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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-7939
DTSTART:20220929T203000Z
DTEND:20220929T213000Z
DTSTAMP:20260423T072219Z
LAST-MODIFIED:20220921T182602Z
LOCATION:Sterling Hall 4421\; or via Zoom: https://uwmadison.zoom.us/j
 /94638296290?pwd=YmJLMFh2VlFIQmxDcnF3ejk0ajlzQT09&from=addon
SUMMARY:Galactic HII Regions and Structure in the Milky Way\, Astronom
 y Colloquium\, Trey Wenger\, NSF Astronomy & Astrophysics Postdoctoral
  Fellow
DESCRIPTION:Radio recombination lines (RRLs) are an unobscured tracer 
 of ionized gas in both the diffuse interstellar medium (ISM) as well a
 s high-mass star forming regions. The Green Bank Telescope HII Region 
 Discovery Survey (HRDS) and its successors have more than doubled the 
 number of known high-mass star forming regions in the Milky Way by det
 ecting RRL emission toward infrared-identified HII region candidates. 
 HII regions are the classic tracer of structure in galaxies\, and thei
 r physical conditions (e.g.\, metallicity\, internal kinematics) infor
 m models of high-mass star formation and Galactic chemodynamical evolu
 tion. I will give a brief overview of our latest HRDS project\, the So
 uthern HII Region Discovery Survey\, and some preliminary results with
  the first Galaxy-wide flux-limited HII region sample\, including a no
 vel technique to constrain Milky Way spiral structure. In the SHRDS\, 
 we serendipitously discovered a population of HII regions with ionized
  gas velocity gradients. I will discuss both the origin and implicatio
 ns of this discovery on models of high-mass star formation as well the
  future of Galactic structure and HII region science (both Galactic an
 d extragalactic) in the era of ALMA and ngVLA.
URL:https://www.physics.wisc.edu/events/?id=7939
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