Search Publications
X-ray observations of the Large Magellanic Cloud pulsar PSR B0540-69 and its pulsar wind nebula
de Rosa, A.; Bassani, L.; Dean, A. J. +3 more
PSR B0540-69 is a young pulsar in the Large Magellanic Cloud that has similar properties with respect to the Crab Pulsar, and is embedded in a pulsar wind nebula (PWN). We have analysed the complete archival Rossi X-Ray Timing Explorer (RXTE) data set of observations of this source, together with new Swift/XRT (X-Ray Telescope) and International G…
Simulating anisotropic thermal conduction in supernova remnants - II. Implications for the interstellar medium
Howk, J. Christopher; Balsara, Dinshaw S.; Bendinelli, Anthony J. +2 more
We present a large number of 2.5D simulations of supernova remnants expanding into interstellar media having a range of densities, temperatures and magnetic field strengths. The simulations include equilibrium cooling and anisotropic, flux-limited thermal conduction along magnetic field lines. The volume of hot gas produced during the remnant's ev…
Swift captures the spectrally evolving prompt emission of GRB070616
Page, M. J.; Norris, J. P.; O'Brien, P. T. +14 more
The origins of gamma-ray burst (GRB) prompt emission are currently not well understood and in this context long, well-observed events are particularly important to study. We present the case of GRB070616, analysing the exceptionally long-duration multipeaked prompt emission, and later afterglow, captured by all the instruments on-board Swift and b…
The dynamical state of RX J1347.5-1145 from a combined strong lensing and X-ray analysis
Paolillo, M.; Sereno, M.; Miranda, M. +1 more
We perform a combined X-ray and strong lensing analysis of RX J1347.5-1145, one of the most luminous galaxy clusters at X-ray wavelengths. We show that evidence from strong lensing alone, based on published Very Large Telescope (VLT) and new Hubble Space Telescope (HST) data, strongly argues in favour of a complex structure. The analysis takes int…
Near-infrared imaging polarimetry of young stellar objects in ρ Ophiuchi
Gledhill, T. M.; Lucas, P. W.; Beckford, A. F. +1 more
The results of a near-infrared (J H K LP) imaging linear polarimetry survey of 20 young stellar objects (YSOs) in ρ Ophiuchi are presented. The majority of the sources are unresolved, with K-band polarizations, PK < 6 per cent. Several objects are associated with extended reflection nebulae. These objects have centrosymmet…
Inverse Compton emission from the lobes of 3C353
Hardcastle, M. J.; Croston, J. H.; Perley, R. A. +2 more
X-ray emission due to inverse Compton scattering of microwave background photons by electrons in the lobes of powerful radio galaxies has now been seen in a large number of objects. Combining an inverse Compton model for the lobe X-ray emission with information obtained from radio synchrotron emission provides a method of constraining the electron…
A search for the most massive galaxies - III. Global and central structure
Nichol, R. C.; Bernardi, M.; Hyde, J. B. +1 more
We used the Advanced Camera for Surveys onboard the Hubble Space Telescope to obtain high-resolution i-band images of the centres of 23 single galaxies, which were selected because they have Sloan Digital Sky Survey (SDSS) velocity dispersions larger than 350kms-1. The surface brightness profiles of the most luminous of these objects (M…
Cluster AgeS Experiment (CASE): deficiency of observed dwarf novae in globular clusters
Pietrukowicz, P.; Thompson, I. B.; Schwarzenberg-Czerny, A. +4 more
We present the results of a search for dwarf novae (DNe) in globular clusters (GCs). It is based on the largest available homogeneous sample of observations, in terms of the time-span, number of observations and number of clusters. It includes 16 Galactic GCs and yielded two new certain DNe: M55-CV1 and M22-CV2. All previously known systems locate…
The corona and upper transition region of epsilon Eridani
Ness, J. -U.; Jordan, C.
We present analyses of observations of epsilon Eridani (K2 V) made with the Low Energy Transmission Grating Spectrometer onboard Chandra and the Extreme Ultraviolet Explorer, supplemented by observations made with the Space Telescope Imaging Spectrograph, the Far Ultraviolet Spectroscopic Explorer and the Reflection Grating Spectrometer onboard XM…
Keck spectroscopy of globular clusters in the spiral galaxy NGC 2683
Forbes, Duncan A.; Brodie, Jean P.; Strader, Jay +1 more
We analyse Keck spectra of 24 candidate globular clusters (GCs) associated with the spiral galaxy NGC 2683. We identify 19 bona fide GCs based on their recession velocities, of which 15 were suitable for stellar population analysis. Age and metallicity determinations reveal old ages in 14 out of 15 GCs. These old GCs exhibit age and metallicity di…