Search Publications
Broad iron L line and X-ray reverberation in 1H0707-495
Ponti, G.; Fabian, A. C.; Miller, J. M. +5 more
A detailed analysis of a long XMM-Newton observation of the narrow-line type 1 Seyfert galaxy 1H0707-495 is presented, including spectral fitting, spectral variability and timing studies. The two main features in the spectrum are the drop at ~7keV and a complex excess below 1keV. These are well described by two broad, K and L, iron lines. Alternat…
A Bayesian test for periodic signals in red noise
Vaughan, S.
Many astrophysical sources, especially compact accreting sources, show strong, random brightness fluctuations with broad power spectra in addition to periodic or quasi-periodic oscillations (QPOs) that have narrower spectra. The random nature of the dominant source of variance greatly complicates the process of searching for possible weak periodic…
Black hole accretion discs in the canonical low-hard state
Fabian, A. C.; Miller, J. M.; Reis, R. C.
Stellar mass black holes in the low-hard state may hold clues to jet formation and basic accretion disc physics, but the nature of the accretion flow remains uncertain. A standard thin disc can extend close to the innermost stable circular orbit, but the inner disc may evaporate when the mass accretion rate is reduced. Blackbody-like continuum emi…
X-ray groups and clusters of galaxies in the Subaru-XMM Deep Field
Finoguenov, A.; Smolčić, V.; McLure, R. J. +20 more
We present the results of a search for galaxy clusters in the Subaru-XMM Deep Field (SXDF). We reach a depth for a total cluster flux in the 0.5-2 keV band of 2 × 10-15 erg cm-2 s-1 over one of the widest XMM-Newton contiguous raster surveys, covering an area of 1.3deg2. Cluster candidates are identified…
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…
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…
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…
X-ray reverberation in 1H0707-495 revisited
Turner, T. J.; Reeves, J. N.; Braito, V. +1 more
The narrow-line Seyfert1 galaxy 1H0707-495 has previously been identified as showing time lags between flux variations in the soft-energy (0.3-1keV) and medium-energy (1-4keV) X-ray bands that oscillate between positive and negative values as a function of the frequency of the mode of variation. Here we measure and analyse the lags also between a …