ATLASGAL-selected massive clumps in the inner Galaxy, II: Characterisation of different evolutionary stages and their SiO emission
| dc.contributor.author | CSENGERI, T., | |
| hal.structure.identifier | Max-Planck-Institut für Radioastronomie [MPIFR] | |
| dc.contributor.author | LEURINI, S., | |
| dc.contributor.author | WYROWSKI, F., | |
| hal.structure.identifier | Mars Desert Research Station [MDRS] | |
| dc.contributor.author | URQUHART, J. S., | |
| dc.contributor.author | MENTEN, K. M., | |
| hal.structure.identifier | foreign laboratories [FL] | |
| dc.contributor.author | WALMSLEY, M., | |
| hal.structure.identifier | FORMATION STELLAIRE 2016 | |
| dc.contributor.author | BONTEMPS, Sylvain | |
| hal.structure.identifier | Max-Planck-Institut für Radioastronomie [MPIFR] | |
| dc.contributor.author | WIENEN, M., | |
| dc.contributor.author | BEUTHER, H., | |
| hal.structure.identifier | Procédés, Matériaux et Energie Solaire [PROMES] | |
| dc.contributor.author | MOTTE, F., | |
| dc.contributor.author | NGUYEN-LUONG, Q., | |
| hal.structure.identifier | Physikalisches Institut [Köln] | |
| dc.contributor.author | SCHILKE, P., | |
| dc.contributor.author | SCHULLER, F., | |
| hal.structure.identifier | Laboratoire d'Astrophysique de Marseille [LAM] | |
| dc.contributor.author | ZAVAGNO, Annie | |
| dc.contributor.author | SANNA, C., | |
| dc.date.issued | 2016 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | The 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.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.title.en | ATLASGAL-selected massive clumps in the inner Galaxy, II: Characterisation of different evolutionary stages and their SiO emission | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361/201425404 | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA] | |
| dc.identifier.arxiv | 1511.05138 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | id.A149 | |
| bordeaux.volume | 586 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01238870 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01238870v1 | |
| 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=2016&rft.volume=586&rft.spage=id.A149&rft.epage=id.A149&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=CSENGERI,%20T.,&LEURINI,%20S.,&WYROWSKI,%20F.,&URQUHART,%20J.%20S.,&MENTEN,%20K.%20M.,&rft.genre=article |
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