Universität zu Köln

Muller, S., Mueller, H. S. P., Black, J. H., Beelen, A., Combes, F., Curran, S., Gerin, M., Guelin, M., Henkel, C., Martin, S., Aalto, S., Falgarone, E., Menten, K. M., Schilke, P., Wiklind, T. and Zwaan, M. A. (2016). OH+ and H2O+ absorption toward PKS1830-211. Astron. Astrophys., 595. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

We report the detection of OH+ and H2O+ in the z = 0.89 absorber toward the lensed quasar PKS 1830-211. The abundance ratio of OH+ and H2O+ is used to quantify the molecular hydrogen fraction (f(H2)) and the cosmic-ray ionization rate of atomic hydrogen (zeta(H)) along two lines of sight, located at similar to 2 kpc and similar to 4 kpc to either side of the absorber's center. The molecular fraction decreases outward, from similar to 0.04 to similar to 0.02, comparable to values measured in the Milky Way at similar galactocentric radii. For zeta(H), we find values of similar to 2 x 10(-14) s(-1) and similar to 3 x 10(-15) s(-1), respectively, which are slightly higher than in the Milky Way at comparable galactocentric radii, possibly due to a higher average star formation activity in the z = 0.89 absorber. The ALMA observations of OH+, H2O+, and other hydrides toward PKS 1830-211 reveal the multi-phase composition of the absorbing gas. Taking the column density ratios along the southwest and northeast lines of sight as a proxy of molecular fraction, we classify the species ArH+, OH+, H2Cl+, H2O+, CH, and HF as tracing gases increasingly more molecular. Incidentally, our data allow us to improve the accuracy of H2O+ rest frequencies and thus refine the spectroscopic parameters.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Muller, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, H. S. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Black, J. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Beelen, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Combes, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Curran, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gerin, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Guelin, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Henkel, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Martin, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aalto, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Falgarone, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Menten, K. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schilke, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wiklind, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zwaan, M. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-256691
DOI:	10.1051/0004-6361/201629073
Journal or Publication Title:	Astron. Astrophys.
Volume:	595
Date:	2016
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PKS 1830-211; MOLECULAR ABSORPTION; INFRARED-SPECTROSCOPY; ROTATIONAL SPECTRUM; INTERSTELLAR OH+; SPIRAL GALAXY; REDSHIFT; Z=0.89; H3O+; TRANSITION Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25669