

Observatorio Astronomico Nacional

C. Henkel

Max Planck-institutet

King Abdulaziz University

Cathy Horellou

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

S. Martin

Institut de RadioAstronomie Millimetrique (IRAM)

Ivan Marti-Vidal

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

K. M. Menten

Max Planck-institutet

M. T. Murphy

Swinburne University of Technology

J. Ott

National Radio Astronomy Observatory Socorro

Tommy Wiklind

Atacama Large Millimeter-submillimeter Array

M. A. Zwaan

European Southern Observatory (ESO)

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 566 A112

Ämneskategorier

Astronomi, astrofysik och kosmologi

Infrastruktur

Onsala rymdobservatorium

DOI

10.1051/0004-6361/201423646