GS121-05-037: a new Galactic chimney with signs of triggered star formation?

L. A. SUAD; J A MOLINA LERA; S. B. CÁRDENAS; A. B. BLANCO; DURONEA, N.U.; S. CICHOWOLSKI

Workshop; Workshop Science with LLAMA; 2022

MinCyT

In this work we present a study of the HI supershell GS121-05-037 and itsrole in triggering star formation.To characterize the supershell we analyzed the HI 21 cm line and the far-infrared emission distributions. In addition, to study the star formation processes related to GS121-05-037 we used the Gaia survey together withspectroscopic/photometric calculations and derived a method to look for massive OB-type stars. GS121-05-037 presents, in the HI emission distribution, an open morphology towards the Galactic halo, suggesting that this large structure could be a Galactic chimney. The analysis of the IR emission distribution reveals the presence of 32 HII regions seen projected into the borders of GS121-05-037. A spectroscopic/photometric analysis revealed that 12 of them would be located at a similar distance to GS121-05-037. The relative location among GS121-05-037 and the HII regions, together with their age difference led us to conclude that the ionizing stars could have been created due to the expansion of the HI supershell.On the other hand, the expansion and collision of supershells are believed to induce the formation of molecular gas in the compressed collision zones. However, observational examples of this phenomenon in action are rare. In this presentation, I will show some examples where colliding HI supershells may have been triggered the formation of molecular gas. Since several of these large structures are located at high galactic latitudes, LLAMA will be of great help to study this phenomenon.pre.cjk { font-family: "AR PL SungtiL GB", monospace }p { margin-bottom: 0.25cm; line-height: 120% }