We present sub-arcsecond resolution HCN ( 4–3 ) and CO ( 3–2 ) observations made with the Submillimeter Array ( SMA The Submillimeter Array is a joint project between the Smithsonian Astrophysical Observatory and the Academia Sinica Institute of Astronomy and Astrophysics and is funded by the Smithsonian Institution and the Academia Sinica . ) , toward an extremely young intermediate-mass protostellar core , MMS 6-main , located in the Orion Molecular Cloud 3 region ( OMC-3 ) .
We have successfully imaged a compact molecular outflow lobe ( \approx 1500 AU ) associated with MMS6-main , which is also the smallest molecular outflow ever found in the intermediate-mass protostellar cores .
The dynamical time scale of this outflow is estimated to be { \leq } 100 yr .
The line width dramatically increases downstream at the end of the molecular outflow ( { \Delta } v { \sim } 25 km s ^ { -1 } ) , and clearly shows the bow-shock type velocity structure .
The estimated outflow mass ( \approx 10 ^ { -4 } M _ { \odot } ) and outflow size are approximately 2–4 orders and 1–3 orders of magnitude smaller , while the outflow force ( \approx 10 ^ { -4 } M _ { \odot } km s ^ { -1 } yr ^ { -1 } ) is similar , as compared to the other molecular outflows studied in OMC-2/3 .
These results show that MMS 6-main is a protostellar core at the earliest evolutionary stage , most likely shortly after the 2nd core formation .