期刊
ASTRONOMY & ASTROPHYSICS
卷 563, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201323028
关键词
ISM: individual objects: NGC 1333-IRAS2A; ISM: kinematics and dynamics; ISM: molecules; stars: formation
资金
- European Community [229517, 291294]
- French Agence Nationale de la Recherche (ANR) [ANR-12-JS05-0005]
- Agence Nationale de la Recherche (ANR) [ANR-12-JS05-0005] Funding Source: Agence Nationale de la Recherche (ANR)
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-circle dot. If a disk is present, it is smaller than the disk of L1527-IRS, perhaps suggesting that NGC 1333-IRAS2A is younger.
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