The effect of the detector response time on bolometric cosmic microwave background anisotropy experiments |
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Authors: | S Hanany A H Jaffe & E Scannapieco |
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Institution: | The Center for Particle Astrophysics, University of California, Berkeley, 301 Le Conte Hall, Berkeley, CA 94720-7304, USA,;Physics Department, University of California, Berkeley, CA 94720, USA |
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Abstract: | We analyse the effects of the detector response time on bolometric measurements of the anisotropy of the cosmic microwave background (CMB). We quantify the effect in terms of a single dimensionless parameter L defined as the ratio between the time the beam sweeps its own size and the bolometer response time. As L decreases below ~ 2.5, the point-source response of the experiment becomes elongated. We introduce a window function matrix based on the timestream data to assess the effects of the elongated beam. We find that the values of the window function matrix elements decrease slowly as a function of L . Our analysis and results apply to other cases of beam asymmetry. For the High Frequency Instrument on board the Planck Surveyor satellite we show that, for a broad range of L , the ability of the experiment to extract the cosmological parameters is not degraded. Our analysis enhances the flexibility in tuning the design parameters of CMB anisotropy experiments. |
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Keywords: | methods: data analysis methods: observational cosmic microwave background |
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