Show pageOld revisionsBacklinksBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ===== On Extragalactic Sulfanylium, SH+ ===== S. Muller, H. S. P. Müller, J. H. Black, M. Gérin, F. Combes, S. Curran, E. Falgarone, M. Guélin, C. Henkel, S. Martín, K. M. Menten, E. Roueff, S. Aalto, A. Beelen, T. Wiklind, and M. A. Zwaan,\\ reported on the\\ **[[https://doi.org/10.1051/0004-6361/201731405|Detection of CH<sup>+</sup>, SH<sup>+</sup>, and Their <sup>13</sup>C- and <sup>34</sup>S-isotopologues toward PKS 1830–211]]**\\ //Astron. Astrophys.// **606**, (2017) Art. No. A109.\\ \\ The //N// = 1 – 0, //J// = 2 – 1 fine structure transitions of SH<sup>+</sup> and <sup>34</sup>SH<sup>+</sup> were observed with ALMA redshifted from about 526.0 and 525.1 GHz to about 279.9 and 278.4 GHz. The molecular cations were only detected toward the SW image representing denser material with a fairly high molecular fraction overall. They were not seen toward the NE image representing less dense material with a lower molecular fraction overall. Formation of SH<sup>+</sup> thus appears to require higher densities than that best suited for OH<sup>+</sup> or H<sub>2</sub>O<sup>+</sup>.\\ \\ The <sup>32</sup>S/<sup>34</sup>S isotopic ratio is 16.2 ± 1.3, lower than the terrestrial ratio of 22, thus suggesting greater importance of supernovae in the elemental synthesis about 7.5 billion years ago compared to today. On the other hand, the <sup>32</sup>S/<sup>34</sup>S isotopic ratios are still lower, about 10.5, for CS and H<sub>2</sub>S in that galaxy, suggesting an even greater importance of higher-mass supernovae in the probably still denser ISM where these two molecules reside.\\ \\ The isotopolog <sup>34</sup>SH<sup>+</sup> has not yet been detected in a Galactic source. ---- Contributor(s): H. S. P. Müller; 11, 2017 ---- molecules/extragalactic/sh-plus_extragalactic.txt Last modified: 2019/10/22 13:36by mueller