A High-Resolution Map of the Cosmic Microwave Background around the North Celestial Pole

摘要

We present a Wiener-filtered map of the cosmic microwave background (CMB) fluctuations in a cap with 15 deg diameter, centered at the north celestial pole. The map is based on the 19931995 data from the Saskatoon (SK) experiment, with an angular resolution around 1 deg in the frequency range 27.644.1 GHz. The signal-to-noise ratio in the map is of order 2, and some individual hot and cold spots are significant at the 5 σ level. The spatial features are found to be consistent from year to year, which reinforces the conclusion that the SK results are not dominated by residual atmospheric contamination or other noncelestial signals.