First results from the CALYPSO IRAM-PdBI survey I. Kinematics of the inner envelope of NGC 1333-IRAS2A

被引：28

作者：

Maret, S. ^{[1
]}

Belloche, A. ^{[2
]}

Maury, A. J. ^{[3
]}

Gueth, F. ^{[4
]}

Andre, Ph ^{[5
]}

Cabrit, S. ^{[1
,6
]}

Codella, C. ^{[7
]}

Bontemps, S. ^{[8
,9
]}

机构：

[1] UJF Grenoble 1, CNRS, INSU, Inst Planetol & Astrophys Grenoble,UMR 5274, F-38041 Grenoble, France

[2] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[3] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[4] Inst Radio Astron Millimetr, F-38406 St Martin Dheres, France

[5] Univ Paris Diderot, CE Saclay, CNRS, Lab AIM Paris Saclay,CEA,DSM,Irfu, F-91191 Gif Sur Yvette, France

[6] UPMC, UCP, CNRS, LERMA,Observa Paris,ENS, F-75014 Paris, France

[7] Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy

[8] Univ Bordeaux, LAB, UMR 5804, F-33270 Floirac, France

[9] CNRS, LAB, UMR 5804, F-33270 Floirac, France

来源：

ASTRONOMY & ASTROPHYSICS | 2014年 / 563卷

关键词：

ISM: individual objects: NGC 1333-IRAS2A; ISM: kinematics and dynamics; ISM: molecules; stars: formation; LOW-MASS PROTOSTARS; STAR-FORMING REGIONS; PROTOSTELLAR ENVELOPES; KEPLERIAN DISK; WATER; ABUNDANCE; ROTATION; MASERS; CLOUDS; CORES;

D O I：

10.1051/0004-6361/201323028

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：6

共 23 条

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