Search Publications
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…
A broad-band spectral analysis of eight radio-loud type 1 active galactic nuclei selected in the hard X-ray band
de Rosa, A.; Bird, A. J.; Fiocchi, M. +6 more
Starting from a complete sample of type 1 active galactic nuclei (AGN) observed by INTEGRAL in the 20-40 keV band, we have selected a set of eight AGN which can be classified as radio-loud objects according to their 1.4 GHz power density, radio-to-hard X-ray flux density ratio and radio morphology. The sample contains six broad-line radio Galaxies…
Limits on the X-ray and optical luminosity of the progenitor of the Type Ia supernova 2007sr
Bassa, Cees; Nelemans, Gijs; Voss, Rasmus +1 more
We present Hubble Space Telescope (HST)/Wide Field Planetary Camera 2 (WFPC2), Galaxy Evolution Explorer (GALEX) and Chandra observations of the position of the Type Ia supernova 2007sr in the Antennae galaxy, taken before the explosion. No source is found in any of the observations, allowing us to put interesting constraints on the progenitor lum…
[OIII] emitters in the field of the MRC0316-257 protocluster
Pentericci, L.; Rosati, P.; Stanford, S. A. +12 more
Venemans et al. found evidence for an overdensity of Lyα emission-line galaxies associated with the radio galaxy MRC0316-257 at z = 3.13 indicating the presence of a massive protocluster. Here, we present the results of a search for additional star-forming galaxies and active galactic nucleus (AGN) within the protocluster. Narrow-band infrared ima…