438 citations · 4.6k across the 51 of their papers we have counts for
8 papers · 1 filter
Arithmetic with X-ray images of galaxy clusters: effective equation of state for small-scale perturbations in the ICM
E. Churazov, P. Arevalo, W. Forman +4
We discuss a novel technique of manipulating X-ray images of galaxy clusters to reveal the nature of small-scale density/temperature perturbations in the intra cluster medium (ICM)…
The nature of the unresolved extragalactic soft CXB
N. Cappelluti, P. Ranalli, M. Roncarelli +11
In this paper we investigate the power spectrum of the unresolved 0.5-2 keV CXB with deep Chandra 4 Ms observations in the CDFS. We measured a signal which, on scales >30", is sign…
A Mexican Hat with holes: calculating low resolution power spectra from data with gaps
P. Arevalo, E. Churazov, I. Zhuravleva +2
A simple method for calculating a low-resolution power spectrum from data with gaps is described. The method is a modification of the -variance method previously described by St…
The `harder when brighter' X-ray behaviour of the low luminosity active galactic nucleus NGC 7213
D. Emmanoulopoulos, I. E. Papadakis, I. M. McHardy +3
We present the first robust evidence of an anti-correlation between the X-ray photon index, Γ, and the X-ray luminosity in a single low luminosity active galactic nuclei (LLAGN), N…
Optical and Near-IR long-term monitoring of NGC3783 and MR2251-178: evidence for variable near-IR emission from thin accretion discs
P. Lira, P. Arevalo, P. Uttley +2
We present long term near-IR light curves for two nearby AGN: NGC3783 and MR2251-178. The near-IR data are complemented with optical photometry obtained over the same period of tim…
An XMM-Newton view of the `bare' nucleus of Fairall 9
D. Emmanoulopoulos, I. E. Papadakis, I. M. McHardy +3
We present the spectral results from a 130 ks observation, obtained from the X-ray Multi-Mirror Mission-Newton (XMM-Newton) observatory, of the type I Seyfert galaxy Fairall 9. An…