Search Publications
Gaia Data Release 1. Pre-processing and source list creation
Mora, A.; Boudreault, S.; Jordan, S. +104 more
Context. The first data release from the Gaia mission contains accurate positions and magnitudes for more than a billion sources, and proper motions and parallaxes for the majority of the 2.5 million Hipparcos and Tycho-2 stars.
Aims: We describe three essential elements of the initial data treatment leading to this catalogue: the image analy…
The Lyman continuum escape fraction of galaxies at z = 3.3 in the VUDS-LBC/COSMOS field
Maccagni, D.; Cimatti, A.; Ilbert, O. +52 more
Context. The ionizing Lyman continuum flux escaping from high-redshift galaxies into the intergalactic medium is a fundamental quantity to understand the physical processes involved in the reionization epoch. However, from an observational point of view, direct detections of HI ionizing photons at high redshifts are feasible for galaxies mainly in…
MUSE crowded field 3D spectroscopy of over 12 000 stars in the globular cluster NGC 6397. I. The first comprehensive HRD of a globular cluster
Bacon, Roland; Brinchmann, Jarle; Weilbacher, Peter M. +8 more
Aims: We demonstrate the high multiplex advantage of crowded field 3D spectroscopy with the new integral field spectrograph MUSE by means of a spectroscopic analysis of more than 12 000 individual stars in the globular cluster NGC 6397.
Methods: The stars are deblended with a point spread function fitting technique, using a photometric r…
The XXL Survey. XIII. Baryon content of the bright cluster sample
Smith, G. P.; Chiappetti, L.; Paltani, S. +20 more
Traditionally, galaxy clusters have been expected to retain all the material accreted since their formation epoch. For this reason, their matter content should be representative of the Universe as a whole, and thus their baryon fraction should be close to the Universal baryon fraction Ωb/ Ωm. We make use of the sample of the …
Three-dimensional direct simulation Monte-Carlo modeling of the coma of comet 67P/Churyumov-Gerasimenko observed by the VIRTIS and ROSINA instruments on board Rosetta
Altwegg, K.; Huang, Z.; Erard, S. +26 more
Context. Since its rendezvous with comet 67P/Churyumov-Gerasimenko (67P), the Rosetta spacecraft has provided invaluable information contributing to our understanding of the cometary environment. On board, the VIRTIS and ROSINA instruments can both measure gas parameters in the rarefied cometary atmosphere, the so-called coma, and provide compleme…
Wolf-Rayet stars in the Small Magellanic Cloud. II. Analysis of the binaries
Sander, A.; Hamann, W. -R.; Oskinova, L. M. +7 more
Context. Massive Wolf-Rayet (WR) stars are evolved massive stars (MI ≳ 20 M⊙) characterized by strong mass-loss. Hypothetically, they can form either as single stars or as mass donors in close binaries. About 40% of all known WR stars are confirmed binaries, raising the question as to the impact of binarity on the WR populati…
Characterizing filaments in regions of high-mass star formation: High-resolution submilimeter imaging of the massive star-forming complex NGC 6334 with ArTéMiS
Hill, T.; Rodriguez, L.; Roussel, H. +28 more
Context. Herschel observations of nearby molecular clouds suggest that interstellar filaments and prestellar cores represent two fundamental steps in the star formation process. The observations support a picture of low-mass star formation according to which filaments of ~0.1 pc width form first in the cold interstellar medium, probably as a resul…
Planck intermediate results. XLIX. Parity-violation constraints from polarization data
Miville-Deschênes, M. -A.; Bernard, J. -P.; Planck Collaboration +148 more
Parity-violating extensions of the standard electromagnetic theory cause in vacuo rotation of the plane of polarization of propagating photons. This effect, also known as cosmic birefringence, has an impact on the cosmic microwave background (CMB) anisotropy angular power spectra, producing non-vanishing T-B and E-B correlations that are otherwise…
Spectro-photometric distances to stars: A general purpose Bayesian approach
Schneider, Donald P.; Steinmetz, Matthias; Girardi, Léo +16 more
Context. Determining distances to individual field stars is a necessary step towards mapping Galactic structure and determining spatial variations in the chemo-dynamical properties of stellar populations in the Milky Way.
Aims: In order to provide stellar distance estimates for various spectroscopic surveys, we have developed a code that esti…
Planck 2015 results. II. Low Frequency Instrument data processings
Bernard, J. -P.; Planck Collaboration; Ade, P. A. R. +214 more
We present an updated description of the Planck Low Frequency Instrument (LFI) data processing pipeline, associated with the 2015 data release. We point out the places where our results and methods have remained unchanged since the 2013 paper and we highlight the changes made for the 2015 release, describing the products (especially timelines) and…