LERMA UMR8112

Laboratoire d’Études du Rayonnement et de la Matière en Astrophysique et Atmosphères

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Spectroscopie VUV à haute résolution de molécules interstellaires

Spectroscopie VUV à haute résolution de molécules interstellaires

Membres M. Eidelsberg (chercheur bénévole), M. Glass-Maujean (Prof. émérite), A.-M. Vasserot (MCF), S. Leach (chercheur bénévole), J.-L. Lemaire (chercheur bénévole), W-Ü L. Tchang-Brillet (Prof.), C. (...)

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Séminaires à venir

Vendredi 23 octobre 2020, 14h00
téléconférence Zoom,
The role of molecular filaments in the origin of the IMF
Philippe ANDRÉ
CEA, Laboratoire d’Astrophysique AIM Paris-Saclay
résumé :
The origin of the stellar initial mass function (IMF) is one of the most debated
issues in astrophysics. I will discuss new insights into this problem based on a systematic census of prestellar cores and molecular filaments in nearby clouds taken as part of the Herschel Gould Belt survey, as well as higher-resolution observations with APEX/ArTéMiS and ALMA. Our results point to the key role of the quasi-universal filamentary structure pervading molecular clouds. They suggest that the dense cores making up the peak of the prestellar core mass function (CMF) - and indirectly the peak of the IMF - result from gravitational fragmentation of molecular filaments near the critical mass per unit length. The Salpeter power-law tail of the CMF/IMF may be at least partly inherited from the filament line mass function (FLMF), which is observed to follow a Salpeter-like power law in the regime of thermally supercritical filaments.

 
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