Oral Presentation

Probing the multi-scale magnetic field structure in clumps by combining JCMT, SMA and ALMA polarisation - STREAMS

Author(s): Seamus Clarke (NCKU), Ya-Wen Tang (ASIAA), Ingrid Tseng (ASIAA/NTU), Patrick Koch (ASIAA), Gary Fuller (Manchester/Cologne), Nicolas Peretto (Cardiff)

Presenter: Seamus Clarke (NCKU)

To understand the star formation process, one must understand the process of fragmentation from the cloud-scale down. Theoretical studies have shown that fragmentation is greatly affected by the balance of the magnetic field, gravity and turbulence. Observationally, some studies have quantified the energetics of each of these three forces, calculated their relative importance, and related it to B-field morphology and fragmentation; however, most such studies have been limited to single spatial scales or confined to small numbers of objects. In this talk I will introduce the ongoing STREAMS project, which combines JCMT, SMA and ALMA polarisation and molecular line observations, at 14'', 4'' and 1'' respectively, to ensure no significant jumps in resolution. These observations provide a multi-scale view of the relative importance of the B-field, turbulence and gravity, its link to fragmentation across a large sample of 23 massive clumps.