First results from the CALYPSO IRAM-PdBI survey. I. Kinematics of the inner envelope of NGC1333-IRAS2A

S. Maret A. Belloche 1 A. J. Maury Frédéric Gueth 2 Ph. André 3 S. Cabrit 4 C. Codella 5 S. Bontemps 6
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 : The structure and kinematics of Class 0 protostars on scales of a few hundred AU is poorly known. Recent observations have revealed the presence of Keplerian disks with a diameter of 150-180 AU in L1527-IRS and VLA1623A, but it is not clear if such disks are common in Class 0 protostars. Here we present high-angular-resolution observations of two methanol lines in NGC1333-IRAS2A. We argue that these lines probe the inner envelope, and we use them to study the kinematics of this region. Our observations suggest the presence of a marginal velocity gradient normal to the direction of the outflow. However, the position velocity diagrams along the gradient direction appear inconsistent with a Keplerian disk. Instead, we suggest that the emission originates from the infalling and perhaps slowly rotating envelope, around a central protostar of 0.1-0.2 M$_\odot$. If a disk is present, it is smaller than the disk of L1527-IRS, perhaps suggesting that NGC1333-IRAS2A is younger.
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Contributeur : Marie-Paule Pomies <>
Soumis le : lundi 24 février 2014 - 12:51:27
Dernière modification le : mardi 24 avril 2018 - 17:20:08

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S. Maret, A. Belloche, A. J. Maury, Frédéric Gueth, Ph. André, et al.. First results from the CALYPSO IRAM-PdBI survey. I. Kinematics of the inner envelope of NGC1333-IRAS2A. Astronomy and Astrophysics - A&A, EDP Sciences, 2014, 563, 〈10.1051/0004-6361/201323028〉. 〈hal-00951186〉



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