Bottlenecks to interstellar sulfur chemistry: Sulfur-bearing hydrides in UV-illuminated gas and grains

25 pags., 24 figs., 9 tabs.

Detalles Bibliográficos
Autores: Goicoechea, Javier R., Aguado, Alfredo, Cuadrado, S., Roncero, Octavio, Pety, J., Bron, E., Fuente, A., Riquelme, D., Chapillon, E., Herrera, C., Duran, C.A.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2021
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/256851
Acceso en línea:http://hdl.handle.net/10261/256851
Access Level:acceso abierto
Palabra clave:Astrochemistry
Line: identification
ISM: clouds
(ISM:) photon-dominated region (PDR)
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repository_id_str
dc.title.none.fl_str_mv Bottlenecks to interstellar sulfur chemistry: Sulfur-bearing hydrides in UV-illuminated gas and grains
title Bottlenecks to interstellar sulfur chemistry: Sulfur-bearing hydrides in UV-illuminated gas and grains
spellingShingle Bottlenecks to interstellar sulfur chemistry: Sulfur-bearing hydrides in UV-illuminated gas and grains
Goicoechea, Javier R.
Astrochemistry
Line: identification
ISM: clouds
(ISM:) photon-dominated region (PDR)
ISM: clouds
title_short Bottlenecks to interstellar sulfur chemistry: Sulfur-bearing hydrides in UV-illuminated gas and grains
title_full Bottlenecks to interstellar sulfur chemistry: Sulfur-bearing hydrides in UV-illuminated gas and grains
title_fullStr Bottlenecks to interstellar sulfur chemistry: Sulfur-bearing hydrides in UV-illuminated gas and grains
title_full_unstemmed Bottlenecks to interstellar sulfur chemistry: Sulfur-bearing hydrides in UV-illuminated gas and grains
title_sort Bottlenecks to interstellar sulfur chemistry: Sulfur-bearing hydrides in UV-illuminated gas and grains
dc.creator.none.fl_str_mv Goicoechea, Javier R.
Aguado, Alfredo
Cuadrado, S.
Roncero, Octavio
Pety, J.
Bron, E.
Fuente, A.
Riquelme, D.
Chapillon, E.
Herrera, C.
Duran, C.A.
author Goicoechea, Javier R.
author_facet Goicoechea, Javier R.
Aguado, Alfredo
Cuadrado, S.
Roncero, Octavio
Pety, J.
Bron, E.
Fuente, A.
Riquelme, D.
Chapillon, E.
Herrera, C.
Duran, C.A.
author_role author
author2 Aguado, Alfredo
Cuadrado, S.
Roncero, Octavio
Pety, J.
Bron, E.
Fuente, A.
Riquelme, D.
Chapillon, E.
Herrera, C.
Duran, C.A.
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia, Innovación y Universidades (España)
Ministerio de Economía y Competitividad (España)
Centro de Supercomputación de Galicia
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Astrochemistry
Line: identification
ISM: clouds
(ISM:) photon-dominated region (PDR)
ISM: clouds
topic Astrochemistry
Line: identification
ISM: clouds
(ISM:) photon-dominated region (PDR)
ISM: clouds
description 25 pags., 24 figs., 9 tabs.
publishDate 2021
dc.date.none.fl_str_mv 2021
2021
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/256851
url http://hdl.handle.net/10261/256851
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
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info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2017-85111-P
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2017-83473-C2-1-P
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-106110GB-I00
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-106235GB-I00
http://dx.doi.org/10.1051/0004-6361/202039756
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dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Springer Nature
publisher.none.fl_str_mv Springer Nature
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
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spelling Bottlenecks to interstellar sulfur chemistry: Sulfur-bearing hydrides in UV-illuminated gas and grainsGoicoechea, Javier R.Aguado, AlfredoCuadrado, S.Roncero, OctavioPety, J.Bron, E.Fuente, A.Riquelme, D.Chapillon, E.Herrera, C.Duran, C.A.AstrochemistryLine: identificationISM: clouds(ISM:) photon-dominated region (PDR)ISM: clouds25 pags., 24 figs., 9 tabs.Hydride molecules lie at the base of interstellar chemistry, but the synthesis of sulfuretted hydrides is poorly understood and their abundances often crudely constrained. Motivated by new observations of the Orion Bar photodissociation region (PDR) - 100 resolution ALMA images of SH+; IRAM 30 m detections of bright H32 2 S, H34 2 S, and H33 2 S lines; H3S+ (upper limits); and SOFIA/GREAT observations of SH (upper limits) we perform a systematic study of the chemistry of sulfur-bearing hydrides. We self-consistently determine their column densities using coupled excitation, radiative transfer as well as chemical formation and destruction models. We revise some of the key gas-phase reactions that lead to their chemical synthesis. This includes ab initio quantum calculations of the vibrational-state-dependent reactions SH+ + H2(v) H2S+ + H and S + H2 (v) SH + H.We find that reactions of UV-pumped H2(v 2) molecules with S+ ions explain the presence of SH+ in a high thermal-pressure gas component, Pth=k 108 cm-3 K, close to the H2 dissociation front (at AV < 2 mag). These PDR layers are characterized by no or very little depletion of elemental sulfur from the gas. However, subsequent hydrogen abstraction reactions of SH+, H2S+, and S atoms with vibrationally excited H2, fail to form enough H2S+, H3S+, and SH to ultimately explain the observed H2S column density (∼2.5 1014 cm-2, with an ortho-to-para ratio of 2.9 .3; consistent with the high-temperature statistical value). To overcome these bottlenecks, we build PDR models that include a simple network of grain surface reactions leading to the formation of solid H2S (s-H2S). The higher adsorption binding energies of S and SH suggested by recent studies imply that S atoms adsorb on grains (and form s-H2S) at warmer dust temperatures (Td < 50 K) and closer to the UV-illuminated edges of molecular clouds. We show that everywhere s-H2S mantles form(ed), gas-phase H2S emission lines will be detectable. Photodesorption and, to a lesser extent, chemical desorption, produce roughly the same H2S column density (a few 1014 cm-2) and abundance peak (a few 10-8) nearly independently of nH and G0. This agrees with the observed H2S column density in the Orion Bar as well as at the edges of dark clouds without invoking substantial depletion of elemental sulfur abundances.We thank the Spanish MICIU for funding support under grants AYA2016-75066-C2-2-P, AYA2017-85111-P, FIS2017-83473-C2 PID2019-106110GB-I00, and PID2019-106235GB-I00 and the French-Spanish collaborative project PICS (PIC2017FR). We finally acknowledge computing time at Finisterrae (CESGA) under RES grant ACCT-2019-3-0004.Springer NatureMinisterio de Ciencia, Innovación y Universidades (España)Ministerio de Economía y Competitividad (España)Centro de Supercomputación de GaliciaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2021202120212021info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/256851reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2017-85111-Pinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2017-83473-C2-1-Pinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-106110GB-I00info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-106235GB-I00http://dx.doi.org/10.1051/0004-6361/202039756Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2568512026-05-22T06:33:51Z
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