Planck early results. XXI. Properties of the interstellar medium in the Galactic plane

18 páginas, 17 figuras.-- Planck Collaboration: et al.

Detalles Bibliográficos
Autores: Barreiro, R. Belén, Herranz, Diego, López-Caniego, M., Martínez-González, Enrique, Vielva, Patricio
Tipo de recurso: artículo
Fecha de publicación:2011
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/46444
Acceso en línea:http://hdl.handle.net/10261/46444
Access Level:acceso abierto
Palabra clave:ISM: general
Galaxy: general
Radio continuum: ISM
Submillimeter: ISM
Infrared: ISM
Radiation mechanisms: general
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spelling Planck early results. XXI. Properties of the interstellar medium in the Galactic planeBarreiro, R. BelénHerranz, DiegoLópez-Caniego, M.Martínez-González, EnriqueVielva, PatricioISM: generalGalaxy: generalRadio continuum: ISMSubmillimeter: ISMInfrared: ISMRadiation mechanisms: general18 páginas, 17 figuras.-- Planck Collaboration: et al.Planck has observed the entire sky from 30 GHz to 857GHz. The observed foreground emission contains contributions from different phases of the interstellar medium (ISM). We have separated the observed Galactic emission into the different gaseous components (atomic, molecular and ionised) in each of a number of Galactocentric rings. This technique provides the necessary information to study dust properties (emissivity, temperature, etc.), as well as other emission mechanisms as a function of Galactic radius. Templates are created for various Galactocentric radii using velocity information from atomic (neutral hydrogen) and molecular (12CO) observations. The ionised template is assumed to be traced by free-free emission as observed by WMAP, while 408 MHz emission is used to trace the synchrotron component. Gas emission not traced by the above templates, namely “dark gas”, as evidenced using Planck data, is included as an additional template, the first time such a component has been used in this way. These templates are then correlated with each of the Planck frequency bands, as well as with higher frequency data from IRAS and DIRBE along with radio data at 1.4 GHz. The emission per column density of the gas templates allows us to create distinct spectral energy distributions (SEDs) per Galactocentric ring and in each of the gaseous tracers from 1.4 GHz to 25 THz (12μm). The resulting SEDs allow us to explore the contribution of various emission mechanisms to the Planck signal. Apart from the thermal dust and free-free emission, we have probed the Galaxy for anomalous (e.g., spinning) dust as well as synchrotron emission. We find the dust opacity in the solar neighbourhood, τ/NH = 0.92 ± 0.05 × 10-25 cm2 at 250 μm, with no significant variation with Galactic radius, even though the dust temperature is seen to vary from over 25 K to under 14 K. Furthermore, we show that anomalous dust emission is present in the atomic, molecular and dark gas phases throughout the Galactic disk. Anomalous emission is not clearly detected in the ionised phase, as free-free emission is seen to dominate. The derived dust propeties associated with the dark gas phase are derived but do not allow us to reveal the nature of this phase. For all environments, the anomalous emission is consistent with rotation from polycyclic aromatic hydrocarbons (PAHs) and, according to our simple model, accounts for (25 ± 5)% (statistical) of the total emission at 30 GHz.Peer reviewedEDP Sciences201220122011info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/46444reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1051/0004-6361/201116455info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/464442026-05-22T06:33:51Z
dc.title.none.fl_str_mv Planck early results. XXI. Properties of the interstellar medium in the Galactic plane
title Planck early results. XXI. Properties of the interstellar medium in the Galactic plane
spellingShingle Planck early results. XXI. Properties of the interstellar medium in the Galactic plane
Barreiro, R. Belén
ISM: general
Galaxy: general
Radio continuum: ISM
Submillimeter: ISM
Infrared: ISM
Radiation mechanisms: general
title_short Planck early results. XXI. Properties of the interstellar medium in the Galactic plane
title_full Planck early results. XXI. Properties of the interstellar medium in the Galactic plane
title_fullStr Planck early results. XXI. Properties of the interstellar medium in the Galactic plane
title_full_unstemmed Planck early results. XXI. Properties of the interstellar medium in the Galactic plane
title_sort Planck early results. XXI. Properties of the interstellar medium in the Galactic plane
dc.creator.none.fl_str_mv Barreiro, R. Belén
Herranz, Diego
López-Caniego, M.
Martínez-González, Enrique
Vielva, Patricio
author Barreiro, R. Belén
author_facet Barreiro, R. Belén
Herranz, Diego
López-Caniego, M.
Martínez-González, Enrique
Vielva, Patricio
author_role author
author2 Herranz, Diego
López-Caniego, M.
Martínez-González, Enrique
Vielva, Patricio
author2_role author
author
author
author
dc.subject.none.fl_str_mv ISM: general
Galaxy: general
Radio continuum: ISM
Submillimeter: ISM
Infrared: ISM
Radiation mechanisms: general
topic ISM: general
Galaxy: general
Radio continuum: ISM
Submillimeter: ISM
Infrared: ISM
Radiation mechanisms: general
description 18 páginas, 17 figuras.-- Planck Collaboration: et al.
publishDate 2011
dc.date.none.fl_str_mv 2011
2012
2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/46444
url http://hdl.handle.net/10261/46444
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1051/0004-6361/201116455
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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score 15.811543

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