Events Calendar

Dr. Chat Hull, Multi-scale observations of dust polarization

Date:
Thursday, May 19, 2016
Time:
1:30 pm - 2:30 pm
Location:
Physics & Astronomy Building (PAB)
Room: 100
Cost:
Free

Department of Physics and Astronomy

PHYSICS & ASTRONOMY COLLOQUIUM

Dr. Chat Hull

Harvard-Smithsonian Center for Astrophysics
National Radio Astronomy Observatory

“Multi-scale observations of dust polarization in star-forming clouds, cores, envelopes, and disks”

ABSTRACT

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 show filamentary structure near young, Class 0 protostellar sources in the Serpens Main star-forming region, as seen with both CARMA (at 1000 AU scales) and ALMA (at 150 AU scales!). The new, high-resolution ALMA polarization observations reveal a number of filamentary structures surrounding the protostars. The magnetic fields are parallel with the filaments' long axes, and all lead to the central source, indicating that we may be witnessing magnetized accretion flows onto individual protostars for the very first time.

Coffee will be available in the Atrium, 2nd floor, at 1:15 p.m.

We look forward to seeing you at the Colloquium! As a courtesy to the speaker and audience, please set your cellphones to “silent” mode. Thanks!

Host:
Prof. Shantanu Basu
Contact:
Jodi Guthrie - Assistant to the Chair
jodi@uwo.ca
519-661-2111 x.86438
Event Type:


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