The Per-Tau Shell: A Giant Star-forming Spherical Shell Revealed by 3D Dust Observations

Abstract A major question in the field of star formation is how molecular clouds form out diffuse interstellar medium (ISM). Recent advances 3D dust mapping are revolutionizing our view structure ISM. Using highest-resolution map to date, we explore a nearby star-forming region, which includes well-known Perseus and Taurus clouds. We reveal an extended near-spherical shell, 156 pc diameter (hereafter called “Per-Tau Shell”), embedded. also find large ring at location “Tau Ring”). discuss scenario for Per-Tau Shell, previous stellar supernova feedback events formed expanding where swept-up ISM has condensed both shell within it. present auxiliary observations H i , α 26 Al, X-rays that further support this scenario, estimate Shell’s age be ≈6–22 Myrs. The offers first observational phenomenon long-hypothesized theoretically, cloud triggered by feedback.