Search Publications
XMM-Newton 13H deep field - I. X-ray sources
McHardy, I.; Page, M. J.; Seymour, N. +10 more
We present the results of a deep X-ray survey conducted with XMM-Newton, centred on the UK ROSAT13H deep field area. This region covers 0.18 deg2, and is the first of the two areas covered with XMM-Newton as part of an extensive multiwavelength survey designed to study the nature and evolution of the faint X-ray source popula…
CLASS B2108+213: a new wide-separation gravitational lens system
Pearson, T. J.; McKean, J. P.; Treu, T. +15 more
We present observations of CLASS B2108+213, the widest separation gravitational lens system discovered by the Cosmic Lens All-Sky Survey. Radio imaging using the VLA at 8.46 GHz and MERLIN at 5 GHz shows two compact components separated by 4.56 arcsec with a faint third component in between which we believe is emission from a lensing galaxy. 5-GHz…
An XMM-Newton observation of Abell 2597
Fabian, A. C.; Morris, R. Glenn
We report on a 120-ks XMM-Newton observation of the galaxy cluster Abell 2597 (A2597). Results from both the European Photon Imaging Camera (EPIC) and the Reflection Grating Spectrometer (RGS) are presented. From EPIC we obtain radial profiles of temperature, density and abundance, and use these to derive cooling time and entropy. We illustrate co…
Final analysis of ELAIS 15-µm observations: method, reduction and catalogue
Aussel, H.; Pozzi, F.; Franceschini, A. +15 more
We present the final analysis of the European Large Area Infrared Space Observatory (ISO) Survey (ELAIS) 15-µm observations, carried out with the ISO Camera (ISOCAM) instrument on board the ISO.
The data-reduction method, known as the Lari Method, is based on a mathematical model of the behaviour of the detector and was specifically des…Infrared mergers and infrared quasi-stellar objects with galactic winds - III. Mrk 231: an exploding young quasi-stellar object with composite outflow/broad absorption lines (and multiple expanding superbubbles)
Zheng, W.; Terlevich, R.; Lípari, S. +3 more
We present a study of outflow (OF) and broad absorption line (BAL) systems in Mrk 231, and in similar infrared (IR) quasi-stellar objects (QSOs). This study is based mainly on one-dimensional and two-dimensional spectroscopy (obtained at La Palma/William Herschel Telescope, Hubble Space Telescope, International Ultraviolet Explorer, European South…
Discovery and study of the accreting pulsar 2RXP J130159.6-635806
Revnivtsev, M.; Lutovinov, A.; Chernyakova, M. +1 more
We report on analysis of the poorly studied source 2RXP J130159.6-635806 at different epochs with ASCA, BeppoSAX, XMM-Newton and INTEGRAL. The source shows coherent X-ray pulsations at a period ~700 s with an average spin-up rate of about . A broad-band (1-60 keV) spectral analysis of 2RXP J130159.6-635806 based on almost simultaneous XMM-Newton a…
Periodic variability during the X-ray decline of 4U 1636-53
Charles, P. A.; Bird, A. J.; Cornelisse, R. +2 more
We report the onset of a large amplitude, statistically significant periodicity (~46 d) in the Rossi X-ray Timing Explorer/All Sky Monitor (RXTE/ASM) data of the prototype X-ray burster 4U 1636-53, the X-ray flux of which has been gradually declining over the last 4 yr. This behaviour is remarkably similar to that observed in the neutron star low …
From young massive star cluster to old globular: the LV-σ0 relationship as a diagnostic tool
de Grijs, Richard; Tadhunter, Clive N.; Wilkinson, Mark I.
We present a new analysis of the properties of the young massive star clusters (YMCs) forming profusely in intense starburst environments, which demonstrates that these objects are plausible progenitors of the old globular clusters (GCs) seen abundantly in the Local Group. The method is based on the tight relationship for old GCs between their V-b…
The fingerprint of binary intermediate-mass black holes in globular clusters: suprathermal stars and angular momentum alignment
Possenti, A.; Mapelli, M.; Sigurdsson, S. +1 more
We explore the signatures that a binary intermediate-mass black hole (IMBH) imprints on the velocity and on the angular momentum of globular cluster (GC) stars. Simulating three-body encounters between a star and a binary IMBH, we find that the binary IMBH generates a family of a few hundred stars (~100-300) which remain bound to the GC and have v…
X-rays from the Type II quasar in the hyperluminous infrared galaxy IRAS F15307+3252*
Iwasawa, K.; Fabian, A. C.; Crawford, C. S. +1 more
We report the detection of X-ray emission from the hyperluminous infrared galaxy IRAS F15307 + 3252 at z= 0.93 and its properties obtained from XMM-Newton observations. Although the X-ray emission is very faint and the data are noisy, a prominent line-like feature in the observed 3-4 keV range is inferred from both photometric and spectroscopic te…