Ionization fraction and the enhanced sulfur chemistry in Barnard 1

30 págs.; 14 figs.; 5 tabs.; 2 apps.

Detalles Bibliográficos
Autores: Fuente, A., Cernicharo, José, Roueff, E., Gerin, Maryvonne, Pety, J., Marcelino, Nuria, Bachiller, R., Lefloch, Bertrand, Roncero, Octavio, Aguado, Alfredo
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/144159
Acceso en línea:http://hdl.handle.net/10261/144159
Access Level:acceso abierto
Palabra clave:Astrochemistry
ISM: abundances
ISM: individual objects: Barnard 1
ISM: molecules
Stars: formation
id ES_aa5d2cbd447fc2452a048dc196833cc4
oai_identifier_str oai:digital.csic.es:10261/144159
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Ionization fraction and the enhanced sulfur chemistry in Barnard 1
title Ionization fraction and the enhanced sulfur chemistry in Barnard 1
spellingShingle Ionization fraction and the enhanced sulfur chemistry in Barnard 1
Fuente, A.
Astrochemistry
ISM: abundances
ISM: individual objects: Barnard 1
ISM: molecules
Stars: formation
title_short Ionization fraction and the enhanced sulfur chemistry in Barnard 1
title_full Ionization fraction and the enhanced sulfur chemistry in Barnard 1
title_fullStr Ionization fraction and the enhanced sulfur chemistry in Barnard 1
title_full_unstemmed Ionization fraction and the enhanced sulfur chemistry in Barnard 1
title_sort Ionization fraction and the enhanced sulfur chemistry in Barnard 1
dc.creator.none.fl_str_mv Fuente, A.
Cernicharo, José
Roueff, E.
Gerin, Maryvonne
Pety, J.
Marcelino, Nuria
Bachiller, R.
Lefloch, Bertrand
Roncero, Octavio
Aguado, Alfredo
author Fuente, A.
author_facet Fuente, A.
Cernicharo, José
Roueff, E.
Gerin, Maryvonne
Pety, J.
Marcelino, Nuria
Bachiller, R.
Lefloch, Bertrand
Roncero, Octavio
Aguado, Alfredo
author_role author
author2 Cernicharo, José
Roueff, E.
Gerin, Maryvonne
Pety, J.
Marcelino, Nuria
Bachiller, R.
Lefloch, Bertrand
Roncero, Octavio
Aguado, Alfredo
author2_role author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Institut national des sciences de l'Univers (France)
Ministerio de Economía y Competitividad (España)
Canadian Space Agency
National Research Council of Canada
Centre National de la Recherche Scientifique (France)
European Research Council
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Astrochemistry
ISM: abundances
ISM: individual objects: Barnard 1
ISM: molecules
Stars: formation
topic Astrochemistry
ISM: abundances
ISM: individual objects: Barnard 1
ISM: molecules
Stars: formation
description 30 págs.; 14 figs.; 5 tabs.; 2 apps.
publishDate 2016
dc.date.none.fl_str_mv 2016
2017
2017
2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/144159
url http://hdl.handle.net/10261/144159
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2014-52172-C2
http://dx.doi.org/10.1051/0004-6361/201628285
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
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
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869416157034840064
spelling Ionization fraction and the enhanced sulfur chemistry in Barnard 1Fuente, A.Cernicharo, JoséRoueff, E.Gerin, MaryvonnePety, J.Marcelino, NuriaBachiller, R.Lefloch, BertrandRoncero, OctavioAguado, AlfredoAstrochemistryISM: abundancesISM: individual objects: Barnard 1ISM: moleculesStars: formation30 págs.; 14 figs.; 5 tabs.; 2 apps.Context. Barnard B1b has been revealed as one of the most interesting globules from the chemical and dynamical point of view. It presents a rich molecular chemistry characterized by large abundances of deuterated and complex molecules. Furthermore, this globule hosts an extremely young Class 0 object and one candidate for the first hydrostatic core (FHSC) proving the youth of this star-forming region. Aims. Our aim is to determine the cosmic ray ionization rate, ζH, and the depletion factors in this extremely young star-forming region. These parameters determine the dynamical evolution of the core. Methods. We carried out a spectral survey toward Barnard 1b as part of the IRAM large program >IRAM Chemical survey of sun-like star-forming regions> (ASAI) using the IRAM 30-m telescope at Pico Veleta (Spain). This provided a very complete inventory of neutral and ionic C-, N-, and S-bearing species with, from our knowledge, the first secure detections of the deuterated ions DCS and DOCO. We use a state-of-the-art pseudo-time-dependent gas-phase chemical model that includes the ortho and para forms of H, H, D, H, HD, DH, D, and D to determine the local value of the cosmic ray ionization rate and the depletion factors. Results. Our model assumes n(H) = 10 cm and T = 12 K, as derived from our previous works. The observational data are well fitted with ζH between 3 × 10 s and 10 s and the elemental abundances O/H = 3 × 10, N/H = 6.4-8 × 10, C/H = 1.7 × 10, and S/H between 6.0 × 10 and 1.0 × 10. The large number of neutral/protonated species detected allows us to derive the elemental abundances and cosmic ray ionization rate simultaneously. Elemental depletions are estimated to be ~10 for C and O, ~1 for N, and ~25 for S. Conclusions. Barnard B1b presents similar depletions of C and O as those measured in prestellar cores. The depletion of sulfur is higher than that of C and O, but not as extreme as in cold cores. In fact, it is similar to the values found in some bipolar outflows, hot cores, and photon-dominated regions. Several scenarios are discussed to account for these peculiar abundances. We propose that it is the consequence of the initial conditions (important outflows and enhanced UV fields in the surroundings) and a rapid collapse (~0.1 Myr) that allows most S-and N-bearing species to remain in the gas phase to great optical depths. The interaction of the compact outflow associated with B1b-S with the surrounding material could enhance the abundances of S-bearing molecules, as well. © ESO 2016We thank the Spanish MINECO for funding support from grants CSD2009-00038, FIS2012-32096, FIS2014-52172-C2 AYA2012-32032 and ERC under ERC-2013-SyG, G. A. 610256 NANOCOSMOS. E.R. and M.G. thank the INSU/CNRS program PCMI for funding. This research used the facilities of the Canadian Astronomy Data Centre operated by the National Research Council of Canada with the support of the Canadian Space AgencyPeer ReviewedEDP SciencesInstitut national des sciences de l'Univers (France)Ministerio de Economía y Competitividad (España)Canadian Space AgencyNational Research Council of CanadaCentre National de la Recherche Scientifique (France)European Research CouncilConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2017201720162017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/144159reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/FIS2014-52172-C2http://dx.doi.org/10.1051/0004-6361/201628285Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1441592026-05-22T06:33:51Z
score 15,812429

Similares en LA Referencia