Search Publications
The XMM Large-Scale Structure survey: a well-controlled X-ray cluster sample over the D1 CFHTLS area
Maccagni, D.; Chiappetti, L.; Altieri, B. +24 more
We present the XMM Large-Scale Structure Survey (XMM-LSS) cluster catalogue corresponding to the Canada-France-Hawaii Telescope Legacy Survey D1 area. The list contains 13 spectroscopically confirmed, X-ray selected galaxy clusters over 0.8deg2 to a redshift of unity and so constitutes the highest density sample of clusters to date. Clu…
Enrichment in the Centaurus cluster of galaxies
Fabian, A. C.; Sanders, J. S.
We perform a detailed spatially resolved, spectroscopic, analysis of the core of the Centaurus cluster of galaxies using a deep Chandra X-ray observation and XMM-Newton data. The Centaurus cluster core has particularly high metallicity, up to twice the solar values, and we measure the abundances of Fe, O, Ne, Mg, Si, S, Ar, Ca and Ni. We map the d…
Confirming the high velocity outflow in PG1211+143
Page, K. L.; Pounds, K. A.
An XMM-Newton observation of the bright quasi-stellar object PG1211+143 was previously reported to show evidence for a massive, energetic outflow, with an outflow velocity of v ~ 0.1c based on the identification of blueshifted absorption lines detected in both EPIC and Reflection Grating Spectrometer (RGS) spectra. Subsequently, an order of magnit…
The nature of the HE0450-2958 system
Robinson, Andrew; Storchi-Bergmann, Thaisa; Merritt, David +3 more
Magain et al. argued that the host galaxy of the quasar in HE0450-2958 is substantially underluminous given the quasar brightness. Using kinematical information from the spectra of the quasar and the companion galaxy, an ultraluminous infrared galaxy, we test the hypothesis that the black hole powering the quasar was ejected from the companion gal…
Shapley Optical Survey - II. The effect of environment on the colour-magnitude relation and galaxy colours
Mercurio, A.; Capaccioli, M.; Gargiulo, A. +5 more
We present an analysis of the effects of environment on the photometric properties of galaxies in the core of the Shapley supercluster at z = 0.05, one of the most massive structures in the local universe. The Shapley Optical Survey (SOS) comprises archive Wide Field Imager (WFI) optical imaging of a 2.0deg2 region containing the rich c…
A fossil galaxy cluster: an X-ray and optical study of RX J1416.4+2315
Ponman, Trevor J.; Khosroshahi, Habib G.; Maughan, Ben J. +1 more
We present a detailed X-ray and optical study of a distant fossil system RX J1416.4+2315(z ~ 0.137), combining Chandra and XMM-Newton observations, optical photometry and spectroscopy. X-ray emitting hot gas imaged by both the Chandra and XMM-Newton shows a globally relaxed spatial distribution, supporting the idea that fossil groups are old galax…
The planetary nebula population of the Sagittarius dwarf spheroidal galaxy
Minniti, D.; Walsh, J. R.; van Hoof, P. A. M. +3 more
The identification of two new planetary nebulae (PNe) in the Sagittarius dwarf spheroidal galaxy (Sgr) is presented. This brings the total number to four. Both new PNe were previously classified as Galactic objects. The first, StWr 2-21, belongs to the main body of Sgr, from its velocity and location. The second, the halo PN BoBn1, has a location,…
XMM-LSS discovery of a z = 1.22 galaxy cluster
Altieri, B.; Valtchanov, I.; Surace, J. A. +11 more
We present details of the discovery of XLSS J022303.0-043622, a z = 1.2 cluster of galaxies. This cluster was identified from its X-ray properties and selected as a z > 1 candidate from its optical/near-infrared (IR) characteristics in the XMM Large-Scale Structure Survey (XMM-LSS). It is the most distant system discovered in the survey to date…
The X-ray properties of young radio-loud AGN
Vink, Jacco; Snellen, Ignas; Mack, Karl-Heinz +1 more
We present XMM-Newton observations of a complete sample of five archetypal young radio-loud active galactic nucleus (AGN), also known as Compact Symmetric Objects (CSO) or Gigahertz Peaked Spectrum (GPS) sources. They are among the brightest and best studied GPS/CSO sources in the sky, with radio powers in the range L5GHz= 1043-44<…
A variable Quasi-Periodic Oscillation in M82 X-1. Timing and spectral analysis of XMM-Newton and RossiXTE observations
Belloni, T.; Ranalli, P.; Casella, P. +2 more
We report results from a spectral and timing analysis of M82 X-1, one of the brightest known ultraluminous X-ray sources. Data from a new 105-ks XMM-Newton observation of M82 X-1, performed in 2004 April, and of archival RossiXTE observations are presented. A very soft thermal component is present in the XMM spectrum. Although it is not possible t…