Milky Way low mass young stars from Gaia EDR3

A sub-sample of 52 clusters, selected among the 7323 found with DBSCAN, has been used as template data set to identify very young clusters from the pattern of the observed colour-absolute magnitude diagrams through a pattern-match process. We find 124440 candidate YSOs clustered in 354 SFRs and stellar clusters younger than 10Myr and within <~1.5kpc. In addition, 65 863 low-mass members of 322 stellar clusters located within ~500pc and with ages 10Myr<~t<~100Myr were also found.

The selected YSOs are spatially correlated with the well-known SFRs. Most of them are associated with well-concentrated regions or complex structures of the Galaxy, and a substantial number of them have been recognised for the first time. The massive SFRs, such as, for example, Orion, Sco-Cen, and Vela, located within 600-700 pc trace a very complex three-dimensional pattern, while the farthest ones seem to follow a more regular pattern along the Galactic plane.