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postscript
PPEUC CMB index
1 Observations...
clusterR. B. Partridge
Haverford College
down to 
. The data from this
field, combined with a somewhat shorter integration on another field,
establishes the following limits on 
at 
confidence level:
12.8, 4.8 and 
at angular scales of 
and 
, respectively.
Near the center of this field, an isolated, negative feature was found. It was
with a peak central amplitude
of 250 
. We interpret it as the Sunyaev--Zel'dovich signal from a
high redshift cluster. Interestingly, within about 
of this
decrement, lie two radio-quiet quasars both at 
. If the signal is
from a cluster of galaxies, failure to observe the source in a deep ROSAT
exposure suggests its redshift must exceed 1.5. There is no optical evidence
from the MDS survey frames for a cluster in the vicinity of the microwave
decrement, again suggesting high redshift.
This detection is very similar to one to be discussed at this conference by the Cambridge group; I suggest we refer to these objects as ``Black Clouds'' to honor Sir Fred Hoyle.