Search Publications
Gaia Data Release 2. Processing the spectroscopic data
Smith, M.; Gosset, E.; Allende Prieto, C. +50 more
Context. The Gaia Data Release 2 (DR2) contains the first release of radial velocities complementing the kinematic data of a sample of about 7 million relatively bright, late-type stars.
Aims: This paper provides a detailed description of the Gaia spectroscopic data processing pipeline, and of the approach adopted to derive the radial velocit…
3D mapping of young stars in the solar neighbourhood with Gaia DR2
Brown, A. G. A.; Jardine, K.; de Zeeuw, P. T. +2 more
We study the three dimensional arrangement of young stars in the solar neighbourhood using the second release of the Gaia mission (Gaia DR2) and we provide a new, original view of the spatial configuration of the star-forming regions within 500 pc of the Sun. By smoothing the star distribution through a Gaussian filter, we construct three dimensio…
Accurately predicting the escape fraction of ionizing photons using rest-frame ultraviolet absorption lines
Dahle, H.; Rigby, J. R.; Sharon, K. +6 more
The fraction of ionizing photons that escape high-redshift galaxies sensitively determines whether galaxies reionized the early Universe. However, this escape fraction cannot be measured from high-redshift galaxies because the opacity of the intergalactic medium is large at high redshifts. Without methods to measure the escape fraction of high-red…
H.E.S.S. observations of RX J1713.7-3946 with improved angular and spectral resolution: Evidence for gamma-ray emission extending beyond the X-ray emitting shell
Klochkov, D.; Santangelo, A.; Quirrenbach, A. +254 more
Supernova remnants exhibit shock fronts (shells) that can accelerate charged particles up to very high energies. In the past decade, measurements of a handful of shell-type supernova remnants in very high-energy gamma rays have provided unique insights into the acceleration process. Among those objects, RX J1713.7-3946 (also known as G347.3-0.5) h…
Constraints from thermal Sunyaev-Zel'dovich cluster counts and power spectrum combined with CMB
Salvati, Laura; Douspis, Marian; Aghanim, Nabila
The thermal Sunyaev-Zel'dovich (tSZ) effect is one of the recent probes of cosmology and large-scale structures. We update constraints on cosmological parameters from galaxy clusters observed by the Planck satellite in a first attempt to combine cluster number counts and the power spectrum of hot gas; we used a new value of the optical depth and, …
The escape speed curve of the Galaxy obtained from Gaia DR2 implies a heavy Milky Way
Anders, F.; Chiappini, C.; Steinmetz, M. +6 more
We measure the escape speed curve of the Milky Way based on the analysis of the velocity distribution of 2850 counter-rotating halo stars from the Gaia Data Release 2. The distances were estimated through the StarHorse code, and only stars with distance errors smaller than 10% were used in the study. The escape speed curve is measured at Galactoce…
Evolution of protoplanetary disks from their taxonomy in scattered light: spirals, rings, cavities, and shadows
Ménard, F.; van der Plas, G.; Ginski, C. +11 more
Context. Dozens of protoplanetary disks have been imaged in scattered light during the last decade.
Aims: The variety of brightness, extension, and morphology from this census motivates a taxonomical study of protoplanetary disks in polarimetric light to constrain their evolution and establish the current framework of this type of observation…
DustPedia: Multiwavelength photometry and imagery of 875 nearby galaxies in 42 ultraviolet-microwave bands
Bianchi, S.; Fritz, J.; De Looze, I. +16 more
Aims: The DustPedia project is capitalising on the legacy of the Herschel Space Observatory, using cutting-edge modelling techniques to study dust in the 875 DustPedia galaxies - representing the vast majority of extended galaxies within 3000 km s-1 that were observed by Herschel. This work requires a database of multiwavelength im…
The 55 Cancri system reassessed
Moutou, C.; Ehrenreich, D.; Lovis, C. +9 more
Orbiting a bright, nearby star the 55 Cnc system offers a rare opportunity to study a multiplanet system that has a wide range of planetary masses and orbital distances. Using two decades of photometry and spectroscopy data, we have measured the rotation of the host star and its solar-like magnetic cycle. Accounting for this cycle in our velocimet…
The XXL Survey. XX. The 365 cluster catalogue
Chiappetti, L.; Altieri, B.; Valtchanov, I. +54 more
Context. In the currently debated context of using clusters of galaxies as cosmological probes, the need for well-defined cluster samples is critical.
Aims: The XXL Survey has been specifically designed to provide a well characterised sample of some 500 X-ray detected clusters suitable for cosmological studies. The main goal of present articl…