Planck 2015 results VIII. High Frequency Instrument data processing: Calibration and maps
Metadatos
Mostrar el registro completo del ítemAutor
Battaner López, EduardoEditorial
EDP Sciences
Materia
Cosmology: observations Cosmic background radiation Surveys Methods: data analysis
Fecha
2016Referencia bibliográfica
Adam, R., Ade, P. A., Aghanim, N., Arnaud, M., Ashdown, M., Aumont, J., ... & Battaner, E. (2016). Planck 2015 results-VIII. High Frequency Instrument data processing: Calibration and maps. Astronomy & Astrophysics, 594, A8. [DOI: 10.1051/0004-6361/201525820]
Patrocinador
Planck (http://www.esa.int/Planck) is a project of the European Space Agency (ESA) with instruments provided by two scientific consortia funded by ESA member states and led by Principal Investigators from France and Italy, telescope reflectors provided through a collaboration between ESA and a scientific consortium led and funded by Denmark, and additional contributions from NASA (USA).Resumen
This paper describes the processing applied to the cleaned, time-ordered information obtained from the Planck High Frequency Instrument (HFI)
with the aim of producing photometrically calibrated maps in temperature and (for the first time) in polarization. The data from the entire 2.5-year
HFI mission include almost five full-sky surveys. HFI observes the sky over a broad range of frequencies, from 100 to 857 GHz. To obtain the best
accuracy on the calibration over such a large range, two different photometric calibration schemes have been used. The 545 and 857 GHz data are
calibrated using models of planetary atmospheric emission. The lower frequencies (from 100 to 353 GHz) are calibrated using the time-variable
cosmological microwave background dipole, which we call the orbital dipole. This source of calibration only depends on the satellite velocity with
respect to the solar system. Using a CMB temperature of TCMB = 2.7255 ± 0.0006 K, it permits an independent measurement of the amplitude
of the CMB solar dipole (3364.3 ± 1.5 µK), which is approximatively 1σ higher than the WMAP measurement with a direction that is consistent
between the two experiments. We describe the pipeline used to produce the maps of intensity and linear polarization from the HFI timelines, and
the scheme used to set the zero level of the maps a posteriori. We also summarize the noise characteristics of the HFI maps in the 2015 Planck data
release and present some null tests to assess their quality. Finally, we discuss the major systematic effects and in particular the leakage induced by
flux mismatch between the detectors that leads to spurious polarization signal.