Overview of the studied region. H₂ column density map from Ladjelate et al. (2020) derived from Herschel data. Orange circles mark the location of the targeted sources and red stars mark the nearby massive stars HD147899 and S1. The red arrows point to the direction of the surrounding massive stars σ-Sco, α-Sco, and ρ-Oph, located at distances of ∼4.2–4.3, ∼4.3–5.2, and ∼2.3–3.1 pc from the protostars, respectively.