Search Publications
Gaia Data Release 1. Astrometry: one billion positions, two million proper motions and parallaxes
Mora, A.; Jordan, S.; Figueras, F. +80 more
Context. Gaia Data Release 1 (DR1) contains astrometric results for more than 1 billion stars brighter than magnitude 20.7 based on observations collected by the Gaia satellite during the first 14 months of its operational phase.
Aims: We give a brief overview of the astrometric content of the data release and of the model assumptions, data p…
Planck 2015 results. X. Diffuse component separation: Foreground maps
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +237 more
Planck has mapped the microwave sky in temperature over nine frequency bands between 30 and 857 GHz and in polarization over seven frequency bands between 30 and 353 GHz in polarization. In this paper we consider the problem of diffuse astrophysical component separation, and process these maps within a Bayesian framework to derive an internally co…
Planck 2015 results. XV. Gravitational lensing
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +227 more
We present the most significant measurement of the cosmic microwave background (CMB) lensing potential to date (at a level of 40σ), using temperature and polarization data from the Planck 2015 full-mission release. Using a polarization-only estimator, we detect lensing at a significance of 5σ. We cross-check the accuracy of our measurement using t…
Planck intermediate results. XLVII. Planck constraints on reionization history
Miville-Deschênes, M. -A.; Boulanger, F.; Bernard, J. -P. +165 more
We investigate constraints on cosmic reionization extracted from the Planck cosmic microwave background (CMB) data. We combine the Planck CMB anisotropy data in temperature with the low-multipole polarization data to fit ΛCDM models with various parameterizations of the reionization history. We obtain a Thomson optical depth τ = 0.058 ± 0.012 for …
Planck 2015 results. XVI. Isotropy and statistics of the CMB
Kim, J.; Miville-Deschênes, M. -A.; Boulanger, F. +242 more
We test the statistical isotropy and Gaussianity of the cosmic microwave background (CMB) anisotropies using observations made by the Planck satellite. Our results are based mainly on the full Planck mission for temperature, but also include some polarization measurements. In particular, we consider the CMB anisotropy maps derived from the multi-f…
Planck intermediate results. XXX. The angular power spectrum of polarized dust emission at intermediate and high Galactic latitudes
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +231 more
The polarized thermal emission from diffuse Galactic dust is the main foreground present in measurements of the polarization of the cosmic microwave background (CMB) at frequencies above 100 GHz. In this paper we exploit the uniqueness of the Planck HFI polarization data from 100 to 353 GHz to measure the polarized dust angular power spectra C
Planck intermediate results. XLVI. Reduction of large-scale systematic effects in HFI polarization maps and estimation of the reionization optical depth
Miville-Deschênes, M. -A.; Boulanger, F.; Bernard, J. -P. +170 more
This paper describes the identification, modelling, and removal of previously unexplained systematic effects in the polarization data of the Planck High Frequency Instrument (HFI) on large angular scales, including new mapmaking and calibration procedures, new and more complete end-to-end simulations, and a set of robust internal consistency check…
Second ROSAT all-sky survey (2RXS) source catalogue
Haberl, F.; Nandra, K.; Freyberg, M. J. +3 more
Aims: We present the second ROSAT all-sky survey source catalogue, hereafter referred to as the 2RXS catalogue. This is the second publicly released ROSAT catalogue of point-like sources obtained from the ROSAT all-sky survey (RASS) observations performed with the position-sensitive proportional counter (PSPC) between June 1990 and August 199…
Planck 2015 results. XIX. Constraints on primordial magnetic fields
Kim, J.; Miville-Deschênes, M. -A.; Bernard, J. -P. +230 more
We compute and investigate four types of imprint of a stochastic background of primordial magnetic fields (PMFs) on the cosmic microwave background (CMB) anisotropies: the impact of PMFs on the CMB temperature and polarization spectra, which is related to their contribution to cosmological perturbations; the effect on CMB polarization induced by F…
Planck 2015 results. XXII. A map of the thermal Sunyaev-Zeldovich effect
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +199 more
We have constructed all-sky Compton parameters maps, y-maps, of the thermal Sunyaev-Zeldovich (tSZ) effect by applying specifically tailored component separation algorithms to the 30 to 857 GHz frequency channel maps from the Planck satellite. These reconstructed y-maps are delivered as part of the Planck 2015 release. The y-maps are characterized…