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Accretion onto nearby supermassive black holes: Chandra constraints on the dominant cluster galaxy NGC 6166
T. Di Matteo, R. M. Johnstone, S. W. Allen +1
Chandra observations of low-luminosity supermassive black holes in nearby elliptical galaxies provide tight limits on both their nuclear luminosities and on their Bondi accretion r…
XTE J1118+480: Clues on the Nature of the Accretion Flow from the Optical Variability
A. Merloni, T. Di Matteo, A. C. Fabian
We show how the simultaneous presence of a strong quasi periodic oscillation (QPO) of period of about 10 seconds in the optical and X-ray lightcurves of the X-ray transient XTE J11…
Hydrodynamic Simulation of the Cosmological X-ray Background
Rupert A. C. Croft, Tiziana Di Matteo, Romeel Dav'e +4
(Abridged) We use a hydrodynamic simulation of a LambdaCDM model to predict the extragalactic X-ray background (XRB), focussing on emission from the intergalactic medium (IGM). We…
Relativistic Iron Emission and Disk Reflection in Galactic Microquasar XTE J1748-288
J. M. Miller, D. W. Fox, T. DiMatteo +5
We report evidence for an Fe K-alpha fluorescence line feature and disk reflection in the Very High, High, and Low State X-ray spectra of the galactic microquasar XTE J1748-288 dur…
Magnetic flares and the optical variability of the X-ray transient XTE J1118+480
A. Merloni, T. Di Matteo, A. C. Fabian
The simultaneous presence of a strong quasi periodic oscillation of period of about 10 seconds in the optical and X-ray lightcurves of the X-ray transient XTE J1118+480 suggests th…
Limits on the accretion rates onto massive black holes in nearby galaxies
T. Di Matteo, C. L. Carilli, A. C. Fabian
The radio emission from supermassive black holes in nearby early-type galaxies can be used to test possible explanations for their low luminosities. We calculate the expected contr…
Synchrotron Emission from Hot Accretion Flows and the Cosmic Microwave Background Anisotropy
Rosalba Perna, Tiziana Di Matteo
Current estimates of number counts of radio sources in the frequency range where the most sensitive Cosmic Microwave Background (CMB) experiments are carried out significantly unde…
X-ray Images of Hot Accretion Flows
Feryal Ozel, Tiziana Di Matteo
We consider the X-ray emission due to bremsstrahlung processes from hot, low radiative-efficiency accretion flows around supermassive and galactic black holes. We calculate surface…