Dr. Gerritt Verschuur
The University of Memphis
October 24, 2007
4:00 pm, Manning Hall room 201
Spatial associations have been found between interstellar neutral hydrogen (HI) emission
morphology and small-scale structure observed by the Wilkinson Microwave Anisotropy
Probe (WMAP). The HI distribution toward the brightest peaks in the WMAP Internal
Linear Combination (ILC) map for one area of sky is examined and by comparing with
a second area on the sky it is demonstrated that the associations do not appear to
be the result of chance coincidence.
Close examination of several of the associations reveals important new properties
of diffuse interstellar neutral hydrogen structure. Overall, the data suggest that
much of the small angular-scale structure observed by WMAP, which is widely interpreted
as having a cosmological origin (that is, related to the Big Bang), may in fact originate
in a previously unrecognized process occurring close to us in the Milky Way galaxy.