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9 papers · 2 filters
The missing link: a low mass X-ray binary in M31 seen as an ultraluminous X-ray source
Matthew J. Middleton, Andrew D. Sutton, Timothy P. Roberts +2
A new, transient ultraluminous X-ray source (ULX) was recently discovered by Chandra in M31 with a luminosity at ~ 5 x 10^39 erg/s. Here we analyse a series of five subsequent XMM-…
A Combined Optical and X-ray Study of Unobscured Type 1 AGN. I. Optical Spectra and SED Modeling
C. Jin, M. Ward, C. Done +1
We present modeling and interpretation of the continuum and emission lines for a sample of 51 unobscured Type 1 active galactic nuclei (AGN). All of these AGNs have high quality sp…
Modelling variability in black hole binaries: linking simulations to observations
Adam Ingram, Chris Done
Black hole accretion flows show rapid X-ray variability. The Power Spectral Density (PSD) of this is typically fit by a phenomenological model of multiple Lorentzians for both the…
Spectral and Timing Studies of Cyg X-1 in the Low/Hard State with Suzaku
Shunsuke Torii, Shin'ya Yamada, Kazuo Makishima +6
From 2005 to 2009, 25 observations of Cyg X-1 were performed with Suzaku, achieving a total exposure of 446 ks. In all observations, the source was found in the low/hard state, whi…
Intrinsic disc emission and the Soft X-ray Excess in AGN
Chris Done, Shane Davis, Chichuan Jin +2
(Abridged) Narrow Line Seyfert 1 (NLS1) galaxies have low mass black holes and mass accretion rates close to (or exceeding) Eddington, so a standard blackbody accretion disc should…
Evidence for a change in the X-ray radiation mechanism in the hard state of Galactic black holes
M. A. Sobolewska, I. E. Papadakis, C. Done +1
We present results on spectral variability of two Galactic black hole X-ray binaries, GRO J1655-40 and GX 339-4, in the hard state. We confirm a transition in behaviour of the phot…
Modelling the high mass accretion rate spectra of GX 339-4: Black hole spin from reflection?
Mari Kolehmainen, Chris Done, Maria Diaz Trigo
We extract all the XMM-Newton EPIC pn burst mode spectra of GX 339-4, together with simultaneous/contemporaneous RXTE data. These include three disc dominated and two soft intermed…
Unlocking the nature of ultraluminous X-ray sources using their X-ray spectra
Jeanette C. Gladstone, Timothy P. Roberts, Chris Done
We explore the nature of ultraluminous X-ray sources through detailed investigations of their spectral shape using some of the highest quality data available in the XMM-Newton publ…
Comparing Spectral Models for ULXs with NGC 4517 ULX1
D. J. Walton, J. C. Gladstone, T. P. Roberts +4
We present the previously unanalysed high quality XMM-Newton spectrum of an ultraluminous X-ray source candidate in NGC 4517. As with other high quality ULX spectra, a downturn in…