Search Publications
Baryon acoustic oscillations in the Lyα forest of BOSS DR11 quasars
Pâris, Isabelle; Petitjean, Patrick; Aubourg, Éric +35 more
We report a detection of the baryon acousticoscillation (BAO) feature in the flux-correlation function of the Lyα forest of high-redshift quasars with a statistical significance of five standard deviations. The study uses 137 562 quasars in the redshift range 2.1 ≤ z ≤ 3.5 from the data release 11 (DR11) of the Baryon Oscillation Spectroscopic Sur…
Planck intermediate results. XIX. An overview of the polarized thermal emission from Galactic dust
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +200 more
This paper presents an overview of the polarized sky as seen by Planck HFI at 353 GHz, which is the most sensitive Planck channel for dust polarization. We construct and analyse maps of dust polarization fraction and polarization angle at 1° resolution, taking into account noise bias and possible systematic effects. The sensitivity of the Planck H…
Planck intermediate results. XXII. Frequency dependence of thermal emission from Galactic dust in intensity and polarization
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +177 more
Planck has mapped the intensity and polarization of the sky at microwave frequencies with unprecedented sensitivity. We use these data to characterize the frequency dependence of dust emission. We make use of the Planck 353 GHz I, Q, and U Stokes maps as dust templates, and cross-correlate them with the Planck and WMAP data at 12 frequencies from …
XMM-Newton and Chandra cross-calibration using HIFLUGCS galaxy clusters . Systematic temperature differences and cosmological impact
Lovisari, L.; David, L.; Reiprich, T. H. +2 more
Context. Robust X-ray temperature measurements of the intracluster medium (ICM) of galaxy clusters require an accurate energy-dependent effective area calibration. Since the hot gas X-ray emission of galaxy clusters does not vary on relevant timescales, they are excellent cross-calibration targets. Moreover, cosmological constraints from clusters …
Planck intermediate results. XX. Comparison of polarized thermal emission from Galactic dust with simulations of MHD turbulence
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +186 more
Polarized emission observed by Planck HFI at 353 GHz towards a sample of nearby fields is presented, focusing on the statistics of polarization fractions p and angles ψ. The polarization fractions and column densities in these nearby fields are representative of the range of values obtained over the whole sky. We find that: (i) the largest polariz…
Planck intermediate results. XXIV. Constraints on variations in fundamental constants
Kneissl, R.; Miville-Deschênes, M. -A.; Bernard, J. -P. +167 more
Any variation in the fundamental physical constants, more particularly in the fine structure constant, α, or in the mass of the electron, me, affects the recombination history of the Universe and cause an imprint on the cosmic microwave background angular power spectra. We show that the Planck data allow one to improve the constraint on…
Planck's dusty GEMS: The brightest gravitationally lensed galaxies discovered with the Planck all-sky survey
Kneissl, R.; Altieri, B.; Le Floc'h, E. +30 more
We present an analysis of CO spectroscopy and infrared-to-millimetre dust photometry of 11 exceptionally bright far-infrared (FIR) and sub-mm sources discovered through a combination of the Planck all-sky survey and follow-up Herschel-SPIRE imaging - "Planck's Dusty Gravitationally Enhanced subMillimetre Sources". Each source has a secure spectros…
Molecular clouds have power-law probability distribution functions
Alves, João; Lada, Charles J.; Lombardi, Marco
In this Letter we investigate the shape of the probability distribution of column densities (PDF) in molecular clouds. Through the use of low-noise, extinction-calibrated Herschel/Planck emission data for eight molecular clouds, we demonstrate that, contrary to common belief, the PDFs of molecular clouds are not described well by log-normal functi…
Planck intermediate results. XXIII. Galactic plane emission components derived from Planck with ancillary data
Kneissl, R.; Miville-Deschênes, M. -A.; Boulanger, F. +189 more
Planck data when combined with ancillary data provide a unique opportunity to separate the diffuse emission components of the inner Galaxy. The purpose of the paper is to elucidate the morphology of the various emission components in the strong star-formation region lying inside the solar radius and to clarify the relationship between the various …
Planck 2013 results. XXXII. The updated Planck catalogue of Sunyaev-Zeldovich sources
Böhringer, H.; Kneissl, R.; Dahle, H. +275 more
We update the all-sky Planck catalogue of 1227 clusters and cluster candidates (PSZ1) published in March 2013, derived from detections of the Sunyaev-Zeldovich (SZ) effect using the first 15.5 months of Planck satellite observations. As an addendum, we deliver an updated version of the PSZ1 catalogue, reporting the further confirmation of 86 Planc…