Search Publications
Detection of the first infra-red quasi-periodic oscillation in a black hole X-ray binary
van der Klis, M.; Casella, P.; Maccarone, T. +5 more
We present the analysis of fast variability of Very Large Telescope/ISAAC (Infrared Spectrometer And Array Camera) (infra-red), XMM-Newton/OM (optical) and EPIC-pn (X-ray), and RXTE/PCA (X-ray) observations of the black hole X-ray binary GX 339-4 in a rising hard state of its outburst in 2010. We report the first detection of a quasi-periodic osci…
Testing quasar unification: radiative transfer in clumpy winds
Knigge, C.; Long, K. S.; Sim, S. A. +3 more
Various unification schemes interpret the complex phenomenology of quasars and luminous active galactic nuclei (AGN) in terms of a simple picture involving a central black hole, an accretion disc and an associated outflow. Here, we continue our tests of this paradigm by comparing quasar spectra to synthetic spectra of biconical disc wind models, p…
A Mature Galaxy Cluster at z=1.58 around the Radio Galaxy 7C1753+6311
Stern, D.; Conselice, C. J.; Brodwin, M. +9 more
We report on the discovery of a z = 1.58 mature cluster around the high-redshift radio galaxy 7C 1753+6311, first identified in the Clusters Around Radio-loud active galactic nuclei survey. Two-thirds of the excess galaxies within the central 1 Mpc lie on a red sequence with a color that is consistent with an average formation redshift of zf<…
SPIDERS: the spectroscopic follow-up of X-ray selected clusters of galaxies in SDSS-IV
Zhang, Y. -Y.; Finoguenov, A.; Kneib, J. -P. +17 more
SPIDERS (The SPectroscopic IDentification of eROSITA Sources) is a programme dedicated to the homogeneous and complete spectroscopic follow-up of X-ray active galactic nuclei and galaxy clusters over a large area (∼7500 deg2) of the extragalactic sky. SPIDERS is part of the Sloan Digital Sky Survey (SDSS)-IV project, together with the E…
Short-term X-ray spectral variability of the quasar PDS 456 observed in a low-flux state
Tombesi, F.; Reeves, J. N.; Braito, V. +4 more
We present a detailed analysis of a recent, 2013 Suzaku campaign on the nearby (z = 0.184) luminous (Lbol ∼ 1047 erg s-1) quasar PDS 456. This consisted of three observations, covering a total duration of ∼1 Ms and a net exposure of 455 ks. During these observations, the X-ray flux was unusually low, suppressed by …
Europa's far ultraviolet oxygen aurora from a comprehensive set of HST observations
Saur, Joachim; Roth, Lorenz; Feldman, Paul D. +6 more
We analyze a large set of far ultraviolet oxygen aurora images of Europa's atmosphere taken by Hubble's Space Telescope Imaging Spectrograph (HST/STIS) in 1999 and on 19 occasions between 2012 and 2015. We find that both brightness and aurora morphology undergo systematic variations correlated to the periodically changing plasma environment. The t…
The 2012 July 23 Backside Eruption: An Extreme Energetic Particle Event?
Gopalswamy, N.; Yashiro, S.; Mäkelä, P. +3 more
The backside coronal mass ejection (CME) of 2012 July 23 had a short Sun-to-Earth shock transit time (18.5 hr). The associated solar energetic particle (SEP) event had a >10 MeV proton flux peaking at ∼5000 pfu, and the energetic storm particle event was an order of magnitude larger, making it the most intense event in the space era at these en…
Planck 2015 results. V. LFI calibration
Bernard, J. -P.; Planck Collaboration; Ade, P. A. R. +206 more
We present a description of the pipeline used to calibrate the Planck Low Frequency Instrument (LFI) timelines into thermodynamic temperatures for the Planck 2015 data release, covering four years of uninterrupted operations. As in the 2013 data release, our calibrator is provided by the spin-synchronous modulation of the cosmic microwave backgrou…
Exploring the mass assembly of the early-type disc galaxy NGC 3115 with MUSE
Krajnović, D.; Guérou, A.; Emsellem, E. +3 more
We present MUSE integral field spectroscopic data of the S0 galaxy NGC 3115 obtained during the instrument commissioning at the ESO Very Large Telescope (VLT). We analyse the galaxy stellar kinematics and stellar populations and present two-dimensional maps of their associated quantities. We thus illustrate the capacity of MUSE to map extra-galact…
Mars Express 10 years at Mars: Observations by the Mars Express Radio Science Experiment (MaRS)
Pätzold, M.; Hahn, M.; Rosenblatt, P. +17 more
The Mars Express spacecraft is operating in Mars orbit since early 2004. The Mars Express Radio Science Experiment (MaRS) employs the spacecraft and ground station radio systems (i) to conduct radio occultations of the atmosphere and ionosphere to obtain vertical profiles of temperature, pressure, neutral number densities and electron density, (ii…