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ATLASGAL-selected massive clumps in the inner Galaxy, II: Characterisation of different evolutionary stages and their SiO emission

dc.contributor.authorCSENGERI, T.,
hal.structure.identifierMax-Planck-Institut für Radioastronomie [MPIFR]
dc.contributor.authorLEURINI, S.,
dc.contributor.authorWYROWSKI, F.,
hal.structure.identifierMars Desert Research Station [MDRS]
dc.contributor.authorURQUHART, J. S.,
dc.contributor.authorMENTEN, K. M.,
hal.structure.identifierforeign laboratories [FL]
dc.contributor.authorWALMSLEY, M.,
hal.structure.identifierFORMATION STELLAIRE 2016
dc.contributor.authorBONTEMPS, Sylvain
hal.structure.identifierMax-Planck-Institut für Radioastronomie [MPIFR]
dc.contributor.authorWIENEN, M.,
dc.contributor.authorBEUTHER, H.,
hal.structure.identifierProcédés, Matériaux et Energie Solaire [PROMES]
dc.contributor.authorMOTTE, F.,
dc.contributor.authorNGUYEN-LUONG, Q.,
hal.structure.identifierPhysikalisches Institut [Köln]
dc.contributor.authorSCHILKE, P.,
dc.contributor.authorSCHULLER, F.,
hal.structure.identifierLaboratoire d'Astrophysique de Marseille [LAM]
dc.contributor.authorZAVAGNO, Annie
dc.contributor.authorSANNA, C.,
dc.date.issued2016
dc.identifier.issn0004-6361
dc.description.abstractEnThe processes leading to the birth of high-mass stars are poorly understood. We characterise here a sample of 430 massive clumps from the ATLASGAL survey, which are representative of different evolutionary stages. To establish a census of molecular tracers of their evolution we performed an unbiased spectral line survey covering the 3-mm atmospheric window between 84-117 GHz with the IRAM 30m. A smaller sample of 128 clumps has been observed in the SiO (5-4) transition with the APEX telescope to complement the SiO (2-1) line and probe the excitation conditions of the emitting gas, which is the main focus of the current study. We report a high detection rate of >75% of the SiO (2-1) line and a >90% detection rate from the dedicated follow-ups in the (5-4) transition. The SiO (2-1) line with broad line profiles and high detection rates, is a powerful probe of star formation activity, while the ubiquitous detection of SiO in all evolutionary stages suggests a continuous star formation process in massive clumps. We find a large fraction of infrared-quiet clumps to exhibit SiO emission, the majority of them only showing a low-velocity component (FWHM~5-6 km/s) centred at the rest velocity of the clump. In the current picture, where this is attributed to low-velocity shocks from cloud-cloud collisions, this can be used to pinpoint the youngest, thus, likely prestellar massive structures. Based on the line ratio of the (5-4) to the (2-1) line, our study reveals a trend of changing excitation conditions that lead to brighter emission in the (5-4) line towards more evolved sources. Our analysis delivers a more robust estimate of SiO column density and abundance than previous studies and questions the decrease of jet activity in massive clumps as a function of age.
dc.language.isoen
dc.publisherEDP Sciences
dc.title.enATLASGAL-selected massive clumps in the inner Galaxy, II: Characterisation of different evolutionary stages and their SiO emission
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201425404
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA]
dc.identifier.arxiv1511.05138
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.A149
bordeaux.volume586
bordeaux.peerReviewedoui
hal.identifierhal-01238870
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01238870v1
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