This page is a transcript of a scientific debriefing, likely involving Dr. Henry, discussing astronomical observations including the Coma cluster, X-ray backgrounds, and UV radiation measurements.
119
HENRY
(CONT'D) gravitationally holding it together. We though it might be
in the form of ionized hydrogen. We looked for Lyman-alpha
radiation, red shifted from the ionized hydrogen, and we
didn't see any. We set a lower limit, which certainly ex-
cludes the possibility that the Coma cluster is held together
by this ionized hydrogen. I think that may leave a real
mystery as to what is holding the thing together.
The fourth point may turn out to be the most interesting
thing of all. When you look in the Milky Way, you see a
lot of UV coming from the stars, but the question is, what
do you see when you look up to the North Galactic Pole or
down to the South Galactic Pole. One of the most exciting
results of X-ray astronomy was the fact that an X-ray back-
ground was observed over the sky that nobody had expected,
and part of this is the gamma-ray background that Dr. Trombka
talked about. In the UV, nobody knows, but you never know
until you look. You do have to deal with this background
of stars that we know is there. So we did look at a large
number of different points at high galactic latitudes, both
north and south. The spectrum that we see is above this
dark count. In other words, this abnormally high dark
current did not, in fact, interfere with that experiment.
The spectrum that we see looks like the spectrum of the hot
