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25 April 2024 |
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Article overview
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Confirming the Explosive Outflow in G5.89 with ALMA | | Luis A. Zapata
; Paul T. P. Ho
; Manuel Fernández-López
; Estrella Guzmán Ccolque
; Luis F. Rodriguez
; José Reyes-Valdés
; John Bally
; Aina Palau
; Masao Saito
; Patricio Sanhueza
; P. R. Rivera-Ortiz
; A. Rodriguez-González
; | | Date: |
26 Oct 2020 | | 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$_{
m II}$ 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$’’$) 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$-$1) ALMA
observations revealed over 30 molecular filaments, with Hubble-like expansion
motions, pointing to the center of UCH$_{
m 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. | | Source: | arXiv, 2010.13835 | | Services: | Forum | Review | PDF | Favorites | |
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