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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-4662
DTSTART:20171215T213000Z
DURATION:PT1H0M0S
DTSTAMP:20260416T003044Z
LAST-MODIFIED:20171211T164321Z
LOCATION:2241 Chamberbelin
SUMMARY:The Missing Metals in the Universe\, Physics Department Colloq
 uium\, Joel Bregman\, Univ. Michigan - Ann Arbor
DESCRIPTION:After the Big Bang nucleosynthesis period\, H and He were 
 present\, but not significant amounts of heavier materials\, such as C
 \, N\, O\, Si\, Fe\, or Pb. These heavier elements\, known collectivel
 y as “metals” to astronomers\, were produced by several types of s
 tars and stellar events\, including low and high mass supernovae and t
 he merger of neutron stars (kilonovae). The cosmic mass density of suc
 h metals is inferred from direct observations of supernovae and from t
 he cosmic history of star formation. Previous observations to detect t
 hese metals in the local Universe find that 70-90% are unaccounted for
  (“missing metals”). This missing metals problem can be resolved i
 f most of the metals lie in hot dilute gas surrounding galaxies and in
  the cosmic web. We discuss the detection of these metals in hot envir
 onments using X-ray astronomy and the tools needed for future observat
 ions. 
URL:https://www.physics.wisc.edu/events/?id=4662
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