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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-6301
DTSTART:20210201T180000Z
DTEND:20210201T190000Z
DTSTAMP:20260415T023554Z
LAST-MODIFIED:20210201T033900Z
LOCATION:https://uwmadison.zoom.us/j/96822123897?pwd=Z0ZESm1CNFRkUTVEM
 EIxM2RuN3h0UT09
SUMMARY:Monday Science Seminar w/ Benjamin Rosenwasser (UW-Madison)\, 
 Monday Science Seminar\, Benjamin Rosenwasser\, University of Wisconsi
 n - Madison
DESCRIPTION:Over the past decade the Cosmic Origins Spectrograph (COS)
  has obtained high S/N FUV spectra of hundreds of distant QSOs\, illum
 inating the gaseous structures that lie within the cosmic web at redsh
 ift < 1. Besides Lyman alpha forest absorption\, the next most common 
 type of absorber are low column density OVI absorbers\, often appearin
 g as apparent single components with one or two associated HI lines. M
 any studies have shown that the absorbers with large column densities 
 are in the inner regions of galaxy halos\, while the much more numerou
 s single component OVI absorbers have not been the subject of much scr
 utiny. We have been studying a large sample of 600 OVI absorbers\, and
  I will focus on our effort to characterize the galaxy environments of
  the common single component systems. We show that some appear to trac
 e halos\, but many are clearly isolated\, and sometimes embedded withi
 n filamentary structure traced by nearby galaxies on Mpc scales. We di
 scuss the possible origins and physical properties of the gas in this 
 intra-filament medium.<br>
\n
URL:https://www.physics.wisc.edu/events/?id=6301
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