A correlation between chemistry, polarization and dust properties in the Pipe Nebula starless core FeSt 1-457

Pre-stellar cores within molecular clouds provide the very initial conditions in which stars are formed. FeSt 1-457 is a prototypical starless core and the most chemically evolved among those isolated, embedded in the most pristine part of the Pipe nebula, the bowl. We use the IRAM 30 m telescope an...

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Autores: Juárez, Carmen, Girart, Josep M., Frau, Pau, Palau Puigvert, Aina, Estalella, Robert, Morata, Oscar, Alves, Felipe O., Beltrán Sorolla, Maria Teresa, Padovani, Marco
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/121419
Acceso en línea:https://hdl.handle.net/2445/121419
Access Level:acceso abierto
Palabra clave:Matèria interstel·lar
Transferència radiativa
Interstellar matter
Radiative transfer
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spelling A correlation between chemistry, polarization and dust properties in the Pipe Nebula starless core FeSt 1-457Juárez, CarmenGirart, Josep M.Frau, PauPalau Puigvert, AinaEstalella, RobertMorata, OscarAlves, Felipe O.Beltrán Sorolla, Maria TeresaPadovani, MarcoMatèria interstel·larTransferència radiativaInterstellar matterRadiative transferPre-stellar cores within molecular clouds provide the very initial conditions in which stars are formed. FeSt 1-457 is a prototypical starless core and the most chemically evolved among those isolated, embedded in the most pristine part of the Pipe nebula, the bowl. We use the IRAM 30 m telescope and the PdBI to study the chemical and physical properties of the starless core FeSt 1-457 (Core 109) in the Pipe nebula. We fit the hyperfine structure of the N2H+ (1−0) IRAM 30 m data. This allowed us to measure with high precision the velocity field, line widths and opacity and derive the excitation temperature and column density in the core. We used a modified Bonnor-Ebert sphere model adding a temperature gradient towards the center to fit the 1.2 mm continuum emission and visual extinction maps. Using this model, we have estimated the abundances of the N2H+ and the rest of molecular lines detected in the 30 GHz wide line survey performed at 3 mm with IRAM 30 m using ARTIST software. The core presents a rich chemistry with emission from early (C3H2, HCN, CS) and late-time molecules (e.g., N2H+), with a clear chemical spatial differentiation for nitrogen (centrally peaked), oxygen (peaking to the southwest) and sulfurated molecules (peaking to the east). For most of the molecules detected (HCN, HCO+, CH3OH, CS, SO, 13CO and C18O), abundances are best fit with three values, presenting a clear decrease of abundance of at least one or two orders of magnitude towards the center of the core. The Bonnor-Ebert analysis indicates the core is gravitationally unstable and the magnetic field is not strong enough to avoid the collapse. Depletion of molecules onto the dust grains occurs at the interior of the core, where dust grain growth and dust depolarization also occurs. This suggests that these properties may be related. On the other hand, some molecules exhibit asymmetries in their integrated emission maps, which appear to be correlated with a previously reported submillimetre polarization asymmetry. These asymmetries could be due to a stronger interstellar radiation field in the western side of the core.EDP Sciences2018201820172018info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion16 p.application/pdfapplication/pdfhttps://hdl.handle.net/2445/121419Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1051/0004-6361/201628608Astronomy & Astrophysics, 2017, vol. 597, num. A74https://doi.org/10.1051/0004-6361/201628608(c) The European Southern Observatory (ESO), 2017info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1214192026-05-29T05:05:01Z
dc.title.none.fl_str_mv A correlation between chemistry, polarization and dust properties in the Pipe Nebula starless core FeSt 1-457
title A correlation between chemistry, polarization and dust properties in the Pipe Nebula starless core FeSt 1-457
spellingShingle A correlation between chemistry, polarization and dust properties in the Pipe Nebula starless core FeSt 1-457
Juárez, Carmen
Matèria interstel·lar
Transferència radiativa
Interstellar matter
Radiative transfer
title_short A correlation between chemistry, polarization and dust properties in the Pipe Nebula starless core FeSt 1-457
title_full A correlation between chemistry, polarization and dust properties in the Pipe Nebula starless core FeSt 1-457
title_fullStr A correlation between chemistry, polarization and dust properties in the Pipe Nebula starless core FeSt 1-457
title_full_unstemmed A correlation between chemistry, polarization and dust properties in the Pipe Nebula starless core FeSt 1-457
title_sort A correlation between chemistry, polarization and dust properties in the Pipe Nebula starless core FeSt 1-457
dc.creator.none.fl_str_mv Juárez, Carmen
Girart, Josep M.
