Optimized in-flight absolute calibration for extended CMB surveys (Articolo in rivista)

Type
Label
  • Optimized in-flight absolute calibration for extended CMB surveys (Articolo in rivista) (literal)
Anno
  • 2003-01-01T00:00:00+01:00 (literal)
Alternative label
  • Cappellini, B., Maino, D., Albetti, G., Platania, P., Paladini, R., Mennella, A., Bersanelli, M. (2003)
    Optimized in-flight absolute calibration for extended CMB surveys
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Cappellini, B., Maino, D., Albetti, G., Platania, P., Paladini, R., Mennella, A., Bersanelli, M. (literal)
Pagina inizio
  • 375 (literal)
Pagina fine
  • 383 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 409 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Titolo
  • Optimized in-flight absolute calibration for extended CMB surveys (literal)
Abstract
  • Accurate measurements of the Cosmic Microwave Background (CMB) anisotropy call for high precision and reliability of the in-flight calibration. For extended surveys the CMB dipole provides an excellent calibration source at frequencies lower than ~ 200 GHz; however poorly known foreground emissions, such as diffuse galactic components, complicate the signal and introduce a systematic error in the calibration. We show that introducing a weight function that takes into account the uncertainty in the a priori knowledge of the sky, allows us to substantially improve the calibration accuracy with respect to methods involving galactic latitude cuts. This new method is tested for PLANCK-LFI radiometers at 30 and 100 GHz. On short time scales (less than 1 day) the absolute calibration of each channel can be recovered with an overall 1-2% accuracy. We also consider the effect of CMB anisotropy itself on the calibration, and find that knowledge of the CMB pattern on large scales is needed to keep the short-time scale calibration accuracy within 1%. (literal)
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