Search Publications
A re-analysis of the iron line in the XMM-Newton data from the low/hard state in GX339-4
Done, Chris; Diaz Trigo, Maria
The detection of an extremely broad iron line in XMM-Newton MOS data from the low/hard state of the black hole binary GX339-4 is the only piece of evidence which unambiguously conflicts with the otherwise extremely successful truncated disc interpretation of this state. However, it also conflicts with some aspect of observational data for all othe…
Broad-line region physical conditions along the quasar eigenvector 1 sequence
Marziani, P.; Bachev, R.; Sulentic, J. W. +3 more
We compare broad emission-line profiles and estimate line ratios for all major emission lines between Lyα and Hβ in a sample of six quasars. The sources were chosen with two criteria in mind: the existence of high-quality optical and ultraviolet spectra and the possibility of sampling the spectroscopic diversity in the 4D eigenvector 1 (4DE1) cont…
Herschel-ATLAS: the far-infrared-radio correlation at z < 0.5
Rodighiero, G.; Ivison, R. J.; de Zotti, G. +45 more
We use data from the Herschel-ATLAS to investigate the evolution of the far-infrared-radio correlation over the redshift range 0 < z < 0.5. Using the total far-infrared luminosity of all >5σ sources in the Herschel-ATLAS Science Demonstration Field and cross-matching these data with radio data from the Faint Images of the Radio Sky at Twe…
The radio properties of a complete, X-ray selected sample of nearby, massive elliptical galaxies
Fabian, A. C.; Reynolds, C. S.; Gentile, G. +4 more
We investigate the radio properties of a complete sample of nearby, massive, X-ray bright elliptical and S0 galaxies. Our sample contains 18 galaxies with ROSAT All-Sky Survey X-ray fluxes FX,0.1-2.4keV > 3 × 10-12ergs-1cm-2, within a distance of 100Mpc. For these galaxies, we have completed (18/18) V…
3D models of radiatively driven colliding winds in massive O + O star binaries - III. Thermal X-ray emission
Pittard, J. M.; Parkin, E. R.
The X-ray emission from the wind-wind collision in short-period massive O + O star binaries is investigated. The emission is calculated from 3D hydrodynamical models which incorporate gravity, the driving of the winds, orbital motion of the stars and radiative cooling of the shocked plasma. Changes in the amount of stellar occultation and circumst…
Completing the puzzle of the 2004-2005 outburst in V0332+53: the brightening phase included
Tsygankov, S. S.; Lutovinov, A. A.; Serber, A. V.
Analysis of the data obtained with the RXTE observatory during a powerful outburst of the X-ray pulsar V0332+53 in 2004-2005 is presented. Observational data covering the outburst brightening phase are analysed in detail for the first time. A comparison of source parameters and their evolution during the brightening and fading phases shows no evid…
Detection of a magnetic field on HD108: clues to extreme magnetic braking and the Of?p phenomenon
Bouret, J. -C.; Martins, F.; Donati, J. -F. +5 more
We report the detection of a magnetic field on the Of?p star HD108. Spectropolarimetric observations conducted in 2007, 2008 and 2009, respectively, with NARVAL@Télescope Bernard Lyot (TBL) and Echelle SpectroPolarimetric Device for the Observation of Stars at Canada-France-Hawaii Telescope (ESPaDOnS@CFHT) reveal a clear Zeeman signature in the av…
Panoramic Hα and mid-infrared mapping of star formation in a z = 0.8 cluster
Shimasaku, Kazuhiro; Koyama, Yusei; Kodama, Tadayuki +4 more
We present the first wide-field Hα imaging survey around the distant cluster RXJ1716.4+6708 at z = 0.81 with a narrow-band filter on MOIRCS/Subaru, which reveals the star formation activities down to a star formation rate (SFR) of ~1Msolaryr-1 without extinction correction. Combining with a wide-field mid-infrared (MIR) imagi…
Feedback under the microscope-II. Heating, gas uplift and mixing in the nearest cluster core
Böhringer, H.; Simionescu, A.; Churazov, E. +11 more
Using a combination of deep (574 ks) Chandra data, XMM-Newton high-resolution spectra and optical Hα+[NII] images, we study the nature and spatial distribution of the multi-phase plasma in M87. Our results provide direct observational evidence of `radio-mode' active galactic nuclei (AGN) feedback in action, stripping the central galaxy of its lowe…
A direct limit on the turbulent velocity of the intracluster medium in the core of Abell 1835 from XMM-Newton
Fabian, A. C.; Sanders, J. S.; Smith, R. K. +1 more
We examine deep XMM-Newton Reflection Grating Spectrometer observations of the X-ray luminous galaxy cluster A1835. For the first time in a galaxy cluster, we place direct limits on turbulent broadening of the emission lines. This is possible because the coolest X-ray emitting gas in the cluster, which is responsible for the lines, occupies a smal…