TY - JOUR
T1 - Sub-arcsecond Kinematic Structure of the Outflow in the Vicinity of the Protostar in L483
AU - Oya, Yoko
AU - Sakai, Nami
AU - Watanabe, Yoshimasa
AU - López-Sepulcre, Ana
AU - Ceccarelli, Cecilia
AU - Lefloch, Bertrand
AU - Yamamoto, And Satoshi
N1 - Funding Information:
We use the ALMA data set ADS/JAO.ALMA#2013.1.01102. S. ALMA is a partnership of the ESO (representing its member states), the NSF (USA) and NINS (Japan), together with the NRC (Canada) and the NSC and ASIAA (Taiwan), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by the ESO, the AUI/NRAO and the NAOJ. We thank the ALMA staff for their support. We are also grateful for the financial support by KAKENHI (25400223, 25108005, 15J01610, and 18H05222). Y.O., N.S., Y.W., and S.Y. acknowledge financial support by JSPS and MAEE under the Japan–France integrated action program. C.C. and B.L. thank CNRS for the support under the France–Japan action program.
Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved..
PY - 2018/8/10
Y1 - 2018/8/10
N2 - The bipolar outflow associated with the Class 0 low-mass protostellar source (IRAS 18148-0440) in L483 has been studied in the CCH and CS line emission at 245 and 262 GHz, respectively. Sub-arcsecond resolution observations of these lines have been conducted with ALMA. Structures and kinematics of the outflow cavity wall are investigated in the CS line, and are analyzed by using a parabolic model of an outflow. We constrain the inclination angle of the outflow to be from 75to 90, i.e., the outflow is blowing almost perpendicular to the line of sight. Comparing the outflow parameters derived from the model analysis with those of other sources, we confirm that the opening angle of the outflow and the gas velocity on its cavity wall correlate with the dynamical timescale of the outflows. Moreover, a hint of a rotating motion of the outflow cavity wall is found. Although the rotation motion is marginal, the specific angular momentum of the gas on the outflow cavity wall is evaluated to be comparable to or twice that of the infalling-rotating envelope of L483.
AB - The bipolar outflow associated with the Class 0 low-mass protostellar source (IRAS 18148-0440) in L483 has been studied in the CCH and CS line emission at 245 and 262 GHz, respectively. Sub-arcsecond resolution observations of these lines have been conducted with ALMA. Structures and kinematics of the outflow cavity wall are investigated in the CS line, and are analyzed by using a parabolic model of an outflow. We constrain the inclination angle of the outflow to be from 75to 90, i.e., the outflow is blowing almost perpendicular to the line of sight. Comparing the outflow parameters derived from the model analysis with those of other sources, we confirm that the opening angle of the outflow and the gas velocity on its cavity wall correlate with the dynamical timescale of the outflows. Moreover, a hint of a rotating motion of the outflow cavity wall is found. Although the rotation motion is marginal, the specific angular momentum of the gas on the outflow cavity wall is evaluated to be comparable to or twice that of the infalling-rotating envelope of L483.
KW - ISM: individual objects (L483, IRAS 18148-0440)
KW - ISM: molecules
KW - stars: formation
KW - stars: premain sequence
KW - stars: winds, outflows
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U2 - 10.3847/1538-4357/aacf42
DO - 10.3847/1538-4357/aacf42
M3 - Article
AN - SCOPUS:85051543351
SN - 0004-637X
VL - 863
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 72
ER -