University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Friday, April 24th 2015
Speaker: Chat Hull, Center for Astrophysics
Subject: From Filaments, to Core, to...Filaments?! The Role of Magnetic Fields in Multi-Scale, Filamentary Star Formation

In just the past few years, it has become clear that filamentary structure is present in the star-formation process across many orders of magnitude in spatial scale, from the galactic scales probed by Planck and Herschel all the way down to the AU-scale structures that ALMA has revealed within protoplanetary disks. A similar story can be told of magnetic fields, which play a role in star formation across the same vast range of size scales. Here I will first review my work on 1000 AU-scale dust polarization and magnetic fields in Class 0 protostellar envelopes, which were observed as part of the TADPOL survey using the 1.3 millimeter dual-polarization receiver system at CARMA. I will then highlight two 1000 AU-scale filamentary structures seen with CARMA before I reveal new, high resolution (150 AU!) ALMA 1.3 mm continuum observations of three protostars in Serpens. Even at such high resolution, these sources have a number of nearby, filamentary blobs/condensations/ companions, most of which coincide in a tantalizing way with the magnetic fields we mapped with CARMA. I will muse on what this all means, and on what questions may soon be answered by ALMA polarization observations of the same three sources.

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