Search Publications
An XMM-Newton survey of broad iron lines in Seyfert galaxies
Nandra, K.; Reeves, J. N.; George, I. M. +1 more
We present an analysis of the X-ray spectra of a sample of 37 observations of 26 Seyfert galaxies observed by XMM-Newton in order to characterize their iron Kα emission. All objects show evidence for iron line emission in the 6-7 keV band. A narrow `core' at 6.4 keV is seen almost universally in the spectra, and we model this using a neutral Compt…
On the origin of soft X-rays in obscured AGN: answers from high-resolution spectroscopy with XMM-Newton
Guainazzi, Matteo; Bianchi, Stefano
We present results of a high-resolution soft X-ray (0.2-2 keV) spectroscopic study of a sample of 69 nearby obscured active galactic nuclei (AGNs) observed with the reflection grating spectrometer (RGS) onboard XMM-Newton. This is the largest sample ever studied with this technique so far. The main conclusions of our study can be summarized as fol…
The XMM-LSS survey: the Class 1 cluster sample over the initial 5 deg2 and its cosmological modelling
Maccagni, D.; Chiappetti, L.; Altieri, B. +30 more
We present a sample of 29 galaxy clusters from the XMM-LSS survey over an area of some 5 deg2 out to a redshift of z= 1.05. The sample clusters, which represent about half of the X-ray clusters identified in the region, follow well-defined X-ray selection criteria and are all spectroscopically confirmed. For all clusters, we provide X-r…
Magnetic hydrogen atmosphere models and the neutron star RX J1856.5-3754
Ho, Wynn C. G.; Kaplan, David L.; Chang, Philip +2 more
RX J1856.5-3754 is one of the brightest nearby isolated neutron stars (INSs), and considerable observational resources have been devoted to it. However, current models are unable to satisfactorily explain the data. We show that our latest models of a thin, magnetic, partially ionized hydrogen atmosphere on top of a condensed surface can fit the en…
Discovery of multiple Lorentzian components in the X-ray timing properties of the Narrow Line Seyfert 1 Ark 564
Papadakis, I. E.; Page, M. J.; Uttley, P. +4 more
We present a power spectral analysis of a 100-ks XMM-Newton observation of the Narrow Line Seyfert 1 galaxy Ark 564. When combined with earlier RXTE and ASCA observations, these data produce a power spectrum covering seven decades of frequency which is well described by a power law with two very clear breaks. This shape is unlike the power spectra…
The escape of Lyman photons from a young starburst: the case of Haro11†
Hayes, Matthew; Östlin, Göran; Leitherer, Claus +5 more
Lyman α (Lyα) is one of the dominant tools used to probe the star-forming galaxy population at high redshift (z). However, astrophysical interpretations of data drawn from Lyα alone hinge on the Lyα escape fraction which, due to the complex radiative transport, may vary greatly. Here, we map the Lyα emission from the local luminous blue compact ga…
Modelling mid-Z element atmospheres for strongly magnetized neutron stars
Mori, Kaya; Ho, Wynn C. G.
We construct models for strongly magnetized neutron star atmospheres composed of mid-Z elements (carbon, oxygen and neon) with magnetic fields B = 1012-1013 G and effective temperatures Teff = (1 - 5) × 106 K; this is done by first addressing the physics relevant to strongly magnetized plasmas and calcul…
Exciting the magnetosphere of the magnetar CXOU J164710.2-455216 in Westerlund 1
Muno, M. P.; Pooley, D.; Gaensler, B. M. +4 more
We describe XMM-Newton observations taken 4.3 d prior to and 1.5 d subsequent to two remarkable events that were detected with Swift on 2006 September 21 from the candidate magnetar CXOU J164710.2-455216: (i) a 20-ms burst with an energy of 1037 erg (15-150 keV), and (ii) a rapid spin-down (glitch) with Δ P/P ~ -10-4. We find…
An absorption origin for the soft excess in Seyfert 1 active galactic nuclei
Done, Chris; Gierliński, Marek; Middleton, Matthew
The soft excess seen in the X-ray spectra of many active galactic nuclei (AGN) can be well modelled by reflection from a partially ionized accretion disc. However, this often requires extreme parameters, both in terms of the underlying space-time and the reflection geometry, and requires that the disc is far from hydrostatic equilibrium. An altern…
The XMM-Large Scale Structure catalogue: X-ray sources and associated optical data. Version I
Maccagni, D.; Chiappetti, L.; Altieri, B. +34 more
Following the presentation of the XMM-Large Scale Structure (XMM-LSS) survey X-ray source detection package by Pacaud et al., we provide the source lists for the first surveyed 5.5deg2. The catalogues pertain to the [0.5-2] and [2-10] keV bands and contain in total 3385 point-like or extended sources above a detection likelihood of 15 i…