First Detection of Interstellar S2H

We present the first detection of gas-phase S2H in the Horsehead, a moderately UV-irradiated nebula. This confirms the presence of doubly sulfuretted species in the interstellar medium and opens a new challenge for sulfur chemistry. The observed S2H abundance is ∼5 × 10−11, only a factor of 4-6 lowe...

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Veröffentlicht in:	Astrophysical journal. Letters 2017-12, Vol.851 (2)
Hauptverfasser:	Fuente, Asunción, Goicoechea, Javier R., Pety, Jérôme, Le Gal, Romane, Martín-Doménech, Rafael, Gratier, Pierre, Guzmán, Viviana, Roueff, Evelyne, Loison, Jean Christophe, Muñoz Caro, Guillermo M., Wakelam, Valentine, Gerin, Maryvonne, Riviere-Marichalar, Pablo, Vidal, Thomas
Format:	Artikel
Sprache:	eng
Schlagworte:	Abundance astrochemistry Astrophysics Atmospheric chemistry Cosmic rays Desorption Galactic Astrophysics Hydrogen sulfide Interstellar chemistry Interstellar gas Interstellar matter Interstellar medium Irradiation ISM: abundances ISM: individual objects (Horsehead) ISM: molecules methods: laboratory: solid state Nebulae Organic chemistry Photochemistry photon-dominated region (PDR) Sciences of the Universe Sulfur Surface chemistry Vapor phases
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Zusammenfassung:	We present the first detection of gas-phase S2H in the Horsehead, a moderately UV-irradiated nebula. This confirms the presence of doubly sulfuretted species in the interstellar medium and opens a new challenge for sulfur chemistry. The observed S2H abundance is ∼5 × 10−11, only a factor of 4-6 lower than that of the widespread H2S molecule. H2S and S2H are efficiently formed on the UV-irradiated icy grain mantles. We performed ice irradiation experiments to determine the H2S and S2H photodesorption yields. The obtained values are ∼1.2 × 10−3 and
ISSN:	2041-8205 2041-8213
DOI:	10.3847/2041-8213/aaa01b