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Globules and Pillars in Cygnus X I. Herschel Far-infrared imaging of the Cyg OB2 environment

hal.structure.identifierDAM Île-de-France [DAM/DIF]
dc.contributor.authorSCHNEIDER, N.,
hal.structure.identifierFORMATION STELLAIRE 2016
dc.contributor.authorBONTEMPS, Sylvain
hal.structure.identifierProcédés, Matériaux et Energie Solaire [PROMES]
dc.contributor.authorMOTTE, F.,
dc.contributor.authorBLAZERE, A.,
dc.contributor.authorANDRE, Ph.,
dc.contributor.authorANDERSON, L. D.,
hal.structure.identifierInstitut d'astrophysique spatiale [IAS]
dc.contributor.authorARZOUMANIAN, D.,
dc.contributor.authorCOMERON, F.,
dc.contributor.authorDIDELON, P.,
dc.contributor.authorDI FRANCESCO, J.,
dc.contributor.authorDUARTE-CABRAL, A.,
dc.contributor.authorGUARCELLO, M. G.,
dc.contributor.authorHENNEMANN, M.
dc.contributor.authorHILL, T.,
dc.contributor.authorKONYVES, V.,
dc.contributor.authorMARSTON, A.,
dc.contributor.authorMINIER, V.,
dc.contributor.authorRYGL, K. L. J.,
hal.structure.identifierKOSMA,
dc.contributor.authorROELLIG, M.,
hal.structure.identifierFaculty of Arts and Science
dc.contributor.authorROY, A.,
dc.contributor.authorSPINOGLIO, L.,
hal.structure.identifierUniversity of Exeter
hal.structure.identifierMaison de la Simulation [MDLS]
dc.contributor.authorTREMBLIN, Pascal
dc.contributor.authorWHITE, G. J.,
dc.contributor.authorWRIGHT, N. J.,
dc.date.issued2016-04
dc.identifier.issn0004-6361
dc.description.abstractEnThe radiative feedback of massive stars on molecular clouds creates pillars, globules and other features at the interface between the HII region and molecular cloud. We present here Herschel observations between 70 and 500 micron of the immediate environment of the Cygnus OB2 association, performed within the HOBYS program. All structures were detected based on their appearance at 70 micron, and have been classified as pillars, globules, evaporating gasous globules (EGGs), proplyd-like objects, and condensations. From the 70 and 160 micron flux maps, we derive the local FUV field on the PDR surfaces. In parallel, we use a census of the O-stars to estimate the overall FUV-field, that is 10^3-10^4 G_0 close to the central OB cluster (within 10 pc) and decreases down to a few tens G_0, in a distance of 50 pc. From a SED fit to the four longest Herschel wavelengths, we determine column density and temperature maps and derive masses, volume densities and surface densities for these structures. We find that the morphological classification corresponds to distinct physical properties. Pillars and globules have the longest estimated photoevaporation lifetimes, a few 10^6 yr, while all other features should survive less than that. These lifetimes are consistent with that found in simulations of turbulent, UV-illuminated clouds. We propose a tentative evolutionary scheme in which pillars can evolve into globules, which in turn then evolve into EGGs, condensations and proplyd-like objects.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.eninterstellar medium
dc.subject.enclouds – individual objects
dc.subject.enCygnus X
dc.title.enGlobules and Pillars in Cygnus X I. Herschel Far-infrared imaging of the Cyg OB2 environment
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201628328
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA]
dc.identifier.arxiv1604.03967
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.page21
bordeaux.peerReviewedoui
hal.identifierhal-01302825
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01302825v1
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