Browsing by Author "Dragovan, Mark"

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Cosmic Microwave Background Anisotropy Measurement from Python V
(2001-03-01) Coble, Kim; Dodelson, S.; Dragovan, Mark; et al.
We analyze observations of the microwave sky made with the Python exper- iment 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 ex- pected 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.
Galactic foreground constraints from the Python V cosmic microwave background anisotropy data
(2011-07-05) Mukherjee, Pia; Coble, Kim; Dragovan, Mark
We constrain Galactic foreground contamination of the Python V cosmic microwave background anisotropy data by cross correlating it with foreground contaminant emis- sion templates. To model foreground emission we use 100 and 12 µm dust templates and two point source templates based on the PMN survey. The analysis takes account of inter-modulation correlations in 8 modulations of the data that are sensitive to a large range of angular scales and also densely sample a large area of sky. As a conse- quence the analysis here is highly constraining. We ﬁnd little evidence for foreground contamination in a analysis of the whole data set. However, there is indication that foregrounds are present in the data from the larger-angular-scale modulations of those Python V ﬁelds that overlap the region scanned earlier by the UCSB South Pole 1994 experiment. This is an independent consistency cross-check of ﬁndings from the South Pole 1994 data.