ALMAGAL VIII. Early phases of triggered star formation in source AG286.0716$-$1.8229
C. Mininni, S. Molinari, W.J. Kim, E. Schisano, F. Fontani, A. Traficante, A. Nucara, A. Coletta, H.T. Lee, \'A. Sanchez-Monge, M. Benedettini, D. Elia, S. Pezzuto, V.M. Pelkonen, P. Schilke, C. Battersby, P.T.P. Ho, M. Beltr\'an, H. Beuther, G.A. Fuller, B. Jones, R.S. Klessen

TL;DR
This study investigates early triggered star formation in source AG286.0716$-$1.8229 using ALMA and archival data, revealing multiple cores aligned along an arch consistent with triggered star formation scenarios.
Contribution
First high-resolution ALMA observations of cores in AG286.0716$-$1.8229, supporting triggered star formation models through core distribution and properties analysis.
Findings
Detected nine cores, with eight along an arch of radius 0.75 pc.
Cores have virial parameters mostly below 2, indicating gravitational binding.
Core properties align with models of triggered star formation.
Abstract
Several theoretical and observational studies have shown that new waves of triggered star-formation can be induced by the feedback from newly formed massive protostars, due to the expansion of H II regions. We used the millimeter dust continuum data of the ALMAGAL survey and the Anderson et al. 2014 catalog of H II regions and selected one ALMAGAL source for ALMA follow-up observations. In fact, in source AG286.07161.8229 six cores were detected at a resolution of au, but only two at a higher resolution. The 4 cores not detected at higher resolution are prestellar core candidates. We used archival data from the SMGPS and RACS to confirm whether an H II region is present in the field. We observed the source with with ALMA in Band 4, covering the emission of DCO (21), ND (21), DCN (21), and CHCCH (98), to estimates whether these cores are in an…
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