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Detection of a Noble Gas Molecular Ion, (ArH+)-Ar-36, in the Crab Nebula
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2013 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 342, no 6164, 1343-1345 p.Article in journal (Refereed) Published
Abstract [en]

Noble gas molecules have not hitherto been detected in space. From spectra obtained with the Herschel Space Observatory, we report the detection of emission in the 617.5- and 1234.6-gigahertz J = 1-0 and 2-1 rotational lines of (ArH+)-Ar-36 at several positions in the Crab Nebula, a supernova remnant known to contain both molecular hydrogen and regions of enhanced ionized argon emission. Argon-36 is believed to have originated from explosive nucleosynthesis in massive stars during core-collapse supernova events. Its detection in the Crab Nebula, the product of such a supernova event, confirms this expectation. The likely excitation mechanism for the observed (ArH+)-Ar-36 emission lines is electron collisions in partially ionized regions with electron densities of a few hundred per centimeter cubed.

Place, publisher, year, edition, pages
2013. Vol. 342, no 6164, 1343-1345 p.
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-98270DOI: 10.1126/science.1243582ISI: 000328196000042OAI: diva2:686032


Available from: 2014-01-10 Created: 2014-01-03 Last updated: 2014-01-10Bibliographically approved

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Olofsson, Göran
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