Volume 563, March 2014
|Number of page(s)||6|
|Published online||25 February 2014|
First results from the CALYPSO IRAM-PdBI survey
I. Kinematics of the inner envelope of NGC 1333-IRAS2A⋆,⋆⋆,⋆⋆⋆
1 UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d’Astrophysique de Grenoble, UMR 5274, 38041 Grenoble, France
2 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
3 Harvard-Smithsonian Center for Astrophysics, 60 Garden street, Cambridge MA 02138, USA
4 IRAM, 300 rue de la piscine, 38406 Saint Martin d’Hères, France
5 Laboratoire AIM-Paris-Saclay, CEA/DSM/Irfu – CNRS – Université Paris Diderot, CE-Saclay, 91191 Gif-sur-Yvette, France
6 LERMA, Observatoire de Paris, CNRS, ENS, UPMC, UCP, 61 Av de l’Observatoire, 75014 Paris, France
7 INAF – Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
8 Université de Bordeaux, LAB, UMR 5804, 33270 Floirac, France
9 CNRS, LAB, UMR 5804, 33270 Floirac, France
Received: 11 November 2013
Accepted: 22 January 2014
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⊙. If a disk is present, it is smaller than the disk of L1527-IRS, perhaps suggesting that NGC 1333-IRAS2A is younger.
Key words: ISM: individual objects: NGC 1333-IRAS2A / ISM: kinematics and dynamics / ISM: molecules / stars: formation
Based on observations carried out with the IRAM Plateau de Bure interferometer. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain).
Reduced PdBI data are available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (22.214.171.124) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/563/L1
© ESO, 2014
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