Poster Presentation
ALMA survey of the Orion dense cores: Unveiling the Jet Launching Scenario from Low-mass Protostars
Presenter: Somnath Dutta (ASIAA)
Recently a sample of 72 extremely young dense cores in the Orion complex has been studied with the ALMA Band 6. We obtained the 1.3 mm continuum images at an angular resolution of ~ 0.35" (140 au), as well as CO, C18O and SiO line emission images at a resolution of ~ 0.40" (160 au). Our preliminary analyses of the CO images reveal 40% of the observed dense cores have bipolar outflows with outflow opening angle acting as a function of the age of the host protostars. Rest sources include starless cores, compact emission with no outflow, and unresolved compact emission. Around 58% of the outflow sources are showing collimated jets in their SiO and CO emission. Using the continuum and C18O line emission, the outflow sources have been found to consist of a compact envelope ranging from 150 to 1200 au in the mass spectrum 0.035-0.60 M_sun. The preliminary results suggest that the observed jets are mostly launched at early-to-mid Class 0 evolutionary stages depending upon the compactness of the low-mass protostellar envelope.
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