13CO/C18O Gradients across the Disks of Nearby Spiral Galaxies

We use the IRAM Large Program EMPIRE and new high-resolution ALMA data to measure CO(1-0)/CO(1-0) intensity ratios across nine nearby spiral galaxies. These isotopologues of CO are typically optically thin across most of the area in galaxy disks, and this ratio allows us to gauge their relative abun...

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Autores: Jiménez-Donaire, M.J., Cormier, D., Bigiel, F., Leroy, A. K., Gallagher, M., Krumholz, M. R., Usero, Antonio, Hughes, A., Kramer, C., Meier, D., Murphy, Eric J., Pety, Jérôme, Schinnerer, Eva, Schruba, A., Schuster, K., Sliwa, K., Tomicic, N.
Tipo de documento: artigo
Estado:Versión aceptada para publicación
Data de publicação:2017
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/370016
Acesso em linha:http://hdl.handle.net/10261/370016
Access Level:Acceso aberto
Palavra-chave:Galaxies: ISM
ISM: molecules
Radio lines: galaxies
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spelling 13CO/C18O Gradients across the Disks of Nearby Spiral GalaxiesJiménez-Donaire, M.J.Cormier, D.Bigiel, F.Leroy, A. K.Gallagher, M.Krumholz, M. R.Usero, AntonioHughes, A.Kramer, C.Meier, D.Murphy, Eric J.Pety, JérômeSchinnerer, EvaSchruba, A.Schuster, K.Sliwa, K.Tomicic, N.Galaxies: ISMISM: moleculesRadio lines: galaxiesWe use the IRAM Large Program EMPIRE and new high-resolution ALMA data to measure CO(1-0)/CO(1-0) intensity ratios across nine nearby spiral galaxies. These isotopologues of CO are typically optically thin across most of the area in galaxy disks, and this ratio allows us to gauge their relative abundance due to chemistry or stellar nucleosynthesis effects. Resolved CO/CO gradients across normal galaxies have been rare due to the faintness of these lines. We find a mean CO/CO ratio of 6.0 ±0.9 for the central regions of our galaxies. This agrees well with results in the Milky Way, but differs from results for starburst galaxies (3.4 ± 0.9) and ultraluminous infrared galaxies (1.1 ± 0.4). In our sample, the CO/CO ratio consistently increases with increasing galactocentric radius and decreases with increasing star formation rate surface density. These trends could be explained if the isotopic abundances are altered by fractionation; the sense of the trends also agrees with those expected for carbon and oxygen isotopic abundance variations due to selective enrichment by massive stars. © 2017. The American Astronomical Society. All rights reservedF.B., M.J., and D.C. acknowledge support from DFG grant BI 1546/1-1. A.H. acknowledges support from the Centre National d’Etudes Spatiales (CNES). A.U. acknowledges support from Spanish MINECO grants FIS2012-32096 and ESP2015-68964. The work of A.K.L. is partially supported by the National Science Foundation under grants No. 1615105 and 1615109. M.R.K. acknowledges support from ARC DP160100695. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This paper makes use of the following ALMA data: ADS/JAO. ALMA #2011.0.00004.SV. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), NSC and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ.American Astronomical SocietyCentre National D'Etudes Spatiales (France)German Research FoundationMinisterio de Economía y Competitividad (España)National Science Foundation (US)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2024202420172024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/370016reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MINECO//FIS2012-32096info:eu-repo/grantAgreement/MINECO//ESP2015-68964-Phttp://dx.doi.org/10.3847/2041-8213/836/2/L29Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3700162026-05-22T06:33:51Z
dc.title.none.fl_str_mv 13CO/C18O Gradients across the Disks of Nearby Spiral Galaxies
title 13CO/C18O Gradients across the Disks of Nearby Spiral Galaxies
spellingShingle 13CO/C18O Gradients across the Disks of Nearby Spiral Galaxies
Jiménez-Donaire, M.J.
Galaxies: ISM
ISM: molecules
Radio lines: galaxies
title_short 13CO/C18O Gradients across the Disks of Nearby Spiral Galaxies
title_full 13CO/C18O Gradients across the Disks of Nearby Spiral Galaxies
title_fullStr 13CO/C18O Gradients across the Disks of Nearby Spiral Galaxies
title_full_unstemmed 13CO/C18O Gradients across the Disks of Nearby Spiral Galaxies
title_sort 13CO/C18O Gradients across the Disks of Nearby Spiral Galaxies
dc.creator.none.fl_str_mv Jiménez-Donaire, M.J.
Cormier, D.
Bigiel, F.
Leroy, A. K.
Gallagher, M.
Krumholz, M. R.
Usero, Antonio
Hughes, A.
Kramer, C.
Meier, D.
Murphy, Eric J.
Pety, Jérôme
Schinnerer, Eva
Schruba, A.
Schuster, K.
Sliwa, K.
Tomicic, N.
author Jiménez-Donaire, M.J.
author_facet Jiménez-Donaire, M.J.
Cormier, D.
Bigiel, F.
Leroy, A. K.
Gallagher, M.
Krumholz, M. R.
Usero, Antonio
Hughes, A.
Kramer, C.
Meier, D.
Murphy, Eric J.
Pety, Jérôme
Schinnerer, Eva
Schruba, A.
Schuster, K.
Sliwa, K.
Tomicic, N.
author_role author
author2 Cormier, D.
Bigiel, F.
Leroy, A. K.
Gallagher, M.
Krumholz, M. R.
Usero, Antonio
Hughes, A.
Kramer, C.
Meier, D.
Murphy, Eric J.
Pety, Jérôme
Schinnerer, Eva
Schruba, A.
Schuster, K.
Sliwa, K.
Tomicic, N.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Centre National D'Etudes Spatiales (France)
German Research Foundation
Ministerio de Economía y Competitividad (España)
National Science Foundation (US)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Galaxies: ISM
ISM: molecules
Radio lines: galaxies
topic Galaxies: ISM
ISM: molecules
Radio lines: galaxies
description We use the IRAM Large Program EMPIRE and new high-resolution ALMA data to measure CO(1-0)/CO(1-0) intensity ratios across nine nearby spiral galaxies. These isotopologues of CO are typically optically thin across most of the area in galaxy disks, and this ratio allows us to gauge their relative abundance due to chemistry or stellar nucleosynthesis effects. Resolved CO/CO gradients across normal galaxies have been rare due to the faintness of these lines. We find a mean CO/CO ratio of 6.0 ±0.9 for the central regions of our galaxies. This agrees well with results in the Milky Way, but differs from results for starburst galaxies (3.4 ± 0.9) and ultraluminous infrared galaxies (1.1 ± 0.4). In our sample, the CO/CO ratio consistently increases with increasing galactocentric radius and decreases with increasing star formation rate surface density. These trends could be explained if the isotopic abundances are altered by fractionation; the sense of the trends also agrees with those expected for carbon and oxygen isotopic abundance variations due to selective enrichment by massive stars. © 2017. The American Astronomical Society. All rights reserved
publishDate 2017
dc.date.none.fl_str_mv 2017
2024
2024
2024
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/10261/370016
url http://hdl.handle.net/10261/370016
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#
info:eu-repo/grantAgreement/MINECO//FIS2012-32096
info:eu-repo/grantAgreement/MINECO//ESP2015-68964-P
http://dx.doi.org/10.3847/2041-8213/836/2/L29
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Astronomical Society
publisher.none.fl_str_mv American Astronomical Society
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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score 15.198674

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