| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| hal.structure.identifier | Université Grenoble Alpes [2016-2019] [UGA [2016-2019]] | |
| hal.structure.identifier | Institut de RadioAstronomie Millimétrique [IRAM] | |
| dc.contributor.author | ORKISZ, Jan | |
| hal.structure.identifier | Institut de RadioAstronomie Millimétrique [IRAM] | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| dc.contributor.author | PETY, Jérôme | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| dc.contributor.author | GERIN, Maryvonne | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| dc.contributor.author | BRON, Emeric | |
| hal.structure.identifier | Harvard-Smithsonian Center for Astrophysics [CfA] | |
| dc.contributor.author | GUZMÁN, Viviana | |
| hal.structure.identifier | Institut de RadioAstronomie Millimétrique [IRAM] | |
| dc.contributor.author | BARDEAU, Sébastien | |
| hal.structure.identifier | Consejo Superior de Investigaciones Cientificas [España] = Spanish National Research Council [Spain] [CSIC] | |
| dc.contributor.author | GOICOECHEA, Javier | |
| hal.structure.identifier | AMOR 2017 | |
| dc.contributor.author | GRATIER, P. | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| dc.contributor.author | LE PETIT, Franck | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| dc.contributor.author | LEVRIER, François | |
| hal.structure.identifier | National Radio Astronomy Observatory [NRAO] | |
| dc.contributor.author | LISZT, Harvey | |
| hal.structure.identifier | Harvard-Smithsonian Center for Astrophysics [CfA] | |
| dc.contributor.author | ÖBERG, Karin | |
| hal.structure.identifier | School of Physics and Astronomy [Cardiff] | |
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
| dc.contributor.author | PERETTO, Nicolas | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| dc.contributor.author | ROUEFF, Evelyne | |
| hal.structure.identifier | Instituto de RadioAstronomía Milimétrica [IRAM] | |
| dc.contributor.author | SIEVERS, Albrecht | |
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
| hal.structure.identifier | University of Exeter | |
| hal.structure.identifier | Maison de la Simulation [MDLS] | |
| dc.contributor.author | TREMBLIN, Pascal | |
| dc.date.issued | 2017-01 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | The nature of turbulence in molecular clouds is one of the key parameters that control star formation efficiency: compressive motions, as opposed to solenoidal motions, can trigger the collapse of cores, or mark the expansion of Hii regions. We try to observationally derive the fractions of momentum density ($\rho v$) contained in the solenoidal and compressive modes of turbulence in the Orion B molecular cloud and relate these fractions to the star formation efficiency in the cloud. The implementation of a statistical method developed by Brunt & Federrath (2014), applied to a $^{13}$CO(J=1-0) datacube obtained with the IRAM-30m telescope, allows us to retrieve 3-dimensional quantities from the projected quantities provided by the observations, yielding an estimate of the compressive versus solenoidal ratio in various regions of the cloud. Despite the Orion B molecular cloud being highly supersonic (mean Mach number $\sim$ 6), the fractions of motion in each mode diverge significantly from equipartition. The cloud's motions are on average mostly solenoidal (excess > 8 % with respect to equipartition), which is consistent with its low star formation rate. On the other hand, the motions around the main star-forming regions (NGC 2023 and NGC 2024) prove to be strongly compressive. We have successfully applied to observational data a method that was so far only tested on simulations, and have shown that there can be a strong intra-cloud variability of the compressive and solenoidal fractions, these fractions being in turn related to the star formation efficiency. This opens a new possibility for star-formation diagnostics in galactic molecular clouds. | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.subject.en | Astrophysics - Astrophysics of Galaxies | |
| dc.title.en | Turbulence and star formation efficiency in molecular clouds: solenoidal versus compressive motions in Orion B | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361/201629220 | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO] | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | 1701.00962 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | id.A99 | |
| bordeaux.volume | 599 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01434996 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01434996v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2017-01&rft.volume=599&rft.spage=id.A99&rft.epage=id.A99&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=ORKISZ,%20Jan&PETY,%20J%C3%A9r%C3%B4me&GERIN,%20Maryvonne&BRON,%20Emeric&GUZM%C3%81N,%20Viviana&rft.genre=article | |
