Confirming the Explosive Outflow in G5.89 with ALMA

Abstract

The explosive molecular outflow detected decades ago in the Orion BN/KL region of massive star formation was considered to be a bizarre event. This belief was strengthened by the non detection of similar cases over the years with the only exception of the marginal case of DR21. Here, we confim a similar explosive outflow associated with the UCH${}_{\mathrm{II}}$ region G5.89$-$0.39 that indicates that this phenomenon is not unique to Orion or DR21. Sensitive and high angular resolution ($\sim$ 0.1${}^{\prime \prime }$) ALMA CO(2$-$1) and SiO(5$-$4) observations show that the molecular outflow in the massive star forming region G5.89$-$0.39 is indeed an explosive outflow with an age of about 1000 yrs and a liberated kinetic energy of 10${}^{46-49}$ erg. Our new CO(2$-$1) ALMA observations revealed over 30 molecular filaments, with Hubble-like expansion motions, pointing to the center of UCH${}_{\mathrm{II}}$ region. In addition, the SiO(5$-$4) observations reveal warmer and strong shocks very close to the origin of the explosion, confirming the true nature of the flow. A simple estimation for the occurrence of these explosive events during the formation of the massive stars indicates an event rate of once every $\sim$100 yrs, which is close to the supernovae rate.

arXiv commentAccepted by ApJ Letters. The animation is located here: https://drive.google.com/file/d/1a1c9JMwm0Mf8CxlfuEzyh6XmCOsgOyMA/view?usp=sharing

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• Magnetic Fields in Massive Star-Forming Regions (MagMaR) I. Linear Polarized Imaging of the UCHII Region G5.89-0.39
• The SEDIGISM survey: a search for molecular outflows
• Supersonic Expansion of the Bipolar Hii Region Sh2-106: A 3,500 Year-Old Explosion?
• First survey of HCNH${}^{+}$ in high-mass star-forming cloud cores
• Possible Explosive Dispersal Outflow in IRAS 16076-5134 revealed with ALMA
• SiO Outflows in the Most Luminous and Massive Protostellar Sources of the Southern Sky
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• Digging into the Interior of Hot Cores with ALMA (DIHCA). VII. Disk candidates around high-mass stars and evidence of anisotropic infall
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• Spatial distribution of NH2D in massive star-forming regions
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• Dense Molecular Ring-like structure in gaseous CO depletion region G34.74-0.12
• Explosive ejections generated by gravitational interactions