The Young Stellar Population, Distance, and Cloud–Cloud Collision Induced Star Formation Scenario of the Trifid Nebula

The Trifid Nebula is a young, nearby star-forming region where star formation proposed to have been triggered by cloud-cloud collision (CCC), based on observations of molecular clouds. It offers unique opportunity test whether the CCC hypothesis supported spatial distribution and chronology young stars. We present first study optically visible pre-main sequence (PMS) population using riH$\alpha$ imaging Gaia astrometry. Combined with an analysis stellar objects (YSOs) infrared imaging, we capture population. From analysis, 15 Flat/Class I YSOs, 46 Class II 41 accreting PMS stars are identified (diskless/non-accreting sources not included in analysis). distance parallaxes $\sim$1250 pc, significantly closer than previously reported. YSOs ($\sim$1.5 Myr old) spread toward edge They slightly younger estimated crossing time $\sim$2.7Myr dynamical age $\sim$0.85 Myr. Younger more concentrated spatially. There exists cavity devoid two clouds overlap. This evidence suggests that current generation formed after $\sim$1 ago, this result can be corroborated future spectroscopic studies.