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SUMMARY:The Polarization and Magnetic Field of the Radio Arc as Observed b
 y ALMA at 100 GHz
DTSTART;VALUE=DATE-TIME:20261028T181900Z
DTEND;VALUE=DATE-TIME:20261028T182000Z
DTSTAMP;VALUE=DATE-TIME:20261023T111421Z
UID:indico-contribution-3692@nyx.physics.mcgill.ca
DESCRIPTION:Speakers: Nora Salem ()\nThe unique Galactic Center non-therma
 l filaments (NTFs) have been a focus of investigations for over 40 years. 
 The most prominent manifestation of the NTFs is a bundle of parallel filam
 ents known as the Radio Arc. Radio polarimetric observations made with the
  Very Large Array (VLA) at 10 GHz have revealed an alternating magnetic fi
 eld pattern in the Radio Arc that could either be a result of multiple fie
 ld systems being encountered along the line of sight or an intrinsic featu
 re of the Radio Arc. These VLA observations were not able to distinguish b
 etween these possibilities due to the large rotation measures encountered 
 towards the source. We present ALMA 100 GHz observations of the Radio Arc 
 that are not impacted by significant Faraday effects. The observations rep
 orted here represent both the first time that ALMA has been used to study 
 the NTFs and the first time 100 GHz polarimetric observations have been co
 nducted on the Radio Arc. We find a uniformly rotated magnetic field with 
 respect to the NTF filament orientation\, with the angle of rotation being
  constant along the length of each filament. However\, we find a systemati
 cally different magnetic field orientation in different Radio Arc filament
 s. We use this field pattern to update our understanding of the line-of-si
 ght structures local to the Radio Arc. We find that the magnetic field inf
 erred from our ALMA observations is likely a result either of confusion fr
 om multiple magnetic field systems or because the polarization is centrall
 y concentrated within the NTF filaments.\n\nhttps://nyx.physics.mcgill.ca/
 event/587/contributions/3692/
LOCATION:Online 
URL:https://nyx.physics.mcgill.ca/event/587/contributions/3692/
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