Search Publications
The Sloan Digital Sky Survey Quasar Catalog: Fourteenth data release
Green, Paul J.; Pâris, Isabelle; Petitjean, Patrick +38 more
We present the data release 14 Quasar catalog (DR14Q) from the extended Baryon Oscillation Spectroscopic Survey (eBOSS) of the Sloan Digital Sky Survey IV (SDSS-IV). This catalog includes all SDSS-IV/eBOSS objects that were spectroscopically targeted as quasar candidates and that are confirmed as quasars via a new automated procedure combined with…
The evolution of the X-ray afterglow emission of GW 170817/ GRB 170817A in XMM-Newton observations
Covino, S.; D'Avanzo, P.; Campana, S. +12 more
We report our observation of the short gamma-ray burst (GRB) GRB 170817A, associated to the binary neutron star merger gravitational wave (GW) event GW 170817, performed in the X-ray band with XMM-Newton 135 d after the event (on 29 December, 2017). We find evidence for a flattening of the X-ray light curve with respect to the previously observed …
Hubble PanCET: an extended upper atmosphere of neutral hydrogen around the warm Neptune GJ 3470b
Sanz-Forcada, J.; Ehrenreich, D.; Lecavelier des Etangs, A. +16 more
GJ 3470b is a warm Neptune transiting an M-dwarf star at the edge of the evaporation desert. It offers the possibility of investigating how low-mass, close-in exoplanets evolve under the irradiation from their host stars. We observed three transits of GJ 3470b in the Lyman-α line with the Hubble Space Telescope (HST) as part of the Panchromatic Co…
Testing warm Comptonization models for the origin of the soft X-ray excess in AGNs
Bianchi, S.; Cappi, M.; Petrucci, P. -O. +5 more
The X-ray spectra of many active galactic nuclei (AGNs) show a soft X-ray excess below 1-2 keV on top of the extrapolated high-energy power law. The origin of this component is uncertain. It could be a signature of relativistically blurred, ionized reflection or the high-energy tail of thermal Comptonization in a warm (kT 1 keV), optically thick (…
3D shape of Orion A from Gaia DR2
Meingast, Stefan; Alves, João; Bouy, Hervé +16 more
We use the Gaia DR2 distances of about 700 mid-infrared selected young stellar objects in the benchmark giant molecular cloud Orion A to infer its 3D shape and orientation. We find that Orion A is not the fairly straight filamentary cloud that we see in (2D) projection, but instead a cometary-like cloud oriented toward the Galactic plane, with two…
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…
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…
A deep X-ray view of the bare AGN Ark 120. IV. XMM-Newton and NuSTAR spectra dominated by two temperature (warm, hot) Comptonization processes
Harrison, F.; Stern, D.; Zhang, W. W. +16 more
Context. The physical characteristics of the material closest to supermassive black holes (SMBHs) are primarily studied through X-ray observations. However, the origins of the main X-ray components such as the soft X-ray excess, the Fe Kα line complex, and the hard X-ray excess are still hotly debated. This is particularly problematic for active g…
The XMM Cluster Outskirts Project (X-COP): Thermodynamic properties of the intracluster medium out to R200 in Abell 2319
Hurier, G.; Pointecouteau, E.; Molendi, S. +5 more
Aims: We present the joint analysis of the X-ray and Sunyaev-Zel'dovich (SZ) signals in Abell 2319, the galaxy cluster with the highest signal-to-noise ratio in SZ Planck maps and that has been surveyed within our XMM-Newton Cluster Outskirts Project (X-COP), a very large program which aims to grasp the physical condition in 12 local (z < …
The XXL Survey. XXV. Cosmological analysis of the C1 cluster number counts
Chiappetti, L.; Altieri, B.; Valtchanov, I. +26 more
Context. We present an estimation of cosmological parameters with clusters of galaxies.
Aims: We constrain the Ωm, σ8, and w parameters from a stand-alone sample of X-ray clusters detected in the 50 deg2 XMM-XXL survey with a well-defined selection function.
Methods: We analyse the redshift distribution o…