The chemistry of H2NC in the interstellar medium and the role of the C + NH3 reaction

10 pags., 7 figs., 5 tabs.

Detalhes bibliográficos
Autores: Agúndez, Marcelino, Roncero, Octavio, Marcelino, Nuria, Cabezas, Carlos, Tercero, Belén, Cernicharo, José
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/332861
Acesso em linha:http://hdl.handle.net/10261/332861
http://arxiv.org/abs/2303.12011v1
Access Level:acceso abierto
Palavra-chave:Astrochemistry
ISM: molecules
Line: Identification
Molecular processes
Radio lines: ISM
Astro-ph.GA
id ES_dc2a6a0ea4ead8fb7694773b355c2d81
oai_identifier_str oai:digital.csic.es:10261/332861
network_acronym_str ES
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repository_id_str
spelling The chemistry of H2NC in the interstellar medium and the role of the C + NH3 reactionAgúndez, MarcelinoRoncero, OctavioMarcelino, NuriaCabezas, CarlosTercero, BelénCernicharo, JoséAstrochemistryISM: moleculesLine: IdentificationMolecular processesRadio lines: ISMAstro-ph.GA10 pags., 7 figs., 5 tabs.We carried out an observational search for the recently discovered molecule H2NC, and its more stable isomer H2CN, toward eight cold dense clouds (L1544, L134N, TMC-2, Lupus-1A, L1489, TMC-1 NH3, L1498, and L1641N) and two diffuse clouds (B0415+379 and B0355+508) in an attempt to constrain its abundance in different types of interstellar regions and shed light on its formation mechanism. We detected H2NC in most of the cold dense clouds targeted, 7 out of 8, while H2CN was only detected in 5 out of 8 clouds. The column densities derived for both H2NC and H2CN are in the range 1e11-1e12 cm-2 and the abundance ratio H2NC/H2CN varies between 0.51 and >2.7. The metastable isomer H2NC is therefore widespread in cold dense clouds where it is present with an abundance similar to that of H2CN. We did not detect either H2NC or H2CN in any of the two diffuse clouds targeted, which does not allow to shed light on how the chemistry of H2NC and H2CN varies between dense and diffuse clouds. We found that the column density of H2NC is correlated with that of NH3, which strongly suggests that these two molecules are chemically linked, most likely ammonia being a precursor of H2NC through the C + NH3 reaction. We performed electronic structure and statistical calculations which show that both H2CN and H2NC can be formed in the C + NH3 reaction through two different channels involving two different transition states which lie very close in energy. The predicted product branching ratio H2NC/H2CN is very method dependent but values between 0.5 and 0.8 are the most likely ones. Therefore, both the astronomical observations and the theoretical calculations support that the reaction C + NH3 is the main source of H2NC in interstellar clouds.We acknowledge funding support from Spanish Ministerio de Ciencia e Innovación through grants PID2019-106110GB-I00, PID2019-107115GB-C21, PID2019-106235GB-I00, and PID2021-122549NB-C2.Peer reviewedEDP SciencesMinisterio de Ciencia e Innovación (España)Agúndez, Marcelino [0000-0003-3248-3564]Roncero, Octavio [0000-0002-8871-4846]Marcelino, Nuria [0000-0001-7236-4047]Cabezas, Carlos [0000-0002-1254-7738]Tercero, Belén [0000-0002-4782-5259]Cernicharo, José [0000-0002-3518-2524]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202320232023info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/332861http://arxiv.org/abs/2303.12011v1reponame: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 2017-2020/PID2019-106110GB-I00info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-107115GB-C21info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-106235GB-I00info:eu-repo/grantAgreement/AEI//PID2021-122549NB-C2A&A 673, A24 (2023)https://doi.org/10.1051/0004-6361/202346279Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3328612026-05-22T06:33:51Z
dc.title.none.fl_str_mv The chemistry of H2NC in the interstellar medium and the role of the C + NH3 reaction
title The chemistry of H2NC in the interstellar medium and the role of the C + NH3 reaction
spellingShingle The chemistry of H2NC in the interstellar medium and the role of the C + NH3 reaction
Agúndez, Marcelino
Astrochemistry
ISM: molecules
Line: Identification
Molecular processes
Radio lines: ISM
Astro-ph.GA
title_short The chemistry of H2NC in the interstellar medium and the role of the C + NH3 reaction
title_full The chemistry of H2NC in the interstellar medium and the role of the C + NH3 reaction
title_fullStr The chemistry of H2NC in the interstellar medium and the role of the C + NH3 reaction
title_full_unstemmed The chemistry of H2NC in the interstellar medium and the role of the C + NH3 reaction
title_sort The chemistry of H2NC in the interstellar medium and the role of the C + NH3 reaction
dc.creator.none.fl_str_mv Agúndez, Marcelino
Roncero, Octavio
Marcelino, Nuria
Cabezas, Carlos
Tercero, Belén
Cernicharo, José
author Agúndez, Marcelino
author_facet Agúndez, Marcelino
Roncero, Octavio
Marcelino, Nuria
Cabezas, Carlos
Tercero, Belén
Cernicharo, José
author_role author
author2 Roncero, Octavio
Marcelino, Nuria
Cabezas, Carlos
Tercero, Belén
Cernicharo, José
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
Agúndez, Marcelino [0000-0003-3248-3564]
Roncero, Octavio [0000-0002-8871-4846]
Marcelino, Nuria [0000-0001-7236-4047]
Cabezas, Carlos [0000-0002-1254-7738]
Tercero, Belén [0000-0002-4782-5259]
Cernicharo, José [0000-0002-3518-2524]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Astrochemistry
ISM: molecules
Line: Identification
Molecular processes
Radio lines: ISM
Astro-ph.GA
topic Astrochemistry
ISM: molecules
Line: Identification
Molecular processes
Radio lines: ISM
Astro-ph.GA
description 10 pags., 7 figs., 5 tabs.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023
2023
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/10261/332861
http://arxiv.org/abs/2303.12011v1
url http://hdl.handle.net/10261/332861
http://arxiv.org/abs/2303.12011v1
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #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 2017-2020/PID2019-106110GB-I00
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-107115GB-C21
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2019-106235GB-I00
info:eu-repo/grantAgreement/AEI//PID2021-122549NB-C2
A&A 673, A24 (2023)
https://doi.org/10.1051/0004-6361/202346279
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
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