J/A+A/578/A44 Map of foreground masks for Planck (Axelsson+, 2015) ================================================================================ Testing for foreground residuals in the Planck foreground cleaned maps: A new method for designing confidence masks. Axelsson M., Ihle H.T., Scodeller S., Hansen F.K. =2015A&A...578A..44A ================================================================================ ADC_Keywords: Positional data Keywords: cosmic background radiation - cosmology: observations - methods: numerical Abstract: We test for foreground residuals in the foreground cleaned Planck Cosmic Microwave Background (CMB) maps outside and inside U73 mask commonly used for cosmological analysis. The aim of this paper is to introduce a new method to validate masks by looking at the differences in cleaned maps obtained by different component separation methods. By analyzing the power spectrum as well as the mean, variance and skewness of needlet coefficients on bands outside and inside the U73 mask we first confirm that the pixels already masked by U73 are highly contaminated and cannot be used for cosmological analysis. We further find that the U73 mask needs extension in order to reduce large scale foreground residuals to a level of less than 20% of the standard deviation of CMB fluctuations within the bands closest to the galactic equator. We also find 276 point sources in the cleaned foreground maps which are currently not masked by the U73 mask. Our final publicly available extended mask leaves 65.9% of the sky for cosmological analysis. Note that this extended mask may be important for analyses on local sky patches; in full sky analyses the additional residuals near the galactic equator may average out. Description: FITs file contains an nside=2048 healpix map of our confidence mask that masks 65.9% of the sky. The pixel convention used is: ring order. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file list.dat 60 1 Informations of FITS file mask.fits 2880 69908 FITS file (Healpix mask) -------------------------------------------------------------------------------- Byte-by-byte Description of file: list.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 I5 --- Nmasks [49152] Number of masks 7- 12 I6 Kibyte size [196616] Size of the FITS file 14- 38 A25 --- FileName Name of the FITS file 40- 60 A21 --- Title Title of the file -------------------------------------------------------------------------------- Acknowledgements: Magnus Axelsson, magnus.axelsson(at)astro.uio.no ================================================================================ (End) Patricia Vannier [CDS] 24-Mar-2015