Frau, Pau
Palau Puigvert, Aina
Estalella, Robert
Morata, Oscar
Alves, Felipe O.
Beltrán Sorolla, Maria Teresa
Padovani, Marco
author Juárez, Carmen
author_facet Juárez, Carmen
Girart, Josep M.
Frau, Pau
Palau Puigvert, Aina
Estalella, Robert
Morata, Oscar
Alves, Felipe O.
Beltrán Sorolla, Maria Teresa
Padovani, Marco
author_role author
author2 Girart, Josep M.
Frau, Pau
Palau Puigvert, Aina
Estalella, Robert
Morata, Oscar
Alves, Felipe O.
Beltrán Sorolla, Maria Teresa
Padovani, Marco
author2_role author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Matèria interstel·lar
Transferència radiativa
Interstellar matter
Radiative transfer
topic Matèria interstel·lar
Transferència radiativa
Interstellar matter
Radiative transfer
description Pre-stellar cores within molecular clouds provide the very initial conditions in which stars are formed. FeSt 1-457 is a prototypical starless core and the most chemically evolved among those isolated, embedded in the most pristine part of the Pipe nebula, the bowl. We use the IRAM 30 m telescope and the PdBI to study the chemical and physical properties of the starless core FeSt 1-457 (Core 109) in the Pipe nebula. We fit the hyperfine structure of the N2H+ (1−0) IRAM 30 m data. This allowed us to measure with high precision the velocity field, line widths and opacity and derive the excitation temperature and column density in the core. We used a modified Bonnor-Ebert sphere model adding a temperature gradient towards the center to fit the 1.2 mm continuum emission and visual extinction maps. Using this model, we have estimated the abundances of the N2H+ and the rest of molecular lines detected in the 30 GHz wide line survey performed at 3 mm with IRAM 30 m using ARTIST software. The core presents a rich chemistry with emission from early (C3H2, HCN, CS) and late-time molecules (e.g., N2H+), with a clear chemical spatial differentiation for nitrogen (centrally peaked), oxygen (peaking to the southwest) and sulfurated molecules (peaking to the east). For most of the molecules detected (HCN, HCO+, CH3OH, CS, SO, 13CO and C18O), abundances are best fit with three values, presenting a clear decrease of abundance of at least one or two orders of magnitude towards the center of the core. The Bonnor-Ebert analysis indicates the core is gravitationally unstable and the magnetic field is not strong enough to avoid the collapse. Depletion of molecules onto the dust grains occurs at the interior of the core, where dust grain growth and dust depolarization also occurs. This suggests that these properties may be related. On the other hand, some molecules exhibit asymmetries in their integrated emission maps, which appear to be correlated with a previously reported submillimetre polarization asymmetry. These asymmetries could be due to a stronger interstellar radiation field in the western side of the core.
publishDate 2017
dc.date.none.fl_str_mv 2017
2018
2018
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/121419
url https://hdl.handle.net/2445/121419
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1051/0004-6361/201628608
Astronomy & Astrophysics, 2017, vol. 597, num. A74
https://doi.org/10.1051/0004-6361/201628608
dc.rights.none.fl_str_mv (c) The European Southern Observatory (ESO), 2017
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) The European Southern Observatory (ESO), 2017
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 16 p.
application/pdf
application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv Articles publicats en revistes (Física Quàntica i Astrofísica)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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