Mass growth in MYSO fed by companion

TL;DR

This study uses SMA observations to reveal a gas transfer flow from a gas bubble to a massive young stellar object, providing insights into mass growth mechanisms in MYSOs.

Contribution

It demonstrates a direct gas transfer flow between a gas bubble and a MYSO, highlighting a new mode of mass accumulation in massive star formation.

Findings

Gas flow is confined between the NE Bubble and SW MYSO.

Mass transfer rate onto the MYSO is approximately 4.2×10⁻⁴ solar masses per year.

The transfer flow potentially explains a new mass growth pathway for MYSOs.

Abstract

We present a Submillimeter Array (SMA) observation towards the young massive double-core system G350.69-0.49. This system consists of a northeast (NE) diffuse gas Bubble and a southwest (SW) massive young stellar object (MYSO), both clearly seen in the Spitzer images. The SMA observations reveal a gas flow between the NE Bubble and the SW MYSO in a broad velocity range from 5 to 30 km/s with respect to the system velocity. The gas flow is well confined within the interval between the two objects, and traces a significant mass transfer from the NE gas Bubble to the SW massive core. The transfer flow can supply the material accreted onto the SW MYSO at a rate of $4.2\times10^{-4} year^{-1}$. The whole system therefore suggests a mode for the mass growth in MYSO from a gas transfer flow launched from its companion gas clump, despite that the driving mechanism of the transfer flow is not yet fully determined from the current data.