First detection of interstellar S2H
| hal.structure.identifier | Observatorio Astronomico Nacional, Madrid | |
| dc.contributor.author | FUENTE, Asuncion | |
| hal.structure.identifier | Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] [CSIC] | |
| dc.contributor.author | GOICOECHEA, Javier | |
| hal.structure.identifier | Institut de RadioAstronomie Millimétrique [IRAM] | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| dc.contributor.author | PETY, Jérôme | |
| dc.contributor.author | LE GAL, Romane | |
| dc.contributor.author | MARTÍN-DOMÉNECH, Rafael | |
| hal.structure.identifier | AMOR 2017 | |
| dc.contributor.author | GRATIER, P. | |
| hal.structure.identifier | Joint ALMA Observatory [JAO] | |
| dc.contributor.author | GUZMAN, Viviana | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| dc.contributor.author | ROUEFF, Evelyne | |
| hal.structure.identifier | Institut des Sciences Moléculaires [ISM] | |
| dc.contributor.author | LOISON, Jean Christophe | |
| dc.contributor.author | MUÑOZ-CARO, Guillermo M. | |
| hal.structure.identifier | AMOR 2017 | |
| dc.contributor.author | WAKELAM, Valentine | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| dc.contributor.author | GERIN, Maryvonne | |
| hal.structure.identifier | European Space Astronomy Centre [ESAC] | |
| dc.contributor.author | RIVIERE-MARICHALAR, Pablo | |
| hal.structure.identifier | AMOR 2017 | |
| dc.contributor.author | VIDAL, Thomas | |
| dc.date.issued | 2017 | |
| dc.identifier.issn | 2041-8205 | |
| dc.description.abstractEn | 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 ~5x10$^{-11}$, only a factor 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 ~1.2x10$^{-3}$ and <1x10$^{-5}$ molecules per incident photon for H2S and S2H, respectively. Our upper limit to the S2H photodesorption yield suggests that photo-desorption is not a competitive mechanism to release the S2H molecules to the gas phase. Other desorption mechanisms such as chemical desorption, cosmic-ray desorption and grain shattering can increase the gaseous S2H abundance to some extent. Alternatively, S2H can be formed via gas phase reactions involving gaseous H2S and the abundant ions S+ and SH+. The detection of S2H in this nebula could be therefore the result of the coexistence of an active grain surface chemistry and gaseous photo-chemistry. | |
| dc.language.iso | en | |
| dc.publisher | Bristol : IOP Publishing | |
| dc.subject.en | Astrochemistry | |
| dc.subject.en | methods: laboratory: solid state | |
| dc.subject.en | ISM: abundances | |
| dc.subject.en | ISM: molecules | |
| dc.subject.en | photondominated region (PDR) | |
| dc.subject.en | Horsehead | |
| dc.title.en | First detection of interstellar S2H | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.3847/2041-8213/aaa01b | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA] | |
| dc.identifier.arxiv | 1712.03036 | |
| bordeaux.journal | The Astrophysical journal letters | |
| bordeaux.page | L49 | |
| bordeaux.volume | 851 | |
| bordeaux.issue | 2 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01661652 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01661652v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The%20Astrophysical%20journal%20letters&rft.date=2017&rft.volume=851&rft.issue=2&rft.spage=L49&rft.epage=L49&rft.eissn=2041-8205&rft.issn=2041-8205&rft.au=FUENTE,%20Asuncion&GOICOECHEA,%20Javier&PETY,%20J%C3%A9r%C3%B4me&LE%20GAL,%20Romane&MART%C3%8DN-DOM%C3%89NECH,%20Rafael&rft.genre=article |
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