@2018MNRAS.476..381W give an excellent overview on the importance of the Sco-Cen complex for questions related to the modes of star formation. Using the observations from [[*Gaia*]{}]{}DR1 they confirmed that all three subgroups US, UCL and LCC are gravitationally unbound, and found neither evidence for expansion of the subgroups nor that they, or part of them, were formed by the disruption of star clusters.

[[ Using the Hipparcos data and a convergent point method, @1999AJ....117..354D found extended moving groups in the area of Sco-Cen, one in each sub-group. However, they and subsequent authors could only detect stars with masses typically above 0.7 M$_\odot$. The situation was best described by @Preib08: “the surface of the census of low-mass Sco-Cen members has barely been scratched." In this paper, we use the results of [[*Gaia*]{}]{}DR2 [@Brown18] to uncover a large population of young stellar objects located in the LCC area of the Sco-Cen region. About 70 per cent of these stars belong to a large moving group and assemble in several subgroups of increasing age.]{}]{}

The paper is structured as follows: In Section\[detect\] we describe the identification of the [[ moving group and its sub-groups]{}]{} in the TGAS and [[*Gaia*]{}]{} DR2 catalogs; in Section\[massage\] 