Cosmic microwave background anisotropy measurement from Python V

• Main Authors: Coble, K., Dodelson, S., Dragovan, M., Ganga, K., Knox, L., Kovac, J., Ratra, B., Souradeep, T.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Institute of Physics 2003
• Subjects: QC Physics; Amundsen Scott South Pole Station; Amundsen-Scott; Amundsen-Scott South Pole Station; South Pole; Antarc*; Antarctica; South pole
• Online Access: http://repository.ias.ac.in/107498/; http://iopscience.iop.org/article/10.1086/345714/meta#

We analyze observations of the microwave sky made with the Python experiment in its fifth year of operation at the Amundsen-Scott South Pole Station in Antarctica. After modeling the noise and constructing a map, we extract the cosmic signal from the data. We simultaneously estimate the angular power spectrum in eight bands ranging from large (ℓ ~ 40) to small (ℓ ~ 260) angular scales, with power detected in the first six bands. There is a significant rise in the power spectrum from large to smaller (ℓ ~ 200) scales, consistent with that expected from acoustic oscillations in the early universe. We compare this Python V map to a map made from data taken in the third year of Python. Python III observations were made at a frequency of 90 GHz and covered a subset of the region of the sky covered by Python V observations, which were made at 40 GHz. Good agreement is obtained both visually (with a filtered version of the map) and via a likelihood ratio test.