BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-8595
DTSTART:20240208T213000Z
DTEND:20240208T223000Z
DTSTAMP:20260408T114748Z
LAST-MODIFIED:20240126T152400Z
LOCATION:4421 Sterling Hall
SUMMARY:X-Ray Spectroscopic Insights Into the Microphysics of Collisio
 nless Shocks\, Astronomy Colloquium\, Ehud Behar\, Technion
DESCRIPTION:The theory of collisionless shocks is well established and
  explains a multitude of astrophysical phenomena\, while their microph
 ysics is extremely difficult to probe with observations.<br>\nNarrow r
 adiative recombination continua are the smoking gun of highly ionized 
 species recombining with cold (kT ~ eV) electrons.<br>\nThey are natur
 ally observed in photo-ionized plasmas of active galaxies and X-Ray bi
 naries\, but what are they doing in hot (kT ~ keV) shocked plasmas\, s
 uch as those observed in colliding wind binaries\, supernova remnants\
 , planetary nebulae\, and novae?<br>\nThe talk will present line-resol
 ved X-ray spectra of these sources\, the highlight of which will be sp
 ectacular XMM-Newton and Chandra X-ray observations of the 2020 nova Y
 Z Ret. <br>\nThe data provide a unique insight into the microphysics o
 f shocked gases that no other measurement can\, delivering unambiguous
  evidence for hot shocked gas directly mixing with cold electrons and 
 neutral atoms\, likely right around the shock front. 
URL:https://www.physics.wisc.edu/events/?id=8595
END:VEVENT
END:VCALENDAR