TY - JOUR
T1 - An Extremely Young Protostellar Core, MMS 1/OMC-3
T2 - Episodic Mass Ejection History Traced by the Micro SiO Jet
AU - Takahashi, Satoko
AU - Machida, Masahiro N.
AU - Omura, Mitsuki
AU - Johnstone, Doug
AU - Saigo, Kazuya
AU - Harada, Naoto
AU - Tomisaka, Kohji
AU - Ho, Paul T.P.
AU - Zapata, Luis A.
AU - Mairs, Steve
AU - Herczeg, Gregory J.
AU - Taniguchi, Kotomi
AU - Liu, Yuhua
AU - Sato, Asako
N1 - Publisher Copyright:
© 2024. The Author(s). Published by the American Astronomical Society.
PY - 2024/3/1
Y1 - 2024/3/1
N2 - We present ∼0.″2 (∼80 au) resolution observations of the CO(2-1) and SiO(5-4) lines made with the Atacama large millimeter/submillimeter array toward an extremely young intermediate-mass protostellar source (t dyn < 1000 yr), MMS 1 located in the Orion Molecular Cloud-3 region. We have successfully imaged a very compact CO molecular outflow associated with MMS 1, having deprojected lobe sizes of ∼1800 au (redshifted lobe) and ∼2800 au (blueshifted lobe). We have also detected an extremely compact (≲1000 au) and collimated SiO protostellar jet within the CO outflow. The maximum deprojected jet speed is measured to be as high as 93 km s−1. The SiO jet wiggles and displays a chain of knots. Our detection of the molecular outflow and jet is the first direct evidence that MMS 1 already hosts a protostar. The position-velocity diagram obtained from the SiO emission shows two distinct structures: (i) bow shocks associated with the tips of the outflow, and (ii) a collimated jet, showing the jet velocities linearly increasing with the distance from the driving source. Comparisons between the observations and numerical simulations quantitatively share similarities such as multiple-mass ejection events within the jet and Hubble-like flow associated with each mass ejection event. Finally, while there is a weak flux decline seen in the 850 μm light curve obtained with the James Clerk Maxwell Telescope/SCUBA 2 toward MMS 1, no dramatic flux change events are detected. This suggests that there has not been a clear burst event within the last 8 yr.
AB - We present ∼0.″2 (∼80 au) resolution observations of the CO(2-1) and SiO(5-4) lines made with the Atacama large millimeter/submillimeter array toward an extremely young intermediate-mass protostellar source (t dyn < 1000 yr), MMS 1 located in the Orion Molecular Cloud-3 region. We have successfully imaged a very compact CO molecular outflow associated with MMS 1, having deprojected lobe sizes of ∼1800 au (redshifted lobe) and ∼2800 au (blueshifted lobe). We have also detected an extremely compact (≲1000 au) and collimated SiO protostellar jet within the CO outflow. The maximum deprojected jet speed is measured to be as high as 93 km s−1. The SiO jet wiggles and displays a chain of knots. Our detection of the molecular outflow and jet is the first direct evidence that MMS 1 already hosts a protostar. The position-velocity diagram obtained from the SiO emission shows two distinct structures: (i) bow shocks associated with the tips of the outflow, and (ii) a collimated jet, showing the jet velocities linearly increasing with the distance from the driving source. Comparisons between the observations and numerical simulations quantitatively share similarities such as multiple-mass ejection events within the jet and Hubble-like flow associated with each mass ejection event. Finally, while there is a weak flux decline seen in the 850 μm light curve obtained with the James Clerk Maxwell Telescope/SCUBA 2 toward MMS 1, no dramatic flux change events are detected. This suggests that there has not been a clear burst event within the last 8 yr.
UR - http://www.scopus.com/inward/record.url?scp=85187983316&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85187983316&partnerID=8YFLogxK
U2 - 10.3847/1538-4357/ad2268
DO - 10.3847/1538-4357/ad2268
M3 - Article
AN - SCOPUS:85187983316
SN - 0004-637X
VL - 964
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 48
ER -