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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 nondetection of similar cases over the years with the only exception of the marginal case of DR21. Here, we confirm a similar explosive outflow associated with the UCHII region G5.89-0.39 that indicates that this phenomenon is not unique to Orion or DR21. Sensitive and high angular resolution (∼0"1) Atacama Large Millimeter/submillimeter Array (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 yr and a liberated kinetic energy of 1046-49 erg. Our new CO(2-1) ALMA observations revealed over 30 molecular filaments, with Hubble-like expansion motions, pointing to the center of UCHII 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 ∼100 yr, which is close to the supernovae rate.
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Submitted on : Monday, June 27, 2022 - 8:31:34 AM
Last modification on : Tuesday, August 2, 2022 - 3:10:43 AM

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Luis A. Zapata, Paul T. P. Ho, Manuel Fernández-López, Estrella Guzmán Ccolque, Luis F. Rodríguez, et al.. Confirming the Explosive Outflow in G5.89 with ALMA. The Astrophysical Journal Letters, 2020, 902, ⟨10.3847/2041-8213/abbd3f⟩. ⟨insu-03705175⟩

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