Overall distributions of molecular gas. Panel (a): Observed area as seen on the Herschel hydrogen molecule column density map. The black box is the 5′ × 5′observation box. The five enclosed red contours indicate the dense cores identified by astrodendro (see Table 1 for the core numbers). The yellow dot located at the centre is the position of the protostar. The blue dots show the positions of the starless cores identified by Pezzuto et al. (2021). Panels (b)–(d): Velocity-integrated maps (from 6.0 to 8.5 km s⁻¹) of CCS (J_N = 4₃ − 3₂) (b), HC₃N (J = 5 − 4) (c), and HC₅N (J = 17 − 16) (d) observed with the NRO 45 m telescope. The red lines follow the large-scale filament in this area. The filament is more prominent in a map that covers a larger area (see Fig. D.1). The blue ellipses in panels (b), (c), and (d) are the map effective beam size.