Properties of the dense core population in Orion B as seen by the Herschel Gould Belt survey
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
| dc.contributor.author | KÖNYVES, V. | |
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
| dc.contributor.author | ANDRE, Ph. | |
| hal.structure.identifier | Institut d'astrophysique spatiale [IAS] | |
| dc.contributor.author | ARZOUMANIAN, D. | |
| hal.structure.identifier | Centre d'études et de recherches éco-géographiques [CEREG] | |
| dc.contributor.author | SCHNEIDER, N. | |
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
| dc.contributor.author | MEN'SHCHIKOV, A. | |
| hal.structure.identifier | FORMATION STELLAIRE 2019 | |
| dc.contributor.author | BONTEMPS, Sylvain | |
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
| dc.contributor.author | LADJELATE, B. | |
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
| dc.contributor.author | DIDELON, P. | |
| hal.structure.identifier | Istituto di Fisica dello Spazio Interplanetario [IFSI] | |
| dc.contributor.author | PEZZUTO, S. | |
| dc.contributor.author | BENEDETTINI, M. | |
| hal.structure.identifier | Istituto Nazionale di Fisica Nucleare, Sezione di Milano [INFN] | |
| dc.contributor.author | BRACCO, A. | |
| hal.structure.identifier | Herzberg Institute of Astrophysics | |
| dc.contributor.author | DI FRANCESCO, J. | |
| dc.contributor.author | GOODWIN, S. | |
| hal.structure.identifier | INAF - Osservatorio Astronomico di Bologna [OABO] | |
| dc.contributor.author | RYGL, K. L. J. | |
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
| dc.contributor.author | SHIMAJIRI, Y. | |
| hal.structure.identifier | Antarctic Research a European Network for Astrophysics [ARENA] | |
| dc.contributor.author | SPINOGLIO, L. | |
| hal.structure.identifier | School of Physics and Astronomy [Cardiff] | |
| dc.contributor.author | WARD-THOMPSON, D. | |
| hal.structure.identifier | Engineering Department | |
| dc.contributor.author | WHITE, G. J. | |
| dc.date.issued | 2019 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | We present a detailed study of the Orion B clouds (d~400 pc), imaged with the PACS/SPIRE cameras at 70-500 $\mu$m by the Herschel Gould Belt survey (HGBS). We release new high-res. maps of column density and dust temperature. In the filamentary sub-regions NGC2023/2024, NGC2068/2071, and L1622, 1768 starless dense cores were identified, ~28-45% of which are self-gravitating prestellar cores. A total of 76 protostellar dense cores were also found. The typical lifetime of the prestellar cores was found to be $t_{\rm pre}=1.7_{-0.6}^{+0.8}$ Myr. The prestellar core mass function (CMF) peaks at ~0.5 $M_\odot$ and is consistent with a power law with log slope -1.27$\pm$0.24 at the high-mass end, compared to the Salpeter slope of -1.35. In this region, we confirm the existence of a transition in prestellar core formation efficiency (CFE) around a fiducial value A_V_bg~7 mag in background visual extinction, similar to the trend observed with Herschel in other clouds. This is not a sharp threshold, but a smooth transition between a regime with very low prestellar CFE at A_V_bg<5 and a regime with higher, roughly constant CFE at A_V_bg$\gtrsim$10. The total mass in the form of prestellar cores represents only ~20% of the dense molecular cloud gas at A_V_bg$\gtrsim$7 mag. About 60-80% of the prestellar cores are closely associated with filaments, and this fraction increases up to >90% when a more complete sample of filamentary structures is considered. Interestingly, the median separation between nearest core neighbors corresponds to the typical inner filament width of ~0.1 pc commonly observed in nearby molecular clouds. Analysis of the CMF observed as a function of background cloud column density shows that the most massive prestellar cores are spatially segregated in the highest column density areas, and suggests that both higher- and lower-mass prestellar cores may form in denser filaments. | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.subject.en | Astrophysics - Solar and Stellar Astrophysics | |
| dc.subject.en | Astrophysics - Astrophysics of Galaxies | |
| dc.title.en | Properties of the dense core population in Orion B as seen by the Herschel Gould Belt survey | |
| dc.type | Article de revue | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique galactique [astro-ph.GA] | |
| dc.identifier.arxiv | 1910.04053 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | accepted Astronomy & Astrophysics | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-02310427 | |
| hal.version | 1 | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-02310427v1 | |
| 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=2019&rft.spage=accepted%20Astronomy%20&%20Astrophysics&rft.epage=accepted%20Astronomy%20&%20Astrophysics&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=K%C3%96NYVES,%20V.&ANDRE,%20Ph.&ARZOUMANIAN,%20D.&SCHNEIDER,%20N.&MEN'SHCHIKOV,%20A.&rft.genre=article |
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