One, Two, Three ... An Explosive Outflow in IRAS 12326-6245 Revealed by ALMA

FERNÁNDEZ-LÓPEZ, MANUEL; ZAPATA, LUIS A.; SKRETAS, I. M.; GUZMÁN CCOLQUE, ESTRELLA; MENTEN, KARL M.; PALAU, AINA; LEURINI, SILVIA; RODRÍGUEZ, LUIS F.; WYROWSKI, FRIEDRICH

The Astrophysical Journal Letters

American Astronomical Society

Año: 2023 vol. 956

2041-8205

In the last years there has been a substantial increase in the number of the reported massive and luminous starforming regions with related explosive outflows thanks to the superb sensitivity and angular resolution provided bythe new radio, infrared, and optical facilities. Here, we report one more explosive outflow related with the massiveand bright star-forming region IRAS 12326−6245 using Band 6 sensitive and high-angular-resolution (∼0 2)Atacama Large Millimeter/Submillimeter Array observations. We find over 10 molecular and collimated welldefined streamers, with Hubble–Lemaitre–like expansion motions, and pointing right to the center of a dusty andmolecular shell (reported for the first time here) localized in the northern part of the UC H II region known asG301.1A. The estimated kinematic age and energy for the explosion are ∼700 yr and 1048 erg, respectively.Taking into account the recently reported explosive outflows together with IRAS 12326−6245, we estimate anevent rate of once every 90 yr in our Galaxy, similar to the formation rate of massive stars.