TY - JOUR
T1 - The First Detection of a Protostellar CO Outflow in the Small Magellanic Cloud with ALMA
AU - Tokuda, Kazuki
AU - Zahorecz, Sarolta
AU - Kunitoshi, Yuri
AU - Higashino, Kosuke
AU - Tanaka, Kei E.I.
AU - Konishi, Ayu
AU - Suzuki, Taisei
AU - Kitano, Naoya
AU - Harada, Naoto
AU - Shimonishi, Takashi
AU - Neelamkodan, Naslim
AU - Fukui, Yasuo
AU - Kawamura, Akiko
AU - Onishi, Toshikazu
AU - Machida, Masahiro N.
N1 - Funding Information:
We would like to thank the anonymous referee for useful comments that improved the manuscript. This paper makes use of the following ALMA data: ADS/JAO. ALMA#2019.1.00534.S. ALMA is a partnership of the ESO (representing its member states), the NSF (USA), and NINS (Japan), together with the NRC (Canada), MOST, ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by the ESO, AUI/NRAO, and NAOJ. This work was supported by a NAOJ ALMA Scientific Research grant No. 2022-22B, Grants-in-Aid for Scientific Research (KAKENHI) of Japan Society for the Promotion of Science (JSPS; grant Nos. JP18H05440, JP19K14760, JP21H00049, JP21H00058, JP21H01145, and JP21K13962). N.N. acknowledges a United Arab Emirates University grant No. UPAR G00003479.
Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
PY - 2022/9/1
Y1 - 2022/9/1
N2 - Protostellar outflows are one of the most outstanding features of star formation. Observational studies over the last several decades have successfully demonstrated that outflows are ubiquitously associated with low- and high-mass protostars in solar-metallicity Galactic conditions. However, the environmental dependence of protostellar outflow properties is still poorly understood, particularly in the low-metallicity regime. Here we report the first detection of a molecular outflow in the Small Magellanic Cloud with 0.2 Z ⊙, using Atacama Large Millimeter/submillimeter Array observations at a spatial resolution of 0.1 pc toward the massive protostar Y246. The bipolar outflow is nicely illustrated by high-velocity wings of CO(3-2) emission at ≳15 km s−1. The evaluated properties of the outflow (momentum, mechanical force, etc.) are consistent with those of the Galactic counterparts. Our results suggest that the molecular outflows, i.e., the guidepost of the disk accretion at the small scale, might be universally associated with protostars across the metallicity range of ∼0.2-1 Z ⊙.
AB - Protostellar outflows are one of the most outstanding features of star formation. Observational studies over the last several decades have successfully demonstrated that outflows are ubiquitously associated with low- and high-mass protostars in solar-metallicity Galactic conditions. However, the environmental dependence of protostellar outflow properties is still poorly understood, particularly in the low-metallicity regime. Here we report the first detection of a molecular outflow in the Small Magellanic Cloud with 0.2 Z ⊙, using Atacama Large Millimeter/submillimeter Array observations at a spatial resolution of 0.1 pc toward the massive protostar Y246. The bipolar outflow is nicely illustrated by high-velocity wings of CO(3-2) emission at ≳15 km s−1. The evaluated properties of the outflow (momentum, mechanical force, etc.) are consistent with those of the Galactic counterparts. Our results suggest that the molecular outflows, i.e., the guidepost of the disk accretion at the small scale, might be universally associated with protostars across the metallicity range of ∼0.2-1 Z ⊙.
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U2 - 10.3847/2041-8213/ac81c1
DO - 10.3847/2041-8213/ac81c1
M3 - Article
AN - SCOPUS:85137276807
SN - 2041-8205
VL - 936
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L6
ER -