SiO collimated outflows driven by high-mass YSOs in G24.78+0.08

Context. The region G24.78+0.08, which is associated with a cluster of high-mass young stellar objects in different evolutionary stages, is one of the best laboratories to investigate massive star formation. Aims. We aim to image the molecular outflows towards G24.78+0.08 at high-angular resolution using SiO emission, which is considered the classical tracer of protostellar jets. In this way we study the mass loss process in which we previously detected a hypercompact ionised region, as well as rotation and infall signatures. Methods. We performed SiO observations with the VLA interferometer in the J = 1–0 v = 0 transition and with the SMA array in the 5–4 transition. A complementary IRAM 30-m single-dish survey in the (2–1), (3–2), (5–4), and (6–5) SiO lines was also carried out. Results. Two collimated SiO high-velocity (up to 25 km s-1 w.r.t. the systemic velocity) outflows driven by the A2 and C millimeter continuum massive cores have been imaged. On the other hand, we detected no SiO outflow driven by the young stellar objects in more evolved evolutionary phases that are associated with ultracompact (B) or hypercompact (A1) Hi