Growing evidence for a core formation threshold traced in Herschel Gould Belt survey clouds

V. Könyves Ph. André 1 N. Schneider 2 P. Palmeirim D. Arzoumanian A. Men'Shchikov 1
2 FORMATION STELLAIRE 2013
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
Abstract : It has already been suggested that a threshold in column density - or in visual extinction - may need to be exceeded to form dense cores and then protostars. Based on Herschel Gould Belt survey results in the Aquila and Orion B molecular cloud complexes we observe clear connection between the locations of the detected prestellar cores and their background column density values. This finding appears to support a core formation scenario where such threshold corresponds to the extinction above which interstellar filaments become gravitationally unstable and fragment into cores. In these two actively star-forming regions we find the vast majority of the gravitationally bound prestellar cores above a high column density of about (6-7) × 1021 cm-2 (AV ˜ 6-7). This limit similarly appears in the column density probability distribution function (PDF) of the regions as well. The spatial distribution of the protostars and young stellar objects (YSOs) also shows a tight connection with the densest sites of both clouds, as more than 70 % of them appear above the mentioned AV thresholds. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
Type de document :
Article dans une revue
Astronomical Notes / Astronomische Nachrichten, Wiley-VCH Verlag, 2013, 334, pp.908. <10.1002/ASNA.201211956>
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Soumis le : lundi 24 février 2014 - 12:22:12
Dernière modification le : mardi 11 octobre 2016 - 14:58:56

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V. Könyves, Ph. André, N. Schneider, P. Palmeirim, D. Arzoumanian, et al.. Growing evidence for a core formation threshold traced in Herschel Gould Belt survey clouds. Astronomical Notes / Astronomische Nachrichten, Wiley-VCH Verlag, 2013, 334, pp.908. <10.1002/ASNA.201211956>. <hal-00951168>

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