Predicted Planck extragalactic point-source catalogue

An estimation of the number and amplitude (in flux) of the extragalactic po int sources that will be observed by the Planck Mission is presented in thi s paper. The study is based on the Mexican Hat wavelet formalism introduced by Cayon et al. Simulations at Planck observing frequencies are analysed, taking into account all the possible cosmological, Galactic and extragalact ic emissions together with noise. With the technique used in this work, the Planck Mission will produce a catalogue of extragalactic point sources abo ve the following flux values: 1.03 Jy (857 GHz), 0.53 Jy (545 GHz), 0.28 Jy (353 GHz), 0.24 Jy (217 GHz), 0.32 Jy (143 GHz), 0.41 Jy (100 GHz, high-fr equency instrument), 0.34 Jy (100 GHz, low-frequency instrument), 0.57 Jy ( 70 GHz), 0.54 Jy (44 GHz) and 0.54 Jy (30 GHz), which are only slightly mod el dependent (see text). Amplitudes of these sources are estimated with err ors below similar to 15 per cent. Moreover, we also provide a complete cata logue (for the point-source simulations analysed) with errors in the estima tion of the amplitude below similar to 10 per cent. In addition we discuss the possibility of identifying different point-source populations in the Pl anck catalogue by estimating their spectral indices.