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PRODID:UW-Madison-Physics-Events
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SEQUENCE:2
UID:UW-Physics-Event-8245
DTSTART:20230420T160000Z
DTEND:20230420T180000Z
DTSTAMP:20260414T053038Z
LAST-MODIFIED:20230418T143209Z
LOCATION:2124 Chamberlin or https://uwmadison.zoom.us/j/95855625584?pw
 d=TG1heWJUb294Vy8zVnFMWDdrYTVKdz09
SUMMARY:Unraveling the Dynamics of the Milky Way: Investigations into 
 the Asymmetries of the Galactic Disk\, Preliminary Exam\, Lekshmi Thul
 asidharan\, Physics Graduate Student
DESCRIPTION:"The Radcliffe wave (RW) is a recently discovered sinusoid
 al vertical feature of dense gas in the proximity of the Sun. In the d
 isk plane\, it is aligned with the Local Arm. However\, the origin of 
 its vertical undulation is still unknown. This study constrains the ki
 nematics of the RW\, using young stars and open clusters as tracers\, 
 and explores the possibility of this oscillation being part of a more 
 extended vertical mode. We study the median vertical velocity trends o
 f the young stars and clusters along with the RW and extend it further
  to the region beyond it. We discovered a kinematic wave in the Galaxy
 \, distinct from the warp\, with the amplitude of oscillation dependin
 g on the age of the stellar population. We performed a similar analysi
 s in the N-body simulation of a satellite as massive as the Sagittariu
 s dwarf galaxy impacting the galactic disk. When projected in the plan
 e\, the spiral density wave induced by the satellite impact is aligned
  with the RW\, suggesting that both may be the response of the disk to
  an external perturbation. However\, the observed kinematic wave is mi
 saligned. It appears as a kinematic wave travelling radially\, winding
  up faster than the density wave matched by the RW\, setting its origi
 ns into question. If a satellite galaxy is indeed responsible for the 
 presence of this kinematic wave\, we predict the existence of a vertic
 al velocity dipole that would be expected to form across the disk. The
  reality of this prediction may be measurable with the upcoming Gaia D
 R3 and DR4."
URL:https://www.physics.wisc.edu/events/?id=8245
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