ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions $-$ XVII. High-mass star-formation through a large-scale collapse in IRAS 15394$-$5358

• DOI: 10.48550/arxiv.2409.19204
• Publication Date: 2024-09-27
• Authors: Swagat Ranjan Das; Manuel Merello; L. Bronfman; Tie Liu; Guido Garay; Amelia M. Stutz; Diego Mardones; Jianwen Zhou; Patricio Sanhueza; Hongli Liu; Enrique Vázquez-S...; Gilberto C. Gómez; Aina Palau; Anandmayee Tej; Fengwei Xu; Tapas Baug; L. K. Dewangan; Jinhua He; Lei Zhu; Shanghuo Li; M. Juvela; Anindya Saha; Namitha Issac; Jihye Hwang; Hafiz Nazeer; L. Viktor Toth
• Keywords: Star (game theory); High mass

Hub-filament systems are considered as natural sites for high-mass star formation. Kinematic analysis of the surroundings hub-filaments is essential to better understand formation within such systems. In this work, we present a detailed study massive Galactic protocluster IRAS 15394$-$5358, using continuum and molecular line data from ALMA Three-millimeter Observations Massive Star-forming Regions (ATOMS) survey. The 3~mm dust map reveals fragmentation ($\rm M=843~M_{\odot}$) clump into six cores. core C-1A largest (radius = 0.04~pc), most M=157~M_{\odot}$), lies dense central region, along with two smaller cores M=7~and~3~M_{\odot}$). process consistent thermal Jeans mechanism virial shows that all have small parameter values \alpha_{vir}<<2$), suggesting gravitationally bound. mass vs. radius relation indicates three can potentially form at least single star. integrated intensity $\rm H^{13}CO^{+}$ associated hub-filament system, where hub linked four filaments. A sharp velocity gradient observed towards hub, global collapse filaments actively feeding hub. We discuss role possible driving mechanisms activity in protocluster.