Detection of a Multiphase Intragroup Medium: Results from the COS-IGrM
  Survey
  We present the results of the COS Intragroup Medium (COS-IGrM) Survey that
used the Cosmic Origins Spectrograph on the Hubble Space Telescope to observe a
sample of 18 UV bright quasars, each probing the intragroup medium (IGrM) of a
galaxy group. We detect Ly$\alpha$, C II, N V, Si II, Si III, and O VI in
multiple sightlines. The highest ionization species detected in our data is O
VI, which was detected in 8 out of 18 quasar sightlines. The wide range of
ionization states observed provide evidence that the IGrM is patchy and
multiphase. We find that the O VI detections generally align with radiatively
cooling gas between $10^{5.8}$ and $10^6$ K. The lack of O VI detections in 10
of the 18 groups illustrates that O VI may not be the ideal tracer of the
volume filling component of the IGrM. Instead, it either exists at trace levels
in a hot IGrM or is generated in the boundary between the hotter IGrM and
cooler gas.
