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Detection of CH+, S...
Detection of CH+, SH+, and their C-13- and S-34-isotopologues toward PKS 1830-211
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Muller, Holger (author)
- Universität zu Köln,University of Cologne
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- Black, John H, 1949 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Gerin, M. (author)
- Ecole Normale Superieure (ENS)
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- Combes, F. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- Curran, S. (author)
- Victoria University of Wellington
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- Falgarone, E. (author)
- Ecole Normale Superieure (ENS)
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- Guelin, M. (author)
- Institut de Radioastronomie Millimétrique (IRAM),Ecole Normale Superieure (ENS)
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- Henkel, C. (author)
- King Abdulaziz University,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Martin, S. (author)
- European Southern Observatory Santiago,Atacama Large Millimeter-submillimeter Array (ALMA)
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- Menten, K. M. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Roueff, E. (author)
- Ecole Normale Superieure (ENS)
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- Aalto, Susanne, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Beelen, A. (author)
- Université Paris-Sud XI,University of Paris-Sud XI
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- Wiklind, Tommy, 1957 (author)
- Catholic University of America
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- Zwaan, M. A. (author)
- European Southern Observatory (ESO)
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(creator_code:org_t)
- 2017-10-20
- 2017
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 606
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Abstract
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- The z = 0.89 molecular absorber toward PKS 1830-211 provides us with the opportunity to probe the chemical and physical properties of the interstellar medium in the disk of a galaxy at a look-back time of half the present age of the Universe. Recent ALMA observations of hydrides have unveiled the multi-phase composition of this source's interstellar medium along two absorbing sightlines. Here, we report ALMA observations of CH+ and SH+, and of their C-13- and S-34-isotopologues, as potential tracers of energetic processes in the interstellar medium. CH+ and (CH+)-C-13 are detected toward both images of PKS 1830-211, CH+ showing the deepest and broadest absorption among all species observed so far. The [CH+]/[(CH+)-C-13] abundance ratio is similar to 100 in the south-west line of sight. This value is larger than any previous [(CX)-C-12]/[(CX)-C-13] ratios determined from other species toward this source and suggests either that the latter might be affected by fractionation or that CH+ might be tracing a different gas component. Toward the north-east image, we find an even larger value of [CH+]/[(CH+)-C-13], 146 +/- 43, although with a large uncertainty. This sightline intercepts the absorber at a larger galactocentric radius than the southwestern one, where material might be less processed in stellar nucleosynthesis. In contrast to CH+ and its C-13 isotopologue, SH+ and (SH+)-S-34 are only detected on the south-west sightline. These are the first detections of extragalactic SH+ and interstellar (SH+)-S-34. The spectroscopic parameters of SH+ are reevaluated and improved rest frequencies of (SH+)-S-34 are obtained. The [CH+]/[SH+] column density ratios show a large difference between the two lines of sight: similar to 25 and > 600 toward the SW and NE image, respectively. We are not able to shed light on the formation process of CH+ and SH+ with these data, but the differences between the two sightlines toward PKS 1830-211 suggest that their absorptions arise from gas with a molecular fraction of greater than or similar to 10%, with SH+ tracing significantly higher molecular fractions than CH+.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- radio lines: galaxies
- galaxies: ISM
- quasars: absorption lines
- ISM: molecules
- quasars: individual: PKS 1830-211
- galaxies: abundances
Publication and Content Type
- art (subject category)
- ref (subject category)
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Muller, Sebastie ...
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Muller, Holger
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Black, John H, 1 ...
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Gerin, M.
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Combes, F.
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Curran, S.
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show more...
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Falgarone, E.
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Guelin, M.
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Henkel, C.
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Martin, S.
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Menten, K. M.
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Roueff, E.
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Aalto, Susanne, ...
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Beelen, A.
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Wiklind, Tommy, ...
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Zwaan, M. A.
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Chalmers University of Technology