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Ionized carbon as a tracer of the assembly of interstellar clouds

dc.contributor.authorSCHNEIDER, Nicola
dc.contributor.authorBONNE, Lars
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
dc.contributor.authorBONTEMPS, Sylvain
dc.contributor.authorKABANOVIC, Slawa
dc.contributor.authorSIMON, Robert
dc.contributor.authorOSSENKOPF-OKADA, Volker
dc.contributor.authorBUCHBENDER, Christof
dc.contributor.authorSTUTZKI, Jürgen
dc.contributor.authorMERTENS, Marc
dc.contributor.authorRICKEN, Oliver
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
dc.contributor.authorCSENGERI, Timea
dc.contributor.authorTIELENS, Alexander G.G.M.
dc.date.issued2023-05
dc.description.abstractEnAbstract Molecular hydrogen clouds are a key component of the interstellar medium because they are the birthplaces for stars. They are embedded in atomic gas that pervades the interstellar space. However, the details of how molecular clouds assemble from and interact with the atomic gas are still largely unknown. As a result of new observations of the 158 μm line of ionized carbon [CII] in the Cygnus region within the FEEDBACK program on SOFIA (Stratospheric Observatory for Infrared Astronomy), we present compelling evidence that [CII] unveils dynamic interactions between cloud ensembles. This process is neither a head-on collision of fully molecular clouds nor a gentle merging of only atomic clouds. Moreover, we demonstrate that the dense molecular clouds associated with the DR21 and W75N star-forming regions and a cloud at higher velocity are embedded in atomic gas, and all components interact over a large range of velocities (roughly 20 km s −1 ). The atomic gas has a density of around 100 cm −3 and a temperature of roughly 100 K. We conclude that the [CII] 158 μm line is an excellent tracer to witness the processes involved in cloud interactions and anticipate further detections of this phenomenon in other regions.
dc.description.sponsorshipGENeration et Evolution des Structures du milieu InterStellaire - ANR-16-CE92-0035
dc.language.isoen
dc.publisherNature Publishing Group
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.title.enIonized carbon as a tracer of the assembly of interstellar clouds
dc.typeArticle de revue
dc.identifier.doi10.1038/s41550-023-01901-5
dc.subject.halPlanète et Univers [physics]
bordeaux.journalNature Astronomy
bordeaux.page546-556
bordeaux.volume7
bordeaux.issue5
bordeaux.peerReviewedoui
hal.identifierinsu-04155170
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//insu-04155170v1
